NMBGMR Open-file Map Series
OFGM 115
Last Modified 5 February 2009
Explination of Map Units
Af
Af
Artificial Fill
Tl Latite
Dikes and small sill s.
Tl
Montoya Dolomite (Ordovician)
Omc Cutter Member
Dolomi te, finely crystalline to sublith ographi c,very light gray to greenish g ray, thin to moderately thick bedded
and l ocally i rregularly bedded, in part cherty; scattered sil ty layers and pa rtings; generally weathers to smooth,
light colored surfaces, but forms brownish crusty surfaces where cherty.
QUATERNARY
Omc
Tm Monzonite Porphyry (48.8 my; Chapin, personal communi cation)
Dikes, sills, small stocks and lac coliths.
Tm
Qal Stream-Laid Alluvium
Younger, medium to coarse-g rained alluvial fan deb ris and thin de posits along p resent stream courses.
Qal
Oma Aleman Member
Dolomi te and limes tone, fine-g rained, light to medium g ray, thin to moderately thick bedded, with many
undul atory silty partings; abundant banded g ray chert in sub-pa ralled thin l ayers and thic ker globular lenses ;
forms bold outcrops and l ow clif fs with ribbed faces.
Oma
Om
Tlm
Qt
Omu Upham Dolomite
Dolomi te and limes tone, fine to moderately coarse g rained,very light to medium g ray and bluish g ray, medium
to very thick bedded ; banded che rt: sparse to moderately abunda nt in up per part; sandy dolomi te in lowest part;
locally forms rounded clif fs with su rfaces that are rough in detail .
Omu
Tlm Leucomonzonite
Small stocks and sill s.
Qt Talus and Stream-Terrace Alluvium
Older, mainly coarse-g rained fan and terrace deposits; talus deposits of various ages.
Omcc Cable Canyon Sandstone
Orthoquartzite, vit reous, fine to coarse g rained and pebbl y, and sands tone with sili ceous or calcareous cement and
numerous granules of qua rtz, chert, dolomi te; light gray to yellowish and b rownish b ray; hard and resistant but forms
low, blocky outcrops rather than conspicuous clif fs.
Omcc
Qaol Older Alluvium
Locally thick accumul ations of coarse-g rained alluvium in Cuchillo Creek and Margarita Canyon.
Qoal
Tla Latite-Andesi te Sequen ce Undifferentiated
Sheets and lenses of tuff and tuff b reccia, thin to moderately thick fl ows; local vent compl exes of tuf f, tuff breccia, and flow
rocks; lacust rine accumul ations of volcaniclastic sedime nt; dikes and small plug s.
Tla
Latite and Trachyandesi te
Porphyritic aphanitic and aphaniti c, greenish g ray to maroon and dark purplish g ray, propylitically al tered; typically
in moderately thick to thick fl ow units; forms bouldery outcrops and bold clif fs. Phenocrysts mainly albit zed plagi oclase
and ho rnblende al tered to epido te and chlo rite; rare bioti te and pyroxene; quartz and al kali felspar rest ricted to
groundmass.
Qls Landslide Deposits (Quaternary)
Mainly in domains of loose alluvial deposits and l atered pyroclastic rocks, includes some talu s.
Qls
Unconfomity
Olivine Basalt Sequen ce (4.8 my; Seager, and other s, 1984)
Tbi
Tbx
Mesa-capping remnants of flows; local vent compl exes of al tered breccia and tuf f.
Tbi
Dikes and small plug s.
Water Laid Tuff
Tuffaceous mudstone, siltstone and sands tone, greenish g ray and oli ve drab to medium b rown, thin bedded, locally
fossili ferous; represents lacust rine deposition of reworked volcanic deb ris,possibly with addition of air fall tuf f;
forms few extensive outcrops.
Sierrito Limestone
Limestone and dolomi te, fine to very fine g rained, light to medium g ray, thin to medium bedded with abunda nt
closely spa ced, crenulated lamin ations of lig ht gray chert; glauconitic and l ocally sil ty near base ; forms some l ow
cliffs with g ray to light brownish faces that appear bande d.
Cb
Unconfomity
Tp Pediment Deposits
Ridge and mesa-capping remnants of lag-g ravel and cobble cover on one- extensive aggraded su rface.
Tp
Twc Winston and Cuchillo Beds
Valley-fill conglome rate, probably equi valent to Palomas and Santa Fe bed s.
Twc
Kd Dakota Formation equi valent (?) ( Upper Cretaceous)
Interbedded o rthoquartzite, shale, limestone, and locally abunda nt conglome rate with sili ceous or calcareous cement and
closely pac ked pebbles of che rt, jasper, quartz, limestone, and sands tone (p robably all or in pa rt equi valent to Dakota Formation);
locally unde rlain by brown calcareous shal e, bluish g ray limestone, and g ray silty sandstone; overlain by reddish-b rown shal e.
Unconfomity
Unconfomity
Tax Upper Andesi te Sequen ce (18.3 Ma (?); Seager, and other s, 1984)
Thin to thick fl ows,commonly with basal agglome rate;vent compl exes of breccia, agglome rate and
tuff; dikes and small plug s.
Trp
Tr Rhyolite-Trachyte Sequen ce
Sheets of tuff and tuff b reccia, in places intertongued with tuffa ceous conglome rate; local fl ows and small to moderately large flow
domes, scattered di kes, small plugs and vent accumul ations.
Psa San Andres Formation
Limestone, fine-g rained, medium to dark gray, thin to medium bedded,fossili ferous, generally fetid when st ruck;
subordinate interbeds of sil ty limestone,yellowish to reddish silts tone, and reddish fine-g rained sans tone; forms
many ledgy outcrops.
Psa
Trr
Trv
Tax
Ta
Tai
Approximately Located or In ferred
Concealed
Gradational
Inter-unit Bedding Form Lines
Interfingered
Faults
Well-Located with Dip of Fault Plane
U
U = Upthrown Side
D
D = Downthrown Side
70
Inferred
Concealed
Mk Kelly Limestone (Mississippian)
Limestone and coquina, medium to very coarse g rained, light bluish g ray to very light gray, thick bedded to massi ve,
locally rich in lig ht colored chert; forms broad “whalebac k” outcrops and rounded clif fs.
Mk
Folds
Anticline
Mlt
Mltn
Mln
Lake Valley Formation (Mississippian)
Mlt Tierra Blanca Member
Limestone medium to coarse g rained, light to medium bluish g ray, platy to thick bedded, locally fossili ferous,
with sparse to abunda nt lenses of pin kish to light gray; some beds of coquina near top; scattered sil ty partings;
forms some led gy outcrops.
Mltn
Mln Nunn Member
Limestone, marl and coquina, fine to medium g rained, pinkish and yellowish to light gray,very thin bedded to
platy,richly fossili ferous; sparse pods of gray chert near base, and locally abunda nt thin l ayers of pin kish to light
gray chert in up per part; rarely well exposed.
Syncline ( Overturned)
Syncline
Symbols
Mla Alamogordo Member
Limestone, fine to medium g rained, medium to dark gray, medium to thick bedded, locally fossili ferous; layers and
bulbous lenses of che rt with distin ctive light and dark gray concentric layering; forms rib-li ke ocutcrops and l ocally
prominent clif fs.
Mla
Mlaa
Mlaa
Strike and Dip of Bedding
83
Ml
Vertical Bedding
Horizontal Bedding
Mlaa
Overturned Bedding
45
Mlaa Andrecito Member
Limestone and ma rl, fine to medium g rained, light to medium bluish g ray,very thin to medium bedded and l ocally
nodular,richly fossili ferous; includes nume rous sil ty partings and thick l ayers of deli cately bedded calcareous silt ;
rarely well exposed.
Tuff and Tuff Breccia
Fine to coarse g rained,reddish yellow to dark reddish b rown, thin to medium bedde d, moderately compact but not welded ;
forms smooth to rubbly slopes and sc attered low ledge s.
Conglome rate
Tuffaceous, pebbly to blocky, gray and buff to light reddish b rown, thick to medium bedded ; abundant angular to subrounded clasts of andesi te in a det rital andesi te matrix; forms low ledges and rubbly slope s.
Well-Located
I
Ps
Sandia Formation
Siltstone and sil ty sandstone, greenish g ray to reddish b rown,calcareous, slab by and pl aty to papery where weathered,
interbedded with limes tone, fine grained, light to medium g ray, medium to thick bedded,commonly che rty; some
medium to thick bedded, light gray to brownish o rthoquartzite in middle and up per parts; pebble to large-bl ock
conglome rate and b reccia, with f ragments of chert and coarse g rained limes tone at base; forms some led gy outcrops.
P
Is
Dikes, sills and small plug s.
Vent Breccia
Coarse and rubbl y, greenish g ray to reddish b rown closely pac ked blocks of andesi te in a m atrix of highly al tered pyroclastic
material; forms rubbly slopes and no p rojecting ou tcrops.
Contacts
Pm
Madera Formation
I
Limestone, fine to medium g rained, light to medium g ray, thin to very thick bedded,commonly che rty, locallly n odular,
sparsely to abunda ntly fossili ferous; numerous shaly pa rtings and rare layers of calcareous siltstone; thin to thick beds of
vit reous orthoquartzite near base ; thickest limestone beds form prominent gray clif fs,weathering b rownish whe re chert
is abunda nt.
P
Im
Vent compl exes of breccia, tuff breccia and tuf f.
Pyroxene Andesi te
Fine-g rained to aphaniti c, medium bluish g ray to dark bluish or g reenish g ray, dense and uni form to finely po rphyritic,
in part amygdaloidal ;weathers dull g ray, brownish g ray, maroon and reddish b rown; forms smooth to rubbly slo pes,
irregular ledge s, and p rominent dark clif fs and butt resses. Typically a felted agg regate of plagioclase l aths with i nterstitial
pyroxene, ores and rare bioti te, with or withour la rger subhed ral to euhed ral crystals of plagi oclase and pyroxene;
amygdaloidal fillings of calcite, silica, epido te,zeolites and chlo rite.
pCu Undifferentiated ( Geologic Cross Sections)
Pt
Transition Beds
I
Siltstone, mudstone, and sands tone, greenish to pinkish gray and yellowish to reddish b rown or maroon, generally
calcareous; numerous thin i nterbeds of fossili ferous gray to pinkish or g reenish n odular sil ty limestone; thin to thick
bedded, fine to medium g rained g ray limestone abunda nt in up per and middle pa rts; many thin to thick beds and
lenses of conglome rate with sil ty to sandy fossili ferous matrix and abunda nt pebbles of limes tone, siltstone and che rt;
uppermost part may be equi valent to Bursum Formation.
Pt
I
Ta Lower Andesi te Sequen ce
Thin to thick fl ows, generally with basal aggome rate; sheets and lenses of tuf f, tuff breccia, and conglomerate.
Tai
pCu
Pa Abo Formation
Siltstone, mudstone and sands tone,red, maroon, and yellowish to reddish b rown, thin to medium bedded, generally
calcareous; thin beds and lenses of g reenish g ray limestone and reddish b rown limestone-pebble conglome rate near
base; lowermost part fossili ferous and m ay be equi valent to Bursum Formation.
cg
Trb Tuff Breccia
Fine to coarse g rained, light gray and buff to purplish rown, moderately compact to densely welded, medium to thick bedded ;
weathers tan to reddish b rown; forms rubbly knobs and slo pes, ledgy slo pes and bold,vertically joi nted clif fs. Crystals and c rystal
fragments of quartz, sanidine and bioti te in a finely l ayered and de formed m atrix of devit rified glass ; flattened clasts of pumi ce in
some bed s, small to very large clasts of rhyolite in others; abundant blocks of andesi te in vent accumul ations; some beds with
numerous small c avities filled by intergrown quartz and al kali feldspar.
Tax
pCa Amphibolite
Medium
- to coarse-g rained, distin ctly foliated, medium to dark greenish g ray; numerous epido te-rich layers
and small a mygdaloidal pods; local lenses and l ayers of breccia (agglome rate?); small masses of metadiabase ;
in places cut by dense da rk-greenish g ray metadiabas e,forms dark colored slo pes.
Magdalena Group (Pennsyl vanian)
Trv Vitric-Crystal Tuff
Fine-g rained, light-gray and pin kish gray to whi te, loose to well consolid ated but not welded, thin to very thick bedded ; commonly
traversed by sub-parallel cross-f ractures; interlayered with tuff b reccia; weathers dull g ray to tan; forms smooth slopes and few
prominent outcrops. Crystals and c rystal f ragment of sanidin e, quartz, bioti te and glass in a d evit rified m atrix; rare small f ragments
of rhyolite and t rachyte; scattered cavities lined with euhed ral crystals of qua rtz and al kali feldspar.
Trb
pCa
Unconfomity (?)
Trr Rhyolite
Coarsely po rphyritic, light gray and pin kish gray, distin ctly flow-layered and l ocally somewh at vesicular; weathers reddish g ray to
maroon and reddish b rown; forms rough slopes and bold i rregular clif fs; in places associated with c rudely l ayered to massi ve
crystal tuff th at is similar in composition . Phenocrysts, chiefly large crystals and c rystal f ragments of quartz, alkali feldspar, and
bioti te, set in a fl ow-layered to brecciated aphanitic m atrix; locally abunda nt small mia rolitic agg regates of quartz and al kali feldspar.
Tr
pCm
Metarhyolite
Finely crystallin e, in gerneral porphyritic with sparse to abundant small phen ocrysts of quartz and al kali felsdpar,
pinkish to creamy-gray with in conspicuous g reenish-g ray speckling; distin ctly layered to essentially massi ve;
forms bold clif fs and extensive rubbly ou tcrops.
Py Yeso Formation
Sandstone and silts tone,varigated in shades of yellowish , greenish and reddish to reddish b rown, thin to medium
bedded ; abundant medium to dark gray, medium to thick bedded limes tone in middle and up per parts; rare thin beds
of gypsiferous siltstone; thickest limestone beds commonly form low,rib-li ke clif fs.
Pa
Trc Conglome rate
Tuffaceous, pebbl y, light-gray to brownish g ray, thin to medium bedde d,well cemented; abundant rounded to subangular
clasts of rhyolite, trachyte, andesi te, quartz and al kali feldspar in a det rital rhyolite matrix; forms low,rounded ou tcrops and
pebbly slope s.
Trc
pCm
Pay
Trt Trachyte
Medium to coarsely po rphyritic, light gray and buf f, flow-layered and in gene ral non-vesicular; weathers tan to brownish-g ray; forms
smooth to bouldery outcrop slo pes.Phenocrysts of al kali feldspar, sparse bioti te, and rare pyroxene in a t rachytic groundmass of
sanidin e, ore and glass.
Trt
Metamorphosed Volcanic Rocks
Manzano Group (Permian)
Py
Trp Rhyolite Porphyry
Porphyritic rhyolite dikes and plugs ; includes minor younger felsite and fine-g rained g ranitic di kes and plugs in the a rea of
Table Top Mountain.
PRECAMBRIAN
PALEOZOIC
Pyroxene Andesi te
Fine-g rained to aphaniti c, medium to dark gray and locally yellowish b rown to brick red, dense to finely vesicular and
scoriaceous; weathers dull g ray and b rownish g ray, locally pu rplish g ray to reddish b rown; forms slopes with pl aty to
blocky rubbl e, numerous rib-li ke ledges with rough su rfaces, and several high p rominent cliffs. Typically pilotaxitic
with sparse to rare small phenoc rysts of placioclas e,pyroxene, bioti te and ho rnblende ; widesp read dustings of o res;
vesicles open or pa rtly filled by calci te,zeolites, silica and chlo rite.
Tax
Cb Bliss Sandstone (Cambrian and O rdovician)
Upper part interbedded g reenish g ray to dark reddish b rown sandstone, siltstone, and sil ty limestone and dolomi te
and dolomi te, with many glau conite-rich layers; lower part interbedded lig ht gray vit reous orthoquartzite, greenish
gray to dark brownish g ray felspathic sandstone and sil ty sanstone, and medium to dark reddish b rown sandstone
with l ayers of oolitic hem atite; thick beds of orthoquartzite with thin lenses of qua rtz pebble conglome rate at base;
upper part of section forms dark colored slo pes with some ledge s, lower part light to dark colored clif fs.
Unconfomity
MESOZOIC
Kd
El Paso Limestone (Ordovician)
Bat Cave Member
Limestone and dolomi te, fine-grained, light to medium g ray and pin kish gray, thin to medium bedded and
in part irregularly bedded, locally cherty; sandy and sil ty partings in up per part; locally st romatolitic, det rital,
and i rregularly bedded ; thickest beds form low,rib-li ke clif fs.
Tuff
Fine grained and c rystal poor, greenish and pin kish gray to purplish b rown, thin to thick bedded, in general al tered;
compact but appa rently not welded ; typically i ntertongued with tuff b reccia; forms few extensive outcrops.
Tb Olivine Basalt
Mesa-capping remnants of flows;Porphyritic aphaniti c, dark gray, dense to vesicular, flow layered,
weathers medium g ray to reddish b rown; small to large phenoc rysts of lust rous brown olivine in
a groundmass of plagioclas e, olivin e,pyroxene and glas s.
Tb
Oe
Oe
Tuff Breccia
Medium to extremely coarse g rained, dull l avender and g reenish g ray to purplish g ray and dark maroon, massi ve and
dense, propylitically al tered; forms rounded hills with rubbly to bouldery slopes. Fine-g rained g roundmass of al tered
pyroclastic m aterials typically crowded with sub-andgular to rounded f ragments of latite and t rachyandesi te; clasts
of Permian sedime ntary rocks locally abunda nt near base of sequen c.e
TERTIARY
Tbx
Unconfomity
Strike and Dip of Foliation
23
Vertical Foliation
Unconfomity
Horizontal Foliation
46
Dp
Bearing and Plunge of Line ation
Dp Percha Shale (Devonian)
Siltstone, medium to dark gray, homogeneou s, in part calcareous; thin layer of phosph atic nodules at base; much
fractured and dis colored with i ron oxides; weathers to thin g reenish g ray chips and forms few extensive outcrops.
Direction of Landslide Movement
Landslide S carp
Dacite-Rhyolite Sequen ce
Sheets and l ocal vent accumul ations of tuff and tuff b reccia.
Tdl Lavender Member
Vitric-crystal tuff and tuff b reccia, medium to coarse g rainned, light gray and l avender to pinkish gray and buf f; medium
to very thick bedded ; locally welded and dens e, especially in l ower part; weathers yellowish to purplish b rown; forms
low to high clif fs and butt resses. Crystals of qua rtz, sanidin e, plagioclas e, and bioti te in a partly compacted matrix of
devit rified glass and f ragments of pumi ce.
Tdl
Tdw White Member
Vitric-lithic-c rystal tuf f, fine grained, light gray to whi te, thin to medium bedde d, soft and po rous; irregularly platy near
base; coarsens near top; weathers dull-g ray and forms few outcrops. Fragments of plagioclas e, bioti te, sparse qua rtz
and sanidin e, and pumi ce, daci te, and l atite in a m atrix of devit rified glass.
Tdw
Td
Tdr
Tdt
Tdtb
Tdv
Tdb
Tdr Red Member
Vitric-crystal tuff and tuff b reccia, fine to medium g rained, brick-red to brownish red,porous to compact; moderately
to densely welded in some a reas; forms rubbly slo pes and l ow clif fs. Distinctive flattened f ragments of pumi ce,
commonly an inch of mo re long, with f ragments of plagioclas e, sparse bioti te and sanidin e, and rare quartz in a compacted
groundmass of d evitirified glass dus ted with hem atite.
Unconfomity
Included in Dp
where not shown
Do
Radiomet rically Dated Sample Location
~ate Formation (Devonian)
Do On
Siltstone, medium to dark gray,calcareous, interbedded with medium g ray, silty, nodular to flaggy dolomi te and limes tone;
weathers to greenish g ray chips and yellowish to light brownish g ray plates and disk s.
Not shown;
included in
Omc
Generalized dip of bedding or foliation
projected on se ction
Tdt Tan Member
Vitric-lithic-c rystal tuf f, fine to medium g rained, white and pin kish-g ray to tan and lig ht reddish b rown, thin to medium
bedded ; generally po rous and pun ky, but in pla ces densely welded ; weathers medium b rown and forms local rounded
outcrops. Fragments of plagioclas e, bioti te, pumi ce,welded tuf f, and daci te in a d evit rified glassy m atrix. Tdtb Tuff
Breccia representing l ocal vent accumul ations.
M aximum estimated thicknesses of Cenozoic volcanic units west and
ea
st of the Sierra Cuchillo
Area and Thickness* (feet)
OLIVINEBASALT
Tb,Tbx,Tbi
OFGM 115
This map is the result of field work in the Chise Quadrangle between 1975 and 1979 as part of a Ph.D. thesis under the
supervision of R.H. Jahns, (McMillan, 1979). Mapping in the Cuchillo Negro Range was begun in 1942 by Jahns, and
continued intermittently thereafter until completion of the Chise Quadrangle in 1979. Field work was supported by the
New Mexico Bureau of Mines and Mineral Resources and Jahns. We were assisted in the field at various times by John P.
Anderson, Jr., John A. Baltierra, and Dorothy L. Fisher. Other support was provided by New Mexico residents Roland and
Jeannette Johnson, and Rob and Mernie Cox. Professor C.E. Chapin provided the age date of the Cuchillo Mountain
monzonite intrusive before its publication. Compilation of the map and computer graphics was supported by McMillan and
Quaternary Science Applications.
OLDER
VOLCANICROCKS
Tl,Tm,Tlm,Tla
COMMENTS TO MAP USERS
Mapping of this quadrangle was funded by a matching-funds grant from the STATEMAP program
of the National Cooperative Geologic Mapping Act, administered by the U. S. Geological Survey,
and by the New Mexico Bureau of Geology and Mineral Resources, (Dr. Peter A. Scholle,
Director and State Geologist, Dr. J. Michael Timmons, Geologic Mapping Program Manager).
New Mexico Bureau of Geology and Mineral Resources
New Mexico Tech
801 Leroy Place
Socorro, New Mexico
87801-4796
[505] 835-5490
http://geoinfo.nmt.edu
This and other STATEMAP quadrangles are (or soon will be) available
for free download in both PDF and ArcGIS formats at:
http://geoinfo.nmt.edu/publications/maps/geologic/ofgm/home.html
A geologic map displays information on the distribution, nature, orientation, and age relationships
of rock and deposits and the occurrence of structural features. Geologic and fault contacts are
irregular surfaces that form boundaries between different types or ages of units. Data depicted
on this geologic quadrangle map may be based on any of the following: reconnaissance field
geologic mapping, compilation of published and unpublished work, and photogeologic interpretation.
Locations of contacts are not surveyed, but are plotted by interpretation of the position of a given
contact onto a topographic base map; therefore, the accuracy of contact locations depends on the
scale of mapping and the interpretation of the geologist(s). Any enlargement of this map could cause
misunderstanding in the detail of mapping and may result in erroneous interpretations. Site-specific
conditions should be verified by detailed surface mapping or subsurface exploration. Topographic
and cultural changes associated with recent development may not be shown.
Cross sections are constructed based upon the interpretations of the author made from geologic
mapping, and available geophysical, and subsurface (drillhole) data. Cross-sections should be used as
an aid to understanding the general geologic framework of the map area, and not be the sole source
of information for use in locating or designing wells, buildings, roads, or other man-made structures.
The map has not been reviewed according to New Mexico Bureau of Geology and Mineral Resources
standards. The contents of the report and map should not be considered final and complete until
reviewed and published by the New Mexico Bureau of Geology and Mineral Resources. The views and
conclusions contained in this document are those of the authors and should not be interpreted as
necessarily representing the official policies, either expressed or implied, of the State of New Mexico, or
the U.S. Government.
REFERENCES
CRETACEOUS
STRATA
Kd
Baldridge, W.S., Bartov, Y., Kron, A. (1983), Geologic Map of the Rio Grande Rift and Southeastern
Colorado Plateau, New Mexico, and Arizona, Supplement to the Rio Grande Rift: Tectonics
and Magmatism (1979; Second Printing 1982), edited by R.E. Riecke r, American Geophysical
Union, Washington, D.C., 438 p.
Chapin, C.E., Jahns, R.H., Chamberlin, R.M., and Osburn, G.L. (1978), First Day Road Log from
Socorro to Truth or Consequences via Magdalena and Winston, New Mexico Geological
Society, Special Publication No. 7, pp. 131-138.
Chapin, C.E., McIntosh, and Chamberlin, R.M. (2004), The Late Eocene-Oligocene Peak of Cenozoic
Volcanism in Southwestern New Mexico, in The Geology of New Mexico, a Geologic Histor y,
New Mexico Geological Society, p. 271-293.
Harley, G.T. (1934), The Geology and Ore Deposits of Sierra Count y, New Mexico, New Mexico
Bureau of Mines and Mineral Resources, 220 p.
Huskinson, E. J. (1975), Geology and Fluorospar Deposits of the Chise Fluorospar District, Sierra
County, New Mexico, M.S. thesis, University of Texas at El Paso, 73 p.
Jahns, R.H., McMillan, D.K., O’Brient, J.D., and Fishe r, D.L. (1978), Geologic Section in the Sierra
Cuchillo and Flanking Areas, Sierra and Socorro Counties, New Mexico, New Mexico
Geological Society Special Publication No. 7, pp. 131-138.
Maxwell, C.H., and Heyl, A.V. (1976), Preliminary Geologic Map of the Winston Quadrangle, Sierra
County, New Mexico, U.S. Geological Survey, Open-File Report 76-858, Scale 1:24,000.
Maxwell, C.H., and Oakman, M.R. (1990), Geologic Map of the Cuchillo Quadrangle, Sierra
County, New Mexico, U.S. Geological Survey, Geologic Quadrangle Map, GQ-1686, Scale
1:24,000.
PERMIAN
STRATA
Psa,Pay,Py,Pa
700
100
550
550
250
(400)
(830)
(630+)
AMPHIBOLITE
AND
METARHYOLITE
pCm, pCa
Lavender Member
Tdl
100
200
200
W hite Member
Tdw
100
50
NP
Red Member
Tdr
NE
30
30
Tan Member
Tdt
NE
50
NP
Varigated Member
Tdv
NE
100
NP
Basal W elded Member
Tdb
200
400+
400+
Tla
600+
L
A
McMillan, N.J. (2004), Magmatic Record of Laramide Subduction and the Transition to Tertiary
Extension: Upper Cretaceous Through Eocene Igneous Rocks of New Mexico, in the
Geology of New Mexico, a Geologic Histor y, Nexico Geological Society, p. 249-270.
O
T
0
5
8
2
800+
+
0
8
Unit
s t i n
U
c i o
z
San Andres Formation
n
n
o
s
e
Psa
o i t a
m
o i t a
r o
m
r o
Magda lena "Transition Beds"
Diagram illustrat ing age and fieldrelat ionships of principal fault s and nit rusive masses wit hrespect to t he strat igraphic
section in theSierra Cuchillo and flanking areas. Vertical proportionsreflect differences in thicknesses of most
stratigraphic units, but are not to scale(Jahns, et. al., 1978;Figure 2).
Cuchillo MountainRed Hill Pass
(CM and RH)
Cross Mountain
(CRM)
Fy
M5
3
5
300+
2
2
Po
s
+
0
3
0
3
5
5
0
5
7
5
6
7
+
0
5
0
2
9
0
6
9
Pt
220
0
75
105
900+
915
985
128
n
m
o i t a
i kL
m
Tierra Blanca Member
r o
M
y l l e 1K 4
F
y
Mltn
Mlaa
Andrecito Member
e l a
n
h
S
a
o i t a
e t i
m
h
m
o l o
Om
n
1 (
8
16
18
75
56
14
1
m
9
1
l e
6
(105+)
u
1
1
1
8
7
F5
3
(189)
(131)
Cutter Member Omc
55
38
25
50+
83
47
Uphan Member Omu
52
El Paso Limestone
NE
50
Omcc
NE
18
7
Oe
NE
(289)
(177)
Bat Cave Member
NE
119
58
Sierrite Limestone
NE
170
119
n
o t s
T
d
n
a b S C s s i lE B N
+
5
5
7
0 , 3
1 (
14
4
s s
0
13
12
0
4
) 1
99
3
a
3
)a 3L 1
Aleman Member Oma
Cable Canyon Sandstone
e
D
4
k
r o oF De t a 9n 1 O
Montoya Dolomite
s l a t o
e) l 0l a3 V1 ( e
8
c r p e DP
173
1
11
Nunn Member
Alamogordo Member
2
+Y 0
138
e
1
e
Pm
o t s
0
700+
A
Psa
n
Iron Mountain
1
Fa oP b
Madera Limestone
e
8
1,360
Sandia Formation
5
2
9
1
2 , 5
7
2
+
* Thicknesses of units that are incompletely exposed or are in part faulted out are indicated with plus
marks; total thicknesses of formations for which thicknesses of individual members also are listed are
enclosed by parentheses.
NE Unit not exposed in area
Seager, W.R., M. Shafigulla, Hawley, J.W., and Marvin, R.F. (1984), New K-Ar Dates from Basalts
and the Evolution of the Southern Rio Grande Rift, Geological Society of America Bulletin,
V. 95, p. 87-99.
800+
+
Area and Thickness* (feet)
McAnulty, W.N. (1978), Fluorospar in New Mexico, New Mexico Bureau of Mines and Mineral
Resources, Memoir 64, 64 p.
McMillan, D.K. (1979), Crystallization and Metasomatism of the Cuchillo Mountain Laccolith, Sierra
County, New Mexico, Ph.D. Dissertation, Stanford Universit y, 217 p.
T
Maximum Observed Thicknesses of Pre-Cenzoic Sedimentary Units in Southern, Central, and Northern
Parts of the Sierra Cuchillo (Jahns, and others, 1978)
PENNSYLVANIAN
STRATA
Pt, Pm,Ps
CAMBRIANMISSISSIPPIAN
STRATA
Mk, Mltn, Mlaa, Dp,Do, Omc,Oma,
Omu, Omcc,Oe
Jahns, R.H. (1955), Geology of the Sierra Cuchillo, New Mexico, New Mexico Geological Societ y,
Sixth Field Conference, Guidebook of South Central New Mexico, P. 158-174.
Mack, G.H. (2004), Middle and Late Cenozoic Crustal Extension, Sedimentation, and Volcanism in
the Southern Rio Grande Rift, Basin and Range, and Southern Transition Zone of
Southwestern New Mexico, in The Geology of New Mexico, a Geologic Histor y, New
Mexico Geological Society, p. 389-406.
Tr
Ta
NE Unit not exposed in area
APLITE AND GRANITE INTRUSIONS Trp
New Mexico Bureau of Geology and Mineral Resources
Open-file Map Series
ACKNOWLEDGEMENTS
1350 +
Rhyolite-Trachyte Sequence
Lower Andesite Sequence
* Thicknesses of units that are incompletely exposed or are in part faulted out are indicated with plus
marks; total thicknesses of formations for which thicknesses of individual members also are listed
are enclosed by parentheses.
PORPHYRITIC RHYOLITE DIKES AND PLUGS Trp
The geology as shown in the map and cross sections and data from this explanation are
preliminary and subject to revision. The map compilation has not been field checked and does
not reflect natural or cultural changes in the area since 1979.
CONTOUR INTERVAL XX FEET
NATIONAL GEODETIC VERTICAL DATUM OF 1929
NP
NP
FAULTS
1 KILOMETER
by
Richard H. Jahns, Kent McMillan, and James D. O'Brient.
NOTE
FAULTS
7000 FEET
FELSITE INTRUSIONS Trp
DRAFT
0
6000
LATITE SILLS AND DIKESTl
After this map has undergone scientific peer review, editing, and final cartographic
production adhering to bureau map standards, it will be released in our Geologic Map
(GM) series. This final version will receive a new GM number and will supercede
this preliminary open-file geologic map.
5000
MONZONITE INTRUSIONS Tm,Tlm
This draft geologic map is preliminary and will undergo revision. It was produced
from either scans of hand-drafted originals or from digitally drafted original maps
and figures using a wide variety of software, and is currently in cartographic production.
It is being distributed in this draft form as part of the bureau's Open-file map series
(OFGM), due to high demand for current geologic map data in these areas where
STATEMAP quadrangles are located, and it is the bureau's policy to disseminate
geologic data to the public as soon as possible.
4000
SHEARZONES
QUADRANGLE LOCATION
Magnetic Declination
May, 2006
9º 57' East
At Map Center
0.5
3000
CROSS
WILLIAMSBURG NW
1
2000
NP
NP
S
MAJOR
THUMB
TANK
PEAK
PRIEST
TANK
1000
100
500
Latite-Andesite Sequence
LONGITUDINAL
SUGARLOAF
PEAK
Chise
CHISE
0
Tb
Tax
WINSTON BEDS
AND
CUCHILLO BEDS
Twc
OTHER
1000
May 2006
Olivine Basalt Sequence
Upper Andesite Sequence
Dacite-Rhyolite Sequence
YOUNGER
VOLCANICROCKS
Tax,Tav,Tai (?)
Tr,Trt,Trc,Trr/Trv,Trb
Ta,Td,Tdl,Tdw,Tdr,Tdt
Tdv,Tdb
East Side
Willow Springs
FAULTS
MONTICELLO
NEW MEXICO
WINSTON
1 MILE
Tdb Basal Welded Member
Tuff breccia, fine to coarse g rained, pale l avender and pin kish gray to purplish and reddish b rown, thin to very thick
bedded ; in general densely welded, but locally less welded or compacted near top; uppermost part locally rich in
small geodes ; weathers buff to purplish and da rk reddish b rown; forms numerous ledge s,knobs and bol d, irregular
cliffs. Groundmass of d evit rified glass c rowded with f ragments of latite, andesi te, and l atitic tuf f; abundant flattened
clasts of d evit rified pumi ce; rare fragments of plagi oclase, quartz and bi tote.
East Side
HOK
West Side
Chise
Unit
ALLUVIUM (Qal), TALUS (Qt ), OLDER ALLUVIUM (Qoal), AND LANDSLIDE DEPOSTIS (Qls)
Tdv Variegated Member
Vitric-lithic-c rystal tuf f, fine-g rained,yellowish and pin kish gray to brown and b rownish red, thin to medium bedded ;
generally po rous and pun ky, but in pla ces welded or well cemem nted;forms local ledges and rounded ou tcrops.
Fragments of plagioclas e, bioti te, pumi ce,welded tuf f, daci te, and l atite in devit rified glassy m atrix.
PALEOZOIC
JARALOSA
MOUNTAIN
0
Jasperoid replacement; mainly of
carbonate units
Unconfomity
PRECAMBRIAN
IRON
MOUNTAIN
0.5
Jog in Section
Fusselman Dolomite (Silurian)
Dolomi te, fine to medium g rained, medium to thickly bedded, locally che rty;forms ledges and l ow clif fs.
RANGE-FRONT
1
Cross-Section Line
si
CENOZOIC
1:24,000
Geologic map of the Chise
quadrangle, Sierra County, New Mexico.
A‘
Unconfomity
PEDIMENT GRAVELS Tp
Base map from U.S. Geological Survey 1965, from photographs taken 1964, field checked in 1965.
1927 North American datum, Polyconic projection, reprojected to UTM projection -- zone 13N
1000-meter Universal Transverse Mercator grid, zone 13, shown in red
A
1
0
8
3 , 4