.- " Geology and coal resourceso f Tejana Mesa quadrangle Gretchen H, Roybal Noventher 1982 open File Report 178 New Mexico Bureau o f Mines and Mineral Resources TABLE OF CONTENTS page Introduction 1 surface and mineralownership 1 Topography 5 Previous work 5 Scopeof 1 study 1 Structure Xgneous rocks 10 Generalstratigraphy 13 Tertiarystratigraphy 15 Cretaceousstratigraphy 18 Coal q u a l i t y 23 c,oaz resources 24 Conclusions 27 References 2Y FIGURES F i g u r ei d n d e x map of s t u d y area Figure 2a-Surfaceownershipfor Tejana Mesa quadrangle Figure2b-MlneralownershipfarTejana Mesa Quadrangle Figure 3-Cross sectionRIA' Largo Creek arear Tejana Mesa quadrangle Figure 4-Cross sectionB-R' 9 east-central portion, Tejana Mesa quadrangle il Figure 5-Generalized stratigraphic column for Tejane Mesa quadrangle 1.4 Figure 6-Analysesfor coals in the S a l t Lake field in comparison t o coals on Tejarla Mesa quadrangle 25 Figure 7 , Coal resources forII'ejana Mesa quadrangle by township and range Appendix A-Drill hole descriptions from cuttings and geophysical logs 26 lntroduction The Tejana Mesa Quemado on field. min quadrangle is northwest of 7.5 the southeastern edge of This quadrangle contains the Salt Lake coal the southeasternmost exposures of the Cretaceous coa&*bearing rocks in the Salt take field. Theareacovered Portions of TI 3 N'.t R e 16 bythis and 17 W e t and studyincludes T, 2 M e t R. 1 6 and 17 W n (Fig. 1). Access to Tejana MeSa i s limited to two quadrangle well-maintained gravel roads out of Quemado;one going north and NX-32 going northwest to Salt LaKe, The rest of the roads in the stuay area are normal ranch roads" Surface and mineral ownership Six ranchers have patented surfacerights on Mesa quadrangle, making ownership. up 38.6% ofthetotal Tejana land Federal lands make up a large Percentage, 4 2 r 8 % t of the ownership, and the state holds 18.5% of the surface rights on this quadrangle, Wineral ownership on Tejana Mesa quadrangle i s dominated the state having by federal ownership, 77,2%, Z Q , 2 % . o f the mineral rights and private minerals of the total ownership. surfaceownershipdistributionand ownership. 1 Fig. Fig. Zb with 2.6% 2a indicates ismineral . . . .. . . . .. .. . .. .. c t MSI I /A91 ' . MLI , 3 w S u r f a c ee l e v a t i o n s 7,700 f t Qeek area, Tejana approximately Mesa is a a from af Mesa T i n a j a t o 6 , 5 6 0 f t i n theLargo on t h et a p o r i e n it ne d on Tejana Hesa quadranglerange malar topagraphical feature n o r t h w e s t - s o u t h edaisrte c tci o nv e r i n g 25% of thequadrangle, Mesa Tinala i s another tOpOgraPhiC h i g h in t h e s t u d y a r e a w i t h a r e l i e f of 600 Threemajordrainagesystemsare Tejana Draw on t h e i tnh ne o r t h e a sPt o r t i o n of t h e quadrangle: streamsandare Tejana mesa, A l l of dry volcanic neck. on Mesa Tinaja and the a f theseareephemeral a greatpercentage El P o r t i c i t oa tt h es o u t h e a s t area, study soUth.east part and Largo Creek Lopez Draw in the southwestside ft. af t h e y e a r " endofTejana two high Nesa is a p o i n ttsoh e n o r t h e a s t and s a u t h of t h i s p o i n t a r e a l s o v o l c a n i c n e c k s Previous work L i t t l e previous work has beendone i n t h e s t u d y a r e a on the Cretaceous coal-bearing rocks. M*K. d e l i n e a t e tdh sea l t in a recannaissance field. A reconnaissance [rake c o afli e l d s t u d y of the Durango-Gallup coal map in t h i s a r e a f a r t h e s t a t eg e a l o g i c Shaler map was (19061 done by Dane and Bachman (1965) i n which t h e C r e t a c e o u s rOc)Es were mapped 5 RS Mesaverde Group. FosterL rocks in Catron County (1964) rlentioned the Cretaceous in his discussion of this county's stratigraphy and petroleum potential and noted the occurence o f coal in this strata. Recently the U.S. Geological Survey Hill Formation" (McLellanr and has proposed the name "Moreno othersf 1983) for the coal-bearing unitswhllch outcrop north and west o f the Tejana Mesa quadrangle, This proposed name is a result of a cooperative mapping project quadrangles north and west of the study area of eight by the W.5, Geological Survey Coal Branch and the NewPfexico Bureau . Mines and Mineral Resources outcropping in of The Cretaceous units area are equivalenttothe thestudy Morena Hill Formation, More work has been done an the Tertiary units i n area. Willard (19591 this described the Baca and Datil Formations and the basalt flowsin northern Catron County. Snyder (19713 and Johnson ( 1 9 7 8 ) both did detailed studies on the Raca Formation i n west-central New Mexico. The most and the Cretaceous recent work concerning the Baca Formation contactandits urani,um potentialhasbeendone Guilinger(/9823 which included the northeast portionof Tejana Mesa quadrangle. 6 by the Scope of study of: the 'rejana This report i s to provide a geologic map Mesa quadrangle with emphasis on the Cretaceous coal-bearing sequenceinthe area.Thisworkfurtherdelineatesthe southeastern portion of the Salt Lake coal field and extends the known coal-resource potential. o f the area south of the map'done by tbe U.S. Fence take 1:100,000 Gelogical Survey and the New Mexico Rureau o f Mnes and Nineral Resources. The report i s based on field mapping of the Tejana Hesa 7.5 min quadrangle and subsequent drilling for subsurface stratigraphic data. Coalspenetratedindrillingwere collected and tested for quality, Structure shows Structurally, the area o f Mesa Tinaja extending northeast faulting in the area towards Tejana Mesa general dip o f the and into the Largo CreeK area. An anticlinal feature degrees. in thenorthernhalf TejanaMesaextendsontothe has an east-west of Cerro Prieto 4 quadrangle. The flexure to northeast-southwesttrendand plunging to the east. The the anticline i s The rock units in the study area is to the southeast and averages 3-5 southern portion of and minor flexures general dip on the south limb degrees to the sauthwest. I is of Along the edge o f Tejana Ness are several slump blocKs of minor faulting. and areas diKe occurs on small northeast-trending A the northeast side o f Mesa Tinaja, but no major faulting occurred adjacent to this intrusion. A large faults and system o f volcanic intrusions exists along a northeast-trendinglineincluding El PorticitoandMesa Tinaja extending north to Veteado Mountain, portion of Tejana Mesa The is faultea along southeast this northeast trend. Cbross sections Two cross sections were drawn to show the structure in or areaswherecoalwasseeninoutcrop drilling in the study area. evident locations o f The the from cross sections are shown on the accompanying geologicmapI Section A-A" area of (Fig, 3 1 is the quadrangle oriented located in the Largo Creek in a northwest-southeast direction, parallel to the general structural area. At the northwest end o f the cross section the middle member o f the Moreno HiXl Formation is outcrop on the adjacent take Armija 1.5 1.5-ft dip of the coal is projected into the on nin quadrangle. The cross outcrop indicated on the geologic map. less than one degree projected from an section from the The angle of dip the northwest end of the is cross sectionr but changes tQ three degrees on the other side of the fault! indicating that some tilting i s assoclated with 8 A' SE A NW FIGURE 3 : CrossSection , A-A' 7400' Largo Creek Area Tejana Mesa Quadrangle 7200' 7000' 6800' 6600' 6400' \ I Horizontol Scale : 1"=2000' \ .i the faulting. The f a u l t is notseen on t h e surfacebecause of t h e v a l l e y f i l l b u t is t h e middle Moreno Hill Formation i no u t c r o p " t h ne o r t h w e ssti d e the fault with of i n d i c a t e d by t h e re-occurence From is a p p a r e n t l y r e s p e c t ot h es o u t h e a s ts i d e outcrop downthrown displacement with a of of 330 f t n S e c t i o n R-8'- of t h e TejanaBesa line. (Fig, 4) i s l o c a t e d on the eastern edge with two d r i l l n o l e sp r o j e c t e di n t o The cross sectiota i s of t h e area, NO faulting c r o s se c t i o Int nh, e Moreno Hill p a r a l l e l t o the g e n e r a l is e v i d e nitn two d r i l l Formatian contact is the StriKe area of the the holes! the Baca-upper intersected, Two thin c o a l s of the upper Moreno Hill Formationwerefound i n drill h o l e 216m9-1 a n do n ec o a il n Although the middle Moreno d r i l l h o l e 216-3-4, Hill Formation was n o rt e a c h e dI nt h e s e d r i l l h o l e s r t h e u p p e r member i s known t ob e a r e a ;t h e r e f o r e ,t h e s ec o a l sa r e represent Descriptions i n c l u d e di n assumed t o be not p a r t zone (Roybal, Campbell the twilight 1981) stratlgraphically a of the thick i n this of and Probably zone. coal higher c u t t i n agngs de o p n v s i claolagrse a p p e n d i x A f o rt h e s e two holes, Igneousrocks Tejana Mesa i s covered b y averages 40 f t i n thicKness. a no l i v i n e The 10 basalt flow that s o u t h e a s t e r n part o f this I 0 I 6 0- 0 id 9 I 4 I m m n , mesa is covered by a more scoriaceous part o f the flow, indicating a volcanic neck, and stands out dramatically on areal photographs because o f its red-brown color. Extending from TeSana Mesa in sec. 5, T. 2 N.t is a breccla consisting H. 16 W. of angular basaltic fragments and rounded Calcareous sandstonesof the underlying PatilGroup. The angukarity of the volcanic material indicates a closenesstothesource,Thisbrecciaiscementedby botryoidalcalcareousmaterialthathasbeenpercolated by ground water. through this detrital deposit, probably in sec. 5, Another breccia occurs coming aft of Telana Wesa T. 2 N., R. 16 W. from the area of the scoriaceous of fragments of: scoria basalt flow, This breccia consists and other lithic fragments and i s cementedtogetherby tuffaceous material. These two brecclas are concentrated at this point of the mesa and E l o w The basaltic breccia flowed further possibly was part o f in a northeast direction. from the source and a mud flow caused by tne volcanic activity. MesaTinaja a basaltflowwhich iscappedby probably of the same age as the flow on Tejana Mesa, is An older flow occurs below the cap rock on Mesa Tinaja and c a w the small Knoll south ~f vicinity o f Mesa Tinaja. several necks in the MesaTinajaaswellasasmallnortheast- trending dike appearto be olderthan the cap raclc of Tejana Mesa. a2 Small patches of in-placevolcanic Mesa T i n a j ao v e r l y sandstone of basalt southwest a g r a yt op i n k i s h - g r a yc a l c a r e o u s lithic t r a n s i t i o nzaolbneet w etehne the volcanicsedimentsandthe ridge between the two Datil BacaFormation, basalt caps a slump b l o c kl o c a t e d of A t h i ns l i v e r of on t h e n o r t h s i d e o f mesas and uncomformably the overlies a t h i n s e c t i o n o f t h e same sancfstone. Flows on Tejana o f l a tTee r t i a r y specific age has or Mesa quadrangle are r e p o r t e d t o Q u a t e r n a r y age beenassigned (Foster, be No 1964). volcanicsand to these r a d i o m e t r i c work is known t o havebeendone no on theserocks. General s t r a t i g r a p h y Eight mappable stratigraphic t h e s t u d y area r a n g i n g i n a g e The Q u a t e r n a r yu n i t sa r e coveringtheprominent The Datil in a l l u v i a l v a l l e y f i l l and valcanics mesas: Tejana Mesa, E l PartiCitO,and Group as Q u a t e r n a r y / T e r t i a r y volcanic sedimentary facies and Baca Formationsedimentary units a r e o f T e r t i a r y age, t h r e e members C , r e t a c e o u su n i t sa r et h e FOrmatiQn, F i g , 5 are exposed from Quaternary to Cretaceous. Mesa Tinajar which a r ec l a s s i f i e d age, units is a of t h e Moreno g e n e r a l i z esdt r a t i g r a p h i c for t h e s t u d y area. l.3 in the The Hill column Quaternary-Tertiary - Volcanics Datil Group BocoFormation __. Moreno Hill Formotion UpperMember Moreno Hill Formotion M i d d l e Member Moreno HillFormation LowerMember Scale FIGURE 5: GeneralizedStratigraphic Column for Tejana Mesa Ouodrongle - I:200 Tertiary StratigraPhy TheDatilvolcanicsedimentsunconfor~nablyunderlie Quaternary/TertiarY basalt flows inthe northern Portion o f The unit i s thin [20-60 the quadrangle. and has ft) in this region a gradational contact with the underlying Baca, Directly underneath the basalt flow, the Datil sediments are tuffaceous with pebbles andesite and quartzite of in the matrix, The majority o f the Datil Group in the study area i s made up of gray to pinkisb-gray, fine-grained, lithic are arenites, Predominant lithic fragments andesites, quartzites, and limestones" Grains are subangular to subrounded in the sandstone which can be highly cemented by calcareouscement or friable. %iChintheDatilunit, vertical and horizontal variation ranges from fine-grained sandstone to Lenses of pebble and Cobble-Size material in a finer grainedr sand-sized matrix. interpreted as Fence Lake Gravel disagree because (G~ilinger~l9823,but Z of the minor percentage, mostly in thin conglomeratic lenses, of cobble unit, Cobble material Lake Gravels. Thisunithasbeen is material within the entire a dominant feature of the Fence In the Fence Lake Gravels, basaitic material i s predominant which is not the c ~ s ehere. Datil sediments grade into the sedimentary sequence o f the Baca Fornaatlon. The Baca consists of a sequence of red-brown to maroon mudstones and siltstonest grayto pink- gray, arkosic sandstones, and pebble conglomerate, The base 15 o f the Baca is generally determined in the study area by at the base of erosionalcontact of conglomerate highlyrounded, quartzite Pebbles I a looselycemented and gray red:Purpler rounded lithic fragments , theCretaceous the of of underlying Cretaceous sandstones, and Pieces wood from an petrified ThecongkomerateisPoorly by cemented and thin ( 6 inches-2 ft7 and is often recognized of quartzite cobbles covering Cretaceous the lag gravel outcrops. In many areasf becausetheconglomerate is non-existent, the contact between the Cretaceous sediments and the Baca is determined by the occurence o € red-brown to In maroon mudstones, claystones, and siltstones, northeast portion o f the study area, this contact difficult to determine because partofthe Moreno can be of oxidation of the upper Formationdue Hill the to a paleosol; hpwevert the contact: can be determined by looking closly at the sandstones. The sequence part of the Baca 100 ft and o f fine-grained SedialentS in the lower Formation ranges in thickness from 6 0 is well exposed In the northeast portion of quadrangle, The mudstonest siltstones, some parallelbedding and to the and claystones show burrowingr but are generally without structure* Hithin this fine-grained sequence are thinfriablesandstones and. conglomeratesIindicating a rapid and relatively shprt-lived changein environment, The change from a low-energy fluvial environment t o one of energy indicates a time of flooding in climate, 16 high a generally dry Above this fine-grained material are several sandstones in a sequence 60-120 kt thick exposed along Tejana Mesaand the ridge east of Mesa Tinaja. to yellow-gray subangular The lowermost sand subrounded? is a to medium Coarse-grained? arkosic sandstone.. The unit lacks internal structure in the upper contains rip UP part of this clasts o f 20-40 ft sand? but the underlying mudstane at the base. AnQther sand in this sequenceof the Baca Formation is a gray subangular to subrounded, medium to coarse-grained, arbtosic sandstone, Phis sandstone shows bimodal characteristics: quartz, teldspar? and biotite grains predominantly mediurn grained, the jasper and quartzite coarsergrained. are are Calcareouscementingwithintheunit varies? from friable to well cemented. The gray sandstone? which is laterally extensive witha thickness up to 60 Et on the Tejana Mesa quadrangle? shows a fining upward sequence in a generallymassive sand unit. The presence of sandstones i s indicative of a higher energy envfronment with larger material being transported. The Unweathered state of the constitiuents and thelaclc of internal. bedding indicate a period of rapid deposition . Conformably overlying the gray# arkosic sandstone. in the northern portion of the quadrangle in Tejana Nesa and the ridge between Mesa Tinaja i s a niuch finer grained, pinkgray, lithic sandstone, This sandstone appears to be the transition zone between the Baca Formation and Datil 17 Group because o f the shift to predominantly lithic components and the highly cemented tuffaceous ( ? I nature of the unit. This sandstone is directly below the volcanic breccia and below the basalt block along the ridge from Tinaja, Outcrops Tejana Mesa to Mesa zone are indicated on of this transition the map as Td/Tb. In the southern third of Tejana Mesa? the gray, arkosic sand is overlain by another sequence of fine-grained? red- brown to maroon mudstones and siltstones. This Part of the Baca is at the most20 Et thick and represents a return to a low-energyl dry environment similar to that represented b y sediments at thebase of the Baca Formation in this area, Snyder ( 1 9 7 1 ) and Johnson (19781 indicated that source from areas for the Baca sediments the northeast to the and Zuni Upliftsl and the southwestaretheDefiance is MogollonHighland.Thisinterpretation presence o f quartziteand conglomerates. Johnson granite (1978) on based cobbles fn the the Baca postulates this area to be part of the distal-fan faciesof the BaCa Formation, Cretaceous stratigraphy The Cretaceous coal-bearing Sequence Pn the study area i s tentatively named the Moreno Hill and Geological Survey [McLellan Formation by the U.S. others? formation is divided into three mernbers: Hill, unit with a asiltstone/claystone 58 19831, The the upper Moreno fewfriable sandstones and channel sandstones; the middle Moreno Hill, a a persistent fluvial sandstone; and the lower Moreno Hill, sandstone/mudstone sequence. Maximum thickness is entire Moreno Will Formation the of The members are 920 f t . designated KNthUr Kmhm, and timhl on the accompanying geologic mag e The lower Moreno Hill Formation in the study area is a maximum of 140-160 ft thick. Uutcroes of the lower unit are predominantly channel. sands and crevasse splays that grade and mudstones. laterally into siltstones Sands are well- sorted# well-rounded, fine to medium-grained sandstones predominantly quartz in (90-95%) a siliceous of cement. Secondary minerals in the lower sandstones are weathered ieldsparsthatmake constitutents. Slight amouks o f occur but are are rare (> 0.5%). biotite and other mafics Channel deposits that are 10-25 ft thick show trough crosSbeddingr to 1 ft of o f . rock theremainingportion up The top 6 inches these sands often have iron staining, giving a characteristic iron cap on a yellow-gtay sandstone. The maturity of the constitulents o f the channel sands indicates a stream environment with a low gragient and the at some distance from the source af material. Above and below the channel sandstones and laterally adjacent to crevasse selays o f the lower Moreno Hill member are siltstones and mudstones. Several organic-rich gray, brownr andblackmudstonesoccurwithinthissequence, Brown mudstones have a large aniount 19 of coalified P'lant iragments and often are found associated with a coal These deposits are indicative needed t o produce coals. seam. of an anaerobic environment Lateral transition from crevasse and mudstones indicates a floodplain splay to siltstones environment. Coal. beds occur in this sequence. zone is within 60 Et o f unit of the Moreno set" 21, T. 3 The rabbit coal the base of the middle sandstone R. 17 N.. The rabbit zone is further north on the Cerro Prieto and The Dyke (RoybalandCampbellr1981).There approximately 20 in Hill and outcrops in the study area the recognized quadrangles coal outcrop'is and ft below the middle member has one tonstein. This seam can he traced for 114 mi before it dips into the subsurface. The coal i s inch tonstein. Below the parting, 0,9 ft tbicK above the 0.75 4 ft of shaley coal. occurs overlying another 0.75 ft seam of coal, A lower coal zane, the cerro prleto zone, in the lower. member of the Moreno Hill Formationand 150 ft below the middle member is not exposed in this area, but is probably near the surface in the northern-portion of the quadrangletbecause of the gentle southeastdip of the beds. The middle member of the Moreno Mill Formation is a medium to coarse-grained, subanglar to subroundedr fluvial sandstone. The middle unit consists of fluvial, coalescins- channel sands! predominantly of quartz C85%1 with relatively unweathered plasioclaise feldspars (15%) This grain-supported rock is poorly sorted with little or no clay 20 to silt fraction sandstone unit The middle e to predominantly massive is planar, trough-crossbedded pinkish-orange to gray sandstone that varies in thickness from 40 to ft. 60 Characteristicallythisnonfrfable sandstone contains iron concretions that vary in size from 0,s inches to 3 inches diameter and are more abundant in the upper portion of the unit, The lower contact is erosional with the lower Moreno Hill formation. The overlying sequence o f upper Noreno Hill consists of a thick silty Sandstones, siltstones, claystones and in thin coals, This sequence has greater exposure (700 Et) to thenorth thestudyareathan southeast; die of the b e d s . sand and the upper unit to thegeneral due The contact between the middle is erosional and often sand similar to the lower unit overlies a channel the mkddle unit, Predominant,ledge-formingsandstoneswithinthe upper member are concentrated within tne first hundred feet above the middle member. fine to These trough-crossbedded sandstones of medium-grained material are predominantly quartz ( 9 5 % ) with a siliceous cement, Sandstones show iron staining in t b e top 0 1 5 ft-i ft of the outcrop. Above these Channel sands, sandstones are yellow, gray siltyt and very friable. Silty to olive-gray, sandstones are subangular to Subrounded, medium to fine-grained, quartz-dominated with highly weathered feldspars going to clay. olive claystones and siltstones make Yellow, gray, and up a majority of. this upper memberr indicating a drier environment than when the 21 ~ ~ ~ ~ ~ ~ ~ ~ _ ~ ~ ~ " _ _ _ " I _ " - underlying Noreno Hill was deposited, accasionally, coals occur in this upper unit, Two In coals were penetrated drilL holes done by Mew Mexica Bureau o f Bines and Mineral Resources and one coal crops out. Because bath drill holes contact but not the middle penetrated the Baca/Moreno Hi11 Moreno Hill member, they are discussed with respect to the Drill holes Baca contact, are numbered by township range, in that section; tee, 216-3-1 sectfont and number of holes is in T. 2 W,, sec. 3 r first drill hole in that N. R. 16 section, Xn sec. R. 9, T. 2 N,, ft below the Baca contact. Moreno Hill was Penetrated 17.5 In the same drill ft coal in the upper a 2.5 16 W., holer a i . 0 Et coal was found below the base of the first coal, In sec, 3 f T. 2 W., a 1.5 ft coal 1s into a have been projected EJ.# 112 Et below the Baca contact. two drill holes a r e represented in crass section lower coal in 216-9-1 line parallel 1Qt T. 3 M.8 and t o strike. The 216-9-1 appears lineparallelto to a seam knoll The coal is 1,s ft thick nere, R, 17 W. be prajected to the SQUthr This coal is projected into cross sectionA-A' equivalent to sandstane present in 216*3*lr but because of the faulting cannot is a These BmB' The coal outcrop in the uppermember occurs in a in 6ec. R, 16 and the coal i n 216-3-1 appear to be the same coal zone, The larger Coal in be channeled out by a ft 52.5 dip, Thiscoalseamwould in thetwilight 22 wnich zone which be is approximately 50-100 ftabovethemiddle lnenlber ofthe Moreno Hill and consistsof a-3 coaI Sedms(ROyba1, Campbell, 19811 recognized to the north of this study area. Coal quality Coal-quality analyses for Btu, ashr and moisture were run on two coals in drill holes 216-9”1 and 216-3-1, The range as analyses tor coals in analyses are in the same other areas of the Salt Lake coal field r but differences do exist. Btu values for E t 2 9 4 Btu/lbl the two are at the upper and lower limits of the standard-deviation range area (9,660 Btu/lb coals are 7.3% Ash and 10.3% +/- these Moisture content of compared to the average moisture of other coals in the Salt Lake coal content i s average (21.8% [t/-) for other analyses in the +/-1,516Ir content of 4,9% +/-3.1 field. coals (llr306 B‘cu/lband lower (11.6% 11.0%) and 17.48) than the other analyses and i s at the for low end o f the standard deviation range for ash. Using the average sulfur content of Salt Lake coalst the rank, based on mineral matter free Btu/lbris high volatile C bituminous and subbituminous C respectively for the coals analyzed from Tejana PIesa. The overall environment of deRositSon f o r the upper Moreno Hill 1s drier than the lower member? therefore the organlc sulfur content should be lower in the upper member, raisingthe MMF Btu. Sulfur of bacterial nature may increase the sulfur content 23 a detrital or of the coa2sl but analyses are needed to determine if these factors are significant.Fig. 6 for thedrillhole shows data samples on Tejana Hesa and the average far coals in the Salt take fielti, A comparison of coals from above the middle member o f the Moreno Bill is not available because o f a lack of data from this zone north of Tejana Mesa quadrangle, Coal resources Coal resources are based on information acquired during the course of this project on both subsurface and outcrop data. Average thicicness of upper bloreno Hill Formation coals i s 1.8 ftr with a standard deviation o f t/-Os5'ft. rhese coals are thinner seams than those found just north of tne Tejana Mesa quadrangle, The thicker coals are in the lower member of and havegreater theMorenoHillFormation \ and economicpotential.Heasured indicatedcoal-resource figures are based on 1800 tons/acre ft for bituminaus coals and were figured according to Geological Survey Prof e strippable-coal resources 34.7 million tonsl 22.5 2O:l U.S. Bureau o f Paper for Mines-U,S. 1450-8, Total Tejana Mesa quadrangle are million tons of which are within a stripping ratio. Fig. 7 shows a breakdown o f the coal resources by township and range. Areas o f coal potential indicated by outcrop and drilling data are concentrated in thethreemajordrainageareas of thequadrangle.The autcrol, of coal under the middle Moreno Hill sandstone in 24 Fig. 6. Analyses f o r coalsn i t h e S a l t Lake field in comparison to coals on 'xejana Mesa quadrangle Analysis for Salt Lake field Analysis for ~ e j a n a~ e s aquadrangle 216-3-1 1 4 Q - I 4 5 ft Prox, moisture P ~ O X . ash 216-9-1 7.3 11.6 304.5 f t P t o x . moisture 10n3 ProxI ash 17.4 Btu/lb 11306 Btu/lb M M F BtU/lb 12945 PJMF Rtu/lb 25 8294 10109 7. PigI Cwal resourcesforTejana Mesa quadrangle by township and range (in millions of t o n s ) Depth category Tornship-Range Peasured Indicated Total 0-150 ft T2N R16W 0.77 6.17 6.94 0-150 Et T2NR17k 0.68 5.42 6.11 150-250 E t T2N R17W 0.34 2.71 3.05 0-150 f C T3N 16,29 R17# 2.27 T o t a l 0-150 ft: 31.61 million Total 150-250 f t : 3.05 Total stripping tons m i l l i otno n s at 2 Q : i ratio: 22.45 18.56 19.75 Heasured Indicated Total 2.70 26 " 1 1 " " Sec. 21, T. 3 N. R. 11 W. and the general geology on the northwest corner of the quadrangle indicate the possibility that thicker Coals of the lower member are close to the surface in this area andon Lake Arniijo, the quadrangle west o f Tejana Mesa. Conclusions Tejana Mesa quadrangle has Moreno a large amount FormationCretaceousoverlain Hi11 sediments and of exposed by Tertiary volcanicsedimentsthatarecappedby volcanicsofQuaternaryITertiaryage. Moreno HillOutcrops is The extent af the furthertothesoutheastthan of the exposed Cretaceous rocks previously thought;. Most are part o f the upper member of the Noreno Hill Formation, a sequence of (1.5 siltstones, silty sandstones, ftlcoals. Thesecoalsbecause and a few thin af theirthinness, probably do nQt have economic siqnificance at this time, The fact that the upper member obstacle in considering is qulte thick also becomes an the lower member coalsI Possibly that the Upper Moreno Hill i s not as thick on the south side o f the northeast-trending fault zone;if this lower Moreno Hill coals would b e within the so, the 250 ft o f the is surface. More drilLing is needed t o determine the validity gf this assumptionr The presence o f several volcanic necks apparently different ages and faulting in this quadrangle may 21 of complicate the s t r u c t u r e more than what i s s e e ni no u t c r w . More d r i l l i n g on both sides ofthe the extent of the faulting fault area would i n d i c a t e and coal-bearing Moreno Hill Formatian, 28 its effect on the REFERENCES Geologic map of New 14exico: Bachman, G,a.,1965, Geol. Surveyr 1:50~,000t 2 sheets. Foster, R.W.,1964, Stratigraphicandpetroleum possi~ilities of Catron County, New Hexlco: New Mexico Bureau of Nines and MineralResources, Bull. 85, 5 1 P, GuilingerrD.R.r1982r Geolo4y and uranium potential of Tejana Mesa-Wubbell Draw area,Catron County, New Mexico: New MexicoBureau ofMines, open file report,in progress. johnson, B.D.r1978r Geneticstratigraphy and provenance o f the Baca Formation, New y;iexico, and the Eager Formation, Arizonat Univ. of Texas at Austin, unpublished thesis, 150 B. McLellant M., Haschke, I,., RobinSon, L., Carter, M.D., and Medlln, A,, 1983, Middle Turooian and younger Cretaceous rocks, northern Salt lakecoal. field# Cibola and Catron Counties, New Mexicar in Contributions to midCretaceous paleontology and stratigraphy of New NexicoPart XI, S.P, Iioakr compiler: New Mexico Bureau o f Mines, Circular 185, in press. and CampbellrF.W.,198Ir Stratigraphic Sequence Roybal, G.H., and drilling data from the Fence Lakearea: New Mexico Bureau of Mines and Mineral Resources, OpenFile 145, 28 P * 11 plates. Shaler, h.K.,1906, A reconnaissance survey of the Western part of the ourango-Gallup caal fieldof Colorado and N e w Mexico: 0.6, Geal. Surveyr Bull. 3 1 6 r P. 376-426 Snyderr~.0,,i9~l,Stratigraphic analysisof the Baca Formation, west-central New Elexfco: Univ. of New Mexicor Unpublished PhD. dissertation, 1 5 8 P. u.S, Bureau of Mines and u.S. GeQlOgiCal Surve~,1976~Coal resource calculation systemof the U,S, Bureau of Wines and U,S. Geological Survey: U.S. Geol. Survey Bull, 1450-8, 7 Pr Willard,M,E,,1959, Tertiary stratigraphy of northern Catron Countyl New Mexico, in Mew Mexico Geol. Society, Guidebookr Tenth field conference: Nest-Central Rlew Mexico, P. 92-99 Dane, C.B., U.S. 29 Appendix A: Drill. Hole Descriptions from CcUttfngs and Geophysical bogs Hole no. 216-3-1 Township 2N1 Range 16W. Sec.3 Location 2600 E. o f W, line Elevation 7030 ft 4750 of S I line Hineral Ownership: Federal Total Depth 263ft County: Catron Quadrangle: Tejana Mesa Hater: Water well Data geophysical logs- gamma(api, CPSI, density (cjm/cc)r resistivity (ohm/m) r caliper? Porosity,S.P. (rnvlt neutron? resistance (ohms) N. Formation Baca Formation Depth 010-7.5 7.5-30.0 Moreno Hill Fm upper member I Descripti ft Sandy siltstone, gray brown? coarse-medium grainedrcal* careous cement. ft Silty sandstonet brown,very fine-very coarse? subrounded very poorly sorted. 30,0-35.0 ft Sandy siltstonetyellow brown, very coarse-coarse grained, calcareous cement, 35,041.5 Sandstone, ft yellow gray,fine sand-silt, angular, calcareous cementtminor coal. 41.5-45.5 Et 45.5-50.5 ft Sandy siltstoneryellow gray, fine grained, iron staining. 50.5154.0 ft 54.0-60.0 ft Sandy siltstone, light gray, light gray, coarse-medium grained, minor coal fragments, 60.0-66.5 ft Silty sandstone, yellow brown, coarse sand-silt,very poorly sorted, subangular, Sixty sandstonetyellow gray, fine sand=siltlmoderate sortingtangulartcalcareous cement, Siltstone? light gray? micaceous. 66.5-69.5 ft Claystone, light grayg interbedded mudstone, iron staining. Silty sandstonet gray, very coarse-coarse sand, very poorly sorted, 79.0-87.5 ft Claystone, olive gray, minute c o a l fragments. 87.5-94.Q ft Mudstone, light olive gray coal fragments, ft siltstone, olive gray, coal fragments. 115.5-121. ft Siltstone, medium liqht gray. 121.0-1361 ft Mudstone, light olive gray, sandy from 122.5-123.5 ft coai fragments. 136*0"l40. ft Silty sandstone, light gray, fine sand-silt, subangular. 140.0-142. ft Mudstone, olive gray, coal fragn~ents. 162,-143,5 ft Coal 143.5-152s Et MUdstaner olive w a y f coal fragments. 152.0-1691 ft Mudstoner light g r a y r coal fragments. 169,0-176. ft siltstone, olive gray, coal fragments, 176.0-iR7. ft Silty sandstone, light olive gray, fine sand-silt, subangUlar, poorly sorted, mica. 187.-189.5 ft sandstone, light olive gray, fine sand-silt, angular, p.aorly sorted, 94.0 115.5 sandstone, light gray, medium sand-silt, subangular, very poorly sorted. . Silty sandstone? light gray? medium Sand-Silt, subangular very poorly sorted. Sandstone, olive gray? medium sand-siltr subanglar? very poorly Sorted? mica. SiXtstone, olive gray? anguLarr coal fragments. Mudstone, olive gray? angular coal fragments. sandstone, light. grayr fine sandwsilt? subangular-subrounded? poorly sorted. Silty sandstone, light gray coarse sand-siltr subangular very poorly sorted, Mudstone, olive gray, minor coal fragments, Claystone, light olivem a y , Mudstonetlight olive gray, coal fragments. 1'D Hole no. 21619-1 Township 2N. RangeSec.9 16W. Elevation 6940 ft Location $190 E. o f W. line 2000 of S c line Mineral Ownership: Federal Cwnty: 175Depth Total Catron ft Quadrangle: Tejana nesa Water: Water well Data geophysical logs- gammatapitCPS), density 6gm/cclr resistivity (ohm/m), caliper, porosity, s.p.lmv), neutron, resistance (ohms) I J I Depth Description Formation BacaFormation 0.015.0 Silty sandstone, medium brown very coarse-coarse sand, calcareous cement. ft 5,0-10.0 Silty sandstone, medium brown coarse sand-coarse siltrsubangular, coal fragments. ft Sandstone, medium brown, very coarse-fine sand, subangular, very poorly sorted. Moreno Hill Fm upper member 14.0-17.5 ft Sandy siltstonet light olive gray, coal fragments. 17.5-24.5 ft Silty mudstone, ollve gray, coal fragments. 24.5-29.5 ft Sandy mudstone, ollve gray, coal fragments, 2915*31.5 ft Claystone, olive grayr coal fragments, 31.5-34.0 ft Coal, 34"O-34.5 f t Claystone, olive gray, coal fragments. 34.5-41.0 Mudstone, brown grayt coal fragmentst iron staining. ft Siltstone, medium gray. Silty sandstone, light gray! medium sand-medium silt,SUb49,0-52.0 ft Silty sandstone, mediumlight gray, medium sand-medium silt, subangular, cemented. silty sandstone, light gray, medium sand-medium s i l t , angular. Siltstone, light gray, coal fragments, Siltstone, light gray# micaceous, coal fragments, Clayey siltstone, rnediurn light gray, coal fragments. Siltstone, light gray. Claystone, olive gray. Coal, Sandy mudstonel light: olive gray, minor coal. Sandy siltstone, light olive gray, coal fragments. mastone, gray. Sandy slltstone. Claystone, olive gray, coal fragments. Silty sandstone, light gray, fine sand-coarse silt, subangular, moderate*poorly srtd Claystone, olive grayr Sandstone with mudstone, light gray" subangular, very poorly Claystone, olive gray. Sandy siltstone, Light olive gray, coarse sand-coarse silt subangular, very poorlysrtd. Sandy mudstone, light olive w a y , Bine-very fine sand. ft Siltysandstonel y e l l o w b r o w coarse sand-coarse silt, sub 152.0-157.5 ft Mudstone, o l i v e gray, coal fragmentsr 157q5-165.0 ft; s i l t y sandstone? light gray, very fine sand-coarse silt? subangular, moderately srtd. 153.0 155.0 TR UNITED STATES DEPARTMENT O F THE, INTERIOR GEOLOGICAL SURVEY /' 1 34" - 1 SCALE 1:24000 1 2 * * * I t .5 d u - " * 1 MILE 0 I b 0 1 COluTOUR INTERVAL 20 FEET I KlLaMeTRn 1 D TEJANA MESA, O F I78 N. MEX.