Newpublications
NMBIVIMR
*ScenicTrip 8-Mosaic of New Mexico's scenery,
rocks, and history, by P. W. Christiansenand F.
E. Kottlowski,reprinted1982from 1972edition,
170p., 64 illustrations and maps, 6 color photos
$4.00
*ScenicTrip 13-Espafrola-Chama-Taos-A climb
through time, by W. R. Muehlbergerand Sally
Muehlberger, 1982, 97 p., 69 illustrations and
maps, 16 color photos. This guidebook was
written for either one long trip or two shorter
trips beginning in historic Santa Fe, the capital
of New Mexico. At Espafrola,the traveler can
choose to take a longer loop through Abiquiu
and Chama or a shorter loop through Ojo Caliente and Tres Piedras. North of Santa Fe to
Abiquiu, the route parallelsmagnificent cliffs of
yellow, white, and red sandstoneand gypsum.
The Ghost Ranch Visitor Center and Echo Amphitheater are recommended stops. El Vado
Lake State Park and Heron Lake State Park are
only a short drive west of the tour route at
Tierra Amarilla. Chama is the northernmost
town on the tour and a point of departure for
the Cumbres and Toltec Scenic Railroad. At
Tierra Amarilla, the road log turns east and
crossesthe TusasMountains,The route reenters
Carson National Forest and continuessoutheast
to Taos, at the base of the Sangre de Cristo
Mountains. The final leg of this loop follows the
Rio Grandesouthand returnsto Espaflola. $4.50
*Circular l75-Western extent of Ogallala Formation in New Mexico, by John C. Frye, A. Byron
Leonard,and H. D. Glass,1982,4l p. This study
definesthe westernlimits of the Ogallala Formation (upper Tertiary) west of the PecosRiver and
documentsthe late Cenozoic geology of the region, including fragmentary deposits of early
Pleistoceneageand molluscanfaunasof Wisconsinan and Holocene age. Included are l0 figures
and an appendixcontainingclay-mineralanalyses
and measuredstratigraphicsections.
$6.00
"Circular lE2-Industrial rocks and mineralsof the
Southwest,by G. S. Austin, compiler,1982,lll
p. On May 13-15,1981,in Albuquerque,New
Mexico, the lTth Annual Forum on the Ceology
of Industrial Minerals washeld. This volumecontains 18 expandedpapersfrom the Forum, along
with 2 abstractsof papersgiven at the Forum but
not presentedfor publication. In addition to technical paperson the major industrial minerals of
New Mexico and adjoining states, the circular
containsarticleson potashin Libya and perlite in
El Salvador.
$13.00
*Gcologic Map S2-Geology of Florida Gap quadrangle, Luna County, New Mexico, by Russell
E. Clemons, 1982, I sheet with text. Florida
Gap quadrangleis in east-centralLuna County,
approximately 6 mi east-southeastof Deming.
The quadranglecovers the Lewis Flats area of
the Mimbres Basin, Rock Hound State Park,
and Florida Gap which separates the Little
Florida Mountains from the Florida Mountains.
This map is the first phase of a comprehensive
geologic and mineral-resourceinvestigation of
the Florida Mountains; other quadranglesto be
mapped for this investigation will be Capitol
Dome,SouthPeak,and Gym Peak.
$3.50
*Pricelist l6-Publications availablefrom the New
Mexico Bureau of Mines and Mineral Resources,
March 1982
FREE
46
August1982
New Mexico Geology
*Open-file List l-Open-file reports availablefrom
New Mexico Bureau of Mines and Mineral ReFREE
sources,
February1982
reports
0pen-file
NMBMMR
*13l-Water-quality data compiled for hydrogeologic study of Animas Valley, Hidalgo
County, New Mexico, by K. O'Brien and W. J.
Stone,1982,26p.,4 maps
$9.20
*l45-Stratigraphic
sequence and drilling
from Fence Lake area, by F. Campbell,
data
text,
maps
$20'00
*l55-Radioactive occurrences in veins and
igneousand metamorphic rocks of New Mexico
with annotated bibliography, by V. T.
Mclemore, 1982, 26'7p., 5 tables, 13 figs., 2
plates
$57.,tO
il5t-Geology
and geochemistry of Ordovician
carbonatite dikes in the Lemitar Mountains,
Socorro County, New Mexico, by V. T.
$25.40
Mclemore, I 12p., 3 maps
*165-Reconnaissance report Brush Heap mine,
Kingston mining district, Sierra County, New
Mexico by R. W. Evelethand R. M. North, 2l
$4'20
P'
*166-Report on the BattleshipGroup of patented
mining claims, Lordsburg mining district,
Hidalgo County, New Mexico,by R. W. Eveleth
and R. M. North, 24p.
$4.80
usGs
79-0112-Coal resourceoccurrenceand coal development potential maps of the Mule Dam quadrangle,SandovalCounty, New Mexico, by Dames
and Moore, 1982,26p., 14over-sizesheets,scale
l:24.000
79-0114-Coal resourceoccurrenceand coal development potential maps of the Pueblo Alto
Trading Post quadrangle,McKinley and Sandoval
Counties,New Mexico, by Dames and Moore,
1982,31p., l7 over-size
sheets,scalel:24,000
79-0152-Coal resourceoccurrenceand coal development potential maps of the Huerfano Trading
Post SW quadrangle,San Juan County, New
Mexico, by Damesand Moore, 1981,25 p., 13
over-sizesheets,scalel:24,000
79-0153-Coal resourceoccurrenceand coal development potential maps of the Blanco Trading
Post quadrangle,San Juan County, New Mexico,
by Damesand Moore, 1981,23 p., 9 over-size
sheets,scalel:24,000
79-0156-Coal resourceoccurrenceand coal development potential maps of the Pueblo Bonito
quadrangle, San Juan and McKinley Counties,
New Mexico,by Damesand Moore, 1982,19p., 3
over-sizesheets,scale1:24,000
79-015t-Coal resourceoccurrenceand coal development potential maps of the Deer Mesa quadrangle,SandovalCounty, New Mexico, by Dames
and Moore, 1981,26p., I I over-sizesheets,scale
1:24,000
79-0161-Coal resourceoccurrenceand coal development potential maps of the Ojo Encino Mesa
quadrangle, McKinley and Sandoval Counties,
New Mexico,by Damesand Moore, 1982,30 p.,
12over-sizesheets,scalel:24,000
7F0601-Coal resourceoccurrenceand coal development potential maps of the Bisti Trading Post
quadrangle,San Juan County, New Mexico, by
Dames and Moore, 1982, 21 p., 12 over-size
sheets,scalel:?A,0N
79-M02-Coal resourceoccurrenceand coal development potential maps of the Alamo Mesa West
quadrangle,San Juan County, New Mexico, by
Dames and Moore, 1982, 34 p., 20 over-size
sheets,scalel:24,N0
79-0604-Coal resourceoccurrenceand coal development potential maps of the Pillar 3 NE quadrangle,SanJuan County, New Mexico, by Dames
and Moore, 1982,24p., 8 over-sizesheets,scale
l:24,000
7F0605-coal resourceoccurrenceand coal development potential mapsof the Tanner Lake quadrangle,SanJuan County, New Mexico, by Dames
sheets,scale
and Moore, 1982,35 p., 25 over-size
l:24,0N
79-|d6l2l-Coal resourceoccurrenceand coal development potential maps of the SW quarter of the
Nageezi l5-min quadrangle, San Juan and Rio
Arriba Counties, New Mexico, by Dames and
Moore,1981, l8 p.,9 over-sizesheets,scale
l:24,0N
19-079t-Coal resoutceoccurrenceand coal development potential maps of the Bloomfield NW
quadrangle,San Juan County, New Mexico, by
Dames and Moore, 1981, 2l p., l'1 over-size
sheets,scalel:24,000
19-ll14-Coal resourceoccurrenceand coal developmentpotential maps of the YoungsLake quadrangle,SanJuan County, New Mexico, by Dames
sheets,scale
and Moore, 1981,25 p., 13over-size
l:24,N0
E1-011?-Seismicity near Albuquerque, New Mexico, 197G1978,by L. H. Jakshaand JerryLocke,
1 9 8 1l,8 p .
81-0161-Fission-trackagesof air-fall iuffs in Miocene sedimentaryrocks of the Espafrola Basin,
SantaFe County, New Mexico, by G. A. Izett and
C. W. Naeser,1981,l0 P.
tl-0l?2-Geophysical log suitefrom drill holesNoI and 2, Mariano Lake-Lake Valley drilling project, McKinleyCounty,New Mexico, 1981,8 p" 7
over-sizesheets
resources of the Rincon and
81-047-water
Mesilla Valleysand adjacentareas,New Mexico,
by C. A. Wilson,R. R. White, B. R. Orr, and R.
G. Roybal,1981,47 p.
t1-0921-Annual water resourcesreview, White
SandsMissileRange,New Mexico,1980,by R. R.
Cruz, 198I , 32p.
E1-1071-Summary of basin and flood characteristics for unregulatedbasinsin New Mexico, by R.
P. Thomasand April Dunne, l98l' 243p.
descriptions of cutting samtl-l20l-Lithologic
ples, Mariano Lake-Lake Valley drilling project,
McKinley County, New Mexico, holes no. 9 and
10, by A. C. Huffman, Jr., D. J. Hammond,R.
F. Dubiel, D. S. Mruk, and P. L. Hansley,1981,
3l p.
tl-12O2-Lithologic descriptions,core and cutting
samples,Mariano Lake-Lake Valleydrilling project, McKinley County, New Mexico, hole no. 3,
by A. C. Huffman, Jr., A. R. Kirk, D. J. Hammond, R. S. Zech,K. J. Franczyk,B. A. SteeleMallory, L. C. Cundersen,P. G. Sikkink, S. M.
Condon, D. S. Mruk, M. Moore, L. A. Indelicato,and P. Hildebrandt,1981,33p.
Abstracts
PnutulNany
REpoRT oN sEDIMENToLocy
AND GAS pRoDUCTToN oF TrGHT Aeo Fon_
MATIoN SANDSToNES, Cneves
CouNry.
NEwMExrco
by R. F. Broadhead, Petroleum Geologist, New
Mexico Bureau of Mines and Mineral Resources
Red bed sandstoneslocated on the northwest shelf
of the Delaware Basin are tentatively correlated with
the Abo Formation (Permian) and are currently the
most sought after targets of natural-gas drilling in
southeast New Mexico. The Federal Energy Regulatory Commission has approved a tight gas-sanddesignation for the Abo. Because of this designation,
gas produced from the Abo red beds can be sold for
as much as $4.92 per thousand ft, ($5.15 per thous a n d f t l a s o f J u n e 1 9 8 2 ) ,5 2 . 1 1 ( $ 2 . 3 4 - J u n e 1 9 8 2 )
more than the regulated ceiling price for gas produced from formations not designated as tight. More
than 250 wells have been completed as Abo gas producers since the initial discovery in l9'Ij . production
is currently confined to an area of approximately
700 mi':in northern Chaves County. Severalwildcats
drilled to the west in Lincoln County and to the
north in DeBaca and Guadalupe Counties have encountered promising shows of gas in the Abo. The
Abo is composed predominantly of red mudstones
and very-fine-grained arkosic sandstones. To the
west of the producing area on the pedernal uplift,
the Abo unconformably onlaps Precambrian basement rocks. Elsewhere, the Abo conformably overlies marine limestones and mudstones of the Hueco
Formation (Permian). The Abo is conformably
overlain by the marine anhydrites, dolostones, and
fine-grained sandstonesof the yeso Formation (perm i a n ) . S e d i m e n t o l o g i cs t u d y i n d i c a t e sr h a t t h e A b o
was deposited as a fluvial delta which prograded
southward over a marine shelf. The lower part of the
Abo was deposited as marine delta-front muds and
sands; the upper part was deposited in the nonmarine portion of the delta. Gas is produced mostly
from nonmarine, lenticular sandstones.Becausethe
nonmarine facies extends for almost 100 mi to the
north, the area potentially underlain by similar Abo
reservoirs is at least five times greater than that
which is currently productive.
The above abstract is of an article appearing in the
Annual Report July I , I 980, to June 30. I 9g I . of the
New Mexico Bureau of Mines and Mineral Re_
sources. Other articles included in the report avail_
able for $2.00 are ones on an Upper Cretaceous
guide fossil, reminiscencesof a former Bureau direc_
tor, uranium severance taxes, coal-resources and
paleontology workshop, and mineral and fuel pro_
duction for 1980.
Plnte-rector.rtcs MoDEL non pnornnozorc coNTI_
NENTALAccRETloNlN THEsourHwEsrERNUNrrno
Srerrs, by K. C. Condie, 1982, Geology, v. 10,
no.1,p.37-42
MineralNotes
The U.S. Bureauof Land Managementreturned oil and gasindustryproduced$365.4million. Non$128.8million to New Mexico during fiscal year tax state income, including leaseand bonus payl98l (October1980-September
l98l) for the Stare's ments,royalties,and earningsfrom investmentof
5090 shareof paymentsto the BLM from mineral the State(Land) PermanentFund were$610.5milroyalties,rentals,and fees.New Mexicoreceivedthe lion. The (Land) PermanentFund totaled almost
Iargestpayment for a state; Wyoming was second $1.3billion on 3l December1981.Interestis usedby
with $120.9million, out of a total of $482.7million the State EducationalSystemfor capital expendireturnedto the states.For the first half of fiscal year tures.
1982(October l98l-March 1982),the BLM paid
The state severancetax PermanentFund totaled
$79.4million, an increasefrom the $55.8 million $602million on 3l December1981,beingincreased
paidin March 1981.
by $72.7million in the last six monthsof 1981.InCompaniespaid 92.79million for coal leaseson terestis usedto pay for bonds,most of which are for
19,116acresof State Trust Lands in September statebuildings.
1981.Most of the leases,which are in McKinley,
With the stoppageof waste-strippingoperations
Catron,and CibolaCounties,wereobtainedby Salt at Kennecott'sChinominesat theendof May, largeRiverAgriculturalImprovementand PowerDistrict scalemining ceasedin Crant County, awaiting imof Phoenixand SantaFe Mining Companyof Albu- provementin the priceof copper.Essentiallyall of
querque.
the mining-relatedemployeesof Chino mines,the
The U.S. Departmentof Energy reported(May Tyrone mine of PhelpsDodge,and SharonSteel's
1982)that uraniumproductionand drilling for l98l undergroundand small open-pit copper mines were
decreasedcomparedwith 1980.Ore processedin laid off. Minor repairsare beingmadeon two conNew Mexico was 5.4 million tons (total U.S., 14.5 centratorsat SharonSteel,and Chino is making mamillion tons) containing 6,510 tons (total U.S., jor repairson one of the furnacesat the Hurley
16,690tons)U,Or. This resultedin a concentrate
of smelter.Chino is alsonearingcompletionof the first
6,210tons(totalU.S., 19,2/10
tons)U,05. Drilling in sectionof its new $280million concentrator.This
New Mexico for uraniumdroppedfrom 4.5 million concentratorwill be able to handle75.000tons of
ft (U.S.,27.9million ft) in 1980to 1.5 million ft oreperday.
(U.S.,13.0millionft) in 1981.
The CopperFlat open-pitmine of QuintanaMinStatetaxeson all mineralsare a major part of the eralsCorporationand Philbro Mineral Enterprises
stategovernment's
revenues.In fiscalyear l98G-81 Inc. beganproductionin the earlypart of 1982.The
(July 1980-Junel98l), taxesand royaltiesfrom the porphyry copperdepositis just northeastof Hillsoil and gasindustry were9494million, alongwith an boro and will havean estimatedannualproduction
additional$130million from metallicmineralsand of 40 million lbs of copper,I million lbs of molybindustrialrocksand minerals.
denum,12,000oz of gold, and 350,000oz of silver.
On the surface,the orebodyis 600 ft by l,zl00 fr bur
ENERGY COSTS_MARCH 1982 (SOCIETY OF
enlarges150 ft below the surface and minable ore
PETROLEUM
ENCINEERS).
$IOOWOULDBUY
continuesto 700 ft. This is an undergroundmine.
Cost per million
The gradeof the copperis about0.M0/ofor the cutBtu
off of .2590;55 to 60 million tons of ore are avail3.8 tonsof bituminouscoal
$ 1.00
able.Expectedlife of themineis l5 yrs.
25.5Mcf of naturalgas
3.84
Exxon Mineralsannouncedin March 1982that it
3.6bblsof crudeoil
4.84
I 14 5 gallonsof dieselfuel
had reachedan agreementwith Boliden Minerals,
6.33
102.2gallonsof heatingoil
/.u)
whoseparent companyis a Swedishmining firm,
81.9gallonsof gasoline
9.17
wherebyBoliden will take over explorationand deI,866kwh of electricity
15.71
velopmentof Exxon'sPinosAltos propertynearSila cord of wood
35?.00
ver City. Boliden will conduct additional surface
The New Mexico Oit ConservationDivision of diamonddrillingand couldbeginundergroundwork
NMEMD reportedthat crude oil production for the late in 1982.ShouldBolidendecideto go into profirst third of 1982 (January through April) was ductionwith the property,that companywouldhave
23,579,206
bbls,down from24,123,039
full ownership;Exxon would receivea royalty from
bblsin l98l
(decrease
of 2.3a/o)and naturalgasproductionwas theproduction.
3'19,587,362
Mcf, down from 385,273,810
U.S. Departmentof Energyreported(May 1982)
Mcf in
I 98I (decrease
of I .59o).
that New Mexico's $50/lb. U,O, reserves,as of I
Crude oil production for calendar l98l
January 1982, were 163 million tons of ore. at
(NMOCD) was72,155,017
bbls (down 4.20t/ofrom 0.1590grade,giving 243,000tons of U,Or. This is
1980),worth an estimated$2.47 billion. National 419oof total U.S. reserves.
gas production was 2,415,032,759Mcf (down
Desi Apodaca of Socorro and Carlsbad was apl.2l9o) valuedat$2.42billion. The New MexicoOil pointed State Mine Inspectorby Governor Bruce
and GasAssociationestimatedtotal l98l staterev- King in May. Part of the dutiesof the SMI is to colenuesfrom oil and gas activitiesin New Mexicoat lect production data and other statisticsfrom the
$975.9million. The six taxesdirectlyimposedon the miningindustryin NewMexico.
-F.
TsE Uppen CRETAcEousBEARTooTHSnNpsroxE or
SOUTHWESTERN
NEW MEXICG_A TRANSCRESSIVE
DELTAIccoMpLEx oN StLIctFIEDpALEoKARST,
bv fL
S. Chafetz, March 1982, Journal of Sedimeniarv
P e t r o l o g y ,v . 5 2 , n o . l , p . 1 5 7 - 1 6 9 ,l 6 f i g s .
AN IRRIDIUMABUNDANCE
ANoMALYAT THE PALYNo.
LoclcAL CnemcEous-TERTIARy BouNDARy lN
NoRTHERN
Nsw Mexrco, by C. J. Orth, J.S. Gil_
more, J. D. Knight, C. L. pillmore, R. H.
Tschudy, and J. E. Fassett, 1982, Science, v. 214,
no. 4527, p. I ,341
New Mexico Geology
August1982
E, Kottlowski
leallocalitY
LateGretaceous
Palarito fault zone
(continued from
APPENDIX
References
Bailey,R. A., Smith, R. L., and Ross,C. S., 1969,Stratigraphic nomenclatureof volcanic rocks in the Jemez
Mountains, New Mexico: U.S. GeologicalSurvey,Bull.
1274-P,p.l-19
Cordell, L., 1979,Gravimetric expressionof graben faulting in Santa Fe country and the Espaflola Basin, New
Mexico: New Mexico Ceological Society, Guidebook
30th field conference,p. 59-64
Dalrymple,G. B., Cox, A., Doell, R. R., and Gromme,C.
S., 1967, Pliocene geomagneticpolarity epochs:Earth
and PlanetaryScienceLetters,v. 2, p. 163-173
Doell, R. R., Dalrymple,G. B., Smith, R. L., and Bailey,
R. A., 1968, Paleomagnetism,potassium-argonages,
and geology of rhyolites and associatedrocks of the
Valles caldera, New Mexico: Geological Society of
America,Mem. ll6, p.211-248
Galusha,T., and Blick, J. C., 1971,Stratigraphyof the
SantaFe Group, New Mexico: AmericanMuseumof Natural History,Bull., v. 144,art. I, 128p.
Golombek,M. P., 1981,Geometryand rate of extension
across the Pajarito fault zone, Espanola Basin, Rio
Grande rift, northern New Mexico: Geology, v. 9, p.
2l-24
-,
1982,Geology,structure,and tectonicsof the Pajarito fault zone in the EspafiolaBasin of the Rio Grande
rift, New Mexico: GeologicalSocietyof America, Bull.,
ln revlew
Criggs, R. L,, 196/' Geology and ground water resources
of the Los Alamos area, New Mexico: U.S. Geological
Paper1753,107p.
Survey,Water-supply
Jiracek, G. R., 1974, Geophysicalstudies in the Jemez
Mountains region, New Mexico: New Mexico Geological
Society,Guidebook25th field conference,p. 137-144
Kelley, V. C., 1979, Tectonics, middle Rio Grande rift,
New Mexico, iz Rio Grande rift-tectonics and magmatism, R. E. Riecker,ed.: Washington,D.C., American
GeophysicalUnion, p. 57-70
Manley, K., 1979,Stratigraphyand structureof the Espafiola Basin, Rio Granderift, New Mexico, iu Rio Grande
rift-tectonics and magmatism, R. E. Riecker, ed.:
Washington,D.C., American GeophysicalUnion, p.
7l-86
Reilinger,R. 8,, and York, J. 8., 1979,Relativecrustal
subsidencefrom levelingdata in a seismicallyactivepart
of the Rio Grande rift, New Mexico: Geology, v. 7, p.
l 39-143
Smith, R. L., Bailey,R. A., and Ross,C. S., 1970,Geologic map of the JemezMountains, New Mexico: U.S.
GeologicalSurvey,Misc. Inv. Map I-571
Stearns,C. 8., 1943, The Galisteo Formation of northcentralNew Mexico:Journalof Geology,v. 51, p. 301-
3r9
Unil
No.
(continuedfromp.45)
p. 4I)
o
A bontinuedl
Totrl thickness-16.t4 m (55.9f0
Unit
No.
Description
0 1 0 white sandstone,medium-grained;
with large plant fragments up to 5
cm': well induratedand forms characteristic popcorn surface texture
upon weathering;somehoodoo (columnsor pinnacles)development
009 White sandstone, fine-grained;
about 590 plant debris concentrated
in laminae. Undulating bedding
finely developed; well indurated
with fine laminationsand mud partlngs
008 Dark gray-greenmudstonewith 152090 plant debris up to 3.5 cm'?;
coarsensupward
007 Gray-green mudstone with about
590 plant fragments and stems;
gradesupward into 008
006 Sandstone,white, medium-grained;
with large fragmentsof plants up to
5 cm'!;about lOqoplant content
005 M u d s t o n e , g r a y - g r e e n ; w i t h
approximately l09o carbonaceous
debris;coarsensupwardsinto 006
0& Carbonaceousmudstone,dark-gray;
up to 40qoplant debrisis up to 2 cm'
poorly sorted;coarsensupwards;becomesmuch lesscarbonaceouslaterally (about loqo)
003 Olive sandstone, medium-grained;
with some iron staining along beddingplanes;5-1090plantdebris
002 Gray siltstone;590plant debris;iron
stainingin fractures
001 White sandstone;fine-grainedlenses
of sand rich in carbonizedplant debris and silt lacking plant debris;
lensessubparallelto bedding; fines
upward into 002; much lateral variation in plant debriscontent(5-20q0)
Thickness
Gn.inches)
89
36
60
24
30
I2
28
II
25
IO
6l
24
28
lt7
I1
47
l8
30
12
APPENDIX B-MErsunso sncuon.
Unit
No,
Description
Concretion, dark-brown; siderite
with veins of barite; rare, poorly
preserved leaf impressions extend
laterally1.8m (5.9ft)
Thickness
(cm, inches)
35.6
14.2
Description
Thickness
(cn, inches)
Siltstone, gray-green; scattered
subrounded plant fragments; wellsorted,averaging5 mm (.2 inches)in
15.2
diameter
c Mudstone, gray-green; a few
scattered stem fragments; Poorly
3.E
sortedup to 3 x 5 cm (1.2x 2 inches)
D Mudstone, gray-green; occasional
horizons with leaves 3 crn (1.2
inches)in length and also horizons
of poorly sorted stemsup to 1.3 x 2
ZZ.e
cm (.5 x .8 inches)
Mudstone, gray-green; many
jumbled leaves,many of which overlap; leavessubcomplete2-5 cm (.8-2
inches)in length,small fragmentsup
to 5 mm (.2 inches)in length; poorly
sorted stem fragments l-5 cm (.4-2
inches)in lengthand up to .75 cm (.3
inches) wide; slickensidesup to 39
cm (16 inches)in length, leaveson
laminaeaveraging.3 cm (.12inches)
17.8
apart
Mudstone, gray-green; scattered
leavesfew in number: (a), lens of a) 7.6
few scatteredcompleteleavesgrades
laterally into stems and poorly
sortedsmall plant fragments,but no
leaves;stems 5-10 cm (2-4 inches)
long and up to I cm (.4 inches)wide,
fragmentsare subrounded2-.25 mm
(.08-.01 inches) in diameter; (b) b) 5.0
sameas lateral, stem-richportion of
(a), sharp contact with plant-rich
portion of (a)
G Lateral from (a) and (b) siltstone,
yellow-green;few broken plant fragments(no leaves);lens-shapedcross
section7 x 60 x 15 cm (2.8 x?A x 6
7.0
inches)
H Mudstone, gray-green; full of
overlapping complete leaves that
cover 10090of surface on laminae
about every .5 cm (.2 inches);intervening layers produce complete
7.7
leavesnot overlapping
I Mudstone, gray-green;large stems
5-10 crn (2-4 inches)long and I cm
(.4 inches) wide, also many small
stempieces,subroundedfrom 3 to E
15,2
mm (.12to .32inches)in diameter
J Grades down with less stem to
subrounded fragments less than 2
rnm (.08 inches)in diameter to un45,9
fossiliferousgray-greenmudstone
6.1
I.J
9.1
7'
3.0
2.0
2.8
3,1
3,1
r6.4
o
USPOSTAGE
PAII)
NEI\I
SOCORRO.
PIRMIINO9