NEW MEXICO BUREAU OF GEOLOGY AND MINERAL RESOURCES A DIVISION OF NEW MEXICO INSTITUTE OF MINING AND TECHNOLOGY NMBGMR Open-file Map Series OFGM 35 Last Modified May 2003 (SANDIA PARK) EDGEWOOD QUADRANGLE NEW MEXICO B SAN PEDRO 12 MI. 3 000m. 106º07'30" (KING DRAW) 106º15' R. 6 E. R. 7 E. 87 E. 12'30" CEDAR GROVE 3.1 MI. (SAN PEDRO) 10' R. 7 E. R. 8 E. 35º07'30" 35º07'30" o &ws Qp3 Qc Qa 5 Qp &ws Qa Description of Map Units Geologic Discussion Qp Qp3 Qa Correlation of Map Units &ws Qc Qc Qp Qa Qvac &wp Qc Qc Quaternary 38 000m. Qcr Qp2 87 N. o Qcr Qp3 6 Qp2 The Edgewood 7.5-minute quadrangle is located approximately 40 km east of o9 Valley-floor alluvium (Holocene) — Predominantly silt, sand, and clay in modern Qc Qa Albuquerque, NM along the eastern side of the Manzanita Mountains (see location map). Qvac &ws &ws Qa drainage channels and underlying floodplains. Coarser grained materials occur in Qa Qp2 The town of Edgewood, which lies along Interstate Highway 40, is located on the Qvac Qc some areas. Unit is inset into unit Qp and older deposits of unit Qvac, and Qa U Qa quadrangle. About half of the map area is underlain at relatively shallow depths by Qc Qp Qvac D Qp interfingers with younger deposits of units Qvac and Qc along drainage foot slopes. sedimentary rocks consisting of limestone, shale, and sandstone of the Pennsylvanian Holocene Qp Qp3 Qc 4 Includes unmapped bedrock exposures in scoured channel reaches. Unit is Madera Group. Bedrock uplands are generally covered by stands of pinyon and juniper and Qc &ws generally less than 3 m thick. &ws Qc thin to moderately deep, well-drained soils form an extensive cover over many upland areas Qa Qp Qp3 Qa shown as bedrock on the map. The northeastern part of the quadrangle is underlain by up to Colluvium mantling side slopes of drainages on the Estancia basin piedmont o Qp Qc Qc several tens of meters of valley- and basin-fill alluvium of the Estancia basin, and is o 3 Qc Qvac &ws Qc slope (Late Pleistocene (?) to Holocene) — Derived from erosion of piedmont 2 Qc dominated by grass cover. No perennial streams flow through the map area and water for Qa Qc surface deposits and older, basin-fill deposits. Includes unmapped deposits of units stock and domestic use is dependent on groundwater supplies. Average annual precipitation Qp Qp 2-4 and older basin fill, and interfingers with valley-floor alluvium (Qa) along Qa for the area is on the order of 12 inches (~30cm.). Qp Qa Qp3

o Qp3 drainage foot slopes. Unit is estimated to be less than 5 m thick. Qp3 o4 Qa 4 Qp3 Qa Qp3 &wp Middle and upper piedmont-slope alluvium and colluvium (Middle Pleistocene 106º 20' Qc Qc Qp Qp (?) to Holocene) — Includes alluvial fan and coalescent alluvial fan complex along 3 Qa Qp3 o western uplands of the Estancia basin, and younger, inset alluvial fills. May also Tertiary Qvac Qcr &ws Qp3 3 Intrusion include contributions of eolian sediment. Predominantly silt and sand, with coarser \ Late Pleistocene o Qp2 5 Qc Sandia Mtns grained beds dominated by sand and gravel present in the vicinity of uplands and 25 Qa Qc Paleozoic-Mesozoic Qp \ Qp Qc along high-order drainages. Undivided unit (Qp) is mapped along the upper Sedimentary Rocks Qp piedmont slope where it forms a relatively thin mantle (generally less than 10 m &ws Qa Qa Qa Qp Qc Qa thick) over bedrock, and is depicted schematically on cross section A-A' to include Piedmont Slope &ws Albuquerque Qa o 5 surface deposits and underlying, older basin fill. Three surface units (Qp2-4) are Tijeras-Gutierrez Qc differentiated on the map (unit Qp1 is present north of the map area in the vicinity Structural Zone Qc Quaternary Qc Qp3 35º 05' CENOZOIC Qp Qp Qa of South Mountain).

Qvac &ws Manzanita - Manzano Mtns o Qc

Qvac Qp4 \

Qvac 7 Piedmont alluvium, inset into unit Qp3 and older basin-fill deposits (Late Edgewood o Qa Qp2 Qp4 Qp2 Pleistocene to Holocene(?)) — Predominantly sand and silt, with varying 40 4 U D Qa amounts of gravel and clay. Represented in the map area by deposits along Moriarty

Qc Qc Qa Qp4 Qp4 Bachelor Draw. Estimated thickness is about 3 m. o Qp3 Qvac Qa Rio Grande Map area 5 Qc &ws Qc Piedmont Slope o Qp3 Estancia Qp Qc Piedmont alluvium, inset into unit Qp2 and older basin-fill deposits Basin 7 Qp3

ALBUQUERQUE 25 MI. N. MEX 10 8.6 MI. TO Qp4 &ws (Middle to late Pleistocene (?)) — Predominantly sand and silt, with Basin Qp Qp Qa Qc varying amounts of gravel and clay. Unit comprises extensive deposits along

Qvac N. MEX. 44 6.3 MI TO 13 MI. MORIARTY Qvac Qp2 major drainages. Estimated thickness is 3 m or more, although some areas

Drainage Middle Pleistocene 05' Qa Qp2 Qc 05' Qp4 mapped as Qp3 may represent erosional surfaces with minimal accumulation Divide &ws Qa Qp3 Qa of overlying fill.

&ws Qp4 Qp3 Qa Qa Qc Piedmont alluvium underlying highest interfluvial summits in map area Qa Qp2 Qvac (Middle to late Pleistocene (?)) — Predominantly sand and silt, with \ &ws Qc o Qp Qc varying amounts of gravel and clay. Unit has been extensively incised in 3 Qp Qc 0 5 10 mi &ws Qp3 Qp4 Qp2 vicinity of major drainages, and is underlain by older basin-fill deposits. Qa 0 10 20 km Qcr Qc &ws Qp Qc Qp4 Upland-valley alluvium and colluvium (Middle Pleistocene (?) to Holocene) — Qa Qa Qvac &wp Qvac &ws Qp Predominantly silt, sand, and gravel grading into relatively coarse-grained &ws &ws Qc Map showing location of Edgewood quadrangle, generalized geology, and physiographic features. Surface &ws Qp3 Qa colluvium along valley backslopes. Along high-order drainages unit consists of drainage to the east is into the topographically closed Estancia basin. Qp Qc

&ws eroded older deposits and younger inset fills. Includes unmapped bedrock Late Qa &ws &wp Qp3 Qp3 exposures along valley backslopes. Thickness ranges from a few meters or less in &wp Qc &wp upland valleys and over bedrock highs, to an estimated 10 m or more along trunk o Qp &ws Qc Qa Qp3 2 Qp drainages. Qa Availability of groundwater from wells in the Madera Group aquifer system is generally thought to &ws Qa depend on fractures and dissolution channels in limestone units (Titus, 1980), although siliciclastic &m Qa Qp Qc Alluvium, colluvium, and residuum on valley backslopes and interfluvial &ws Qc Qa Qcr intervals may contribute to the yield of some wells. Evidence for subsurface dissolution of limestone in Qp3 Qvac &ws Qa summits in bedrock uplands (Middle Pleistocene (?) to Qvac Qp the area includes sinkholes at the surface and the Edgewood caverns (accessible through the casing of a PALEOZOIC Qa &ws Qp Holocene)—Predominantly silt, clay, and sand. Derived from weathering of the Pennsylvanian o dry borehole) north of the town of Edgewood. Because of the interbedded lithologies of the Madera Middle Qvac 5 &wp Qa Madera Group (residuum on relatively flat-laying areas), and from downslope Qvac &ws Group and resulting heterogeneity with respect to groundwater flow, confined or semi-confined aquifer &s

(SEDILLO) Qa transport of weathering products. Mapped where accumulations cover extensive &wp o systems and local, perched aquifers may exist. Compared to areas immediately underlain by bedrock on Qp Qp3 NORTH) (MORIARTY 4 areas and are sufficiently thick to support large areas of grass cover. Also includes Qvac Qc the Edgewood quadrangle, the shallow aquifer system to the east of the map area, along the axis of the Qp Qp2 Qvac &ws areas of unmapped bedrock exposure. Unit ranges from less than one to several Estancia basin, consists of unconsolidated sediments of the Estancia basin-fill. Wells in the basin-fill o &ws Qp3 meters in thickness. 4 &ws &wp Qc aquifer system are capable of yielding 100s of gallons per minute and yield sufficient groundwater for Qvac Qvac Qp o3 extensive agricultural activity toward the axis of the basin. The Edgewood quadrangle is located along &wp Qa Qc Pennsylvanian the transition from upland areas dependent on the Madera Group aquifer system, to areas that utilize the &wp Qa Qa &ws &ws Qc Qp Qp3 basin-fill aquifer system of the Estancia basin to the east. &ws Qc Wild Cow Formation (Upper Pennsylvanian) — Approximately 115 m (~380 ft) Qp &ws Qp3 &wp &wp Qa Qc of the lower part of the Wild Cow Formation is exposed across the map area. Xu &ws o &ws Qp Qp3 Outcrops are largely restricted to limestone ledges and resistant sandstone beds; Quaternary Map Units 7 &wp Qc o4 Qp3 Qp3 &wp Qa Qa Qp2 exposures of fine-grained siliciclastic intervals are generally limited to roadcuts and Qvac the walls of arroyos. Unconsolidated surface deposits in the map area consist of upland-valley alluvium and colluvium, and D U Qcr &ws o &wp piedmont alluvium and colluvium derived from weathering of shale, limestone, and sandstone of the Qvac 3 Qp2 Qp2 Pine Shadow Member — Approximately 40 m (~130 ft) of the lower part of PROTEROZOIC o &wp Pennsylvanian Madera Group. Sediment transport is toward the east and the western piedmont of the o Qc the member is exposed in the map area, where it consists of 2 to 3 siliciclastic 2 Qa 2 topographically closed Estancia basin. Map units consist of valley-floor alluvium associated with &ws &wp Qvac &ws intervals, several meters thick, and intervening intervals, up to a few meters modern drainages (Qa), upland valley alluvium and colluvium (Qvac), alluvium, colluvium, and Qcr Qa Qa &ws Qp A' in thickness, dominated by ledge-forming limestone beds. Siliciclastic residuum on valley backslopes and bedrock uplands (Qcr), and piedmont alluvium and colluvium (Qp o &wp intervals are generally poorly exposed and contain thin interbeds of tabular- 02'30" o 2 02'30" and Qc). Downcutting and overall basinward shifts in deposition on the Estancia basin piedmont have &ws 3 Qc T. 10 N. and nodular-weathering limestone and calcareous shale. A one- to T. 10 N. &wp &ws resulted in a stepped sequence of surface deposits that are generalized on the map to include an older Qa Qvac T. 9 N. several-meter-thick sandstone to silty sandstone commonly crops out

T. 9 N. Qa Qc unit that caps the highest interfluvial summits (Qp2), and younger inset fills (Qp3, Qp4, and Qa). &ws approximately 12 m (~40 ft) above the base of the member in the map area.

&wp o &wp Qvac Qa Qvac &wp 2 Qp o Exposed blocks of sandstone from this interval are generally red to yellow, o Qp2 Unconsolidated deposits in upland valleys are generally on the order of 10 m. thick or less, but may be (1946) in the vicinity of the Lucero uplift. Recent recommendations to simplify the &ws o 17 11 Qcr 2 are composed of fine- to coarse-grained sand and pebbly sand, and are &wp &wp &wp Qa 20 m. thick or more in places, especially in the large N–S-trending valley on the western edge of the stratigraphic nomenclature of Pennsylvanian rocks in New Mexico (Kues, 2001) suggest 16 o 2 &wp quartzose to arkosic. Ledge-forming limestone intervals typically consist of N o Qcr o4 &ws map. Unconsolidated deposits in the Estancia basin to the east of the map area reach a maximum that the formation names Los Moyos and Wild Cow may eventually be abandoned in favor Qvac mudstones and wackestones, although coarse skeletal fragments are abundant 15% &wp thickness of ~120 m. (New Mexico State Engineer, 1967). Maximum thickness of unconsolidated of the names Gray Mesa and Atrasado, which have precedence. Qvac &ws &ws Qvac Qvac &ws in some beds. Fusulinids are abundant in the lower few meters of the map &ws Qvac deposits along the Estancia basin piedmont within the map area is on the order of 30 to 40 m, based on &ws &ws Qvac Qa &ws &wp unit. Total thickness of the Pine Shadow is approximately 60 to 90 m (200 to &wp Qa &ws &wp Qa 10 Qvac well-driller's logs for the area. These piedmont-slope deposits include the surface deposits shown on the Myers (1988) concluded that most of the Los Moyos limestone lies within the fusulinid Qvac 300 ft) thick on adjoining quadrangles to the west and southwest. &ws &ws Qp map, and underlying, older deposits that are referred to here as the Estancia basin fill. zone of Beedeina, indicating that the unit is correlative to Desmoinesian strata of the Qa &wp Qa o &ws &wp &ws 3 o 4.8 MI. MORIARTY mid-continent. The overlying Wild Cow Formation lies within the zone of Triticites, and o 4 84 MI. ROSA SANTA 5 3 Absolute ages for Quaternary map units on the Edgewood quadrangle are not available. Relative ages corresponds for the most part to Missourian and Virgilian strata of the mid-continent. The &wp &wp Qa Sol se Mete Member — Approximately 75 m (~250 ft) of the upper part of Qa Qvac Qvac &ws for piedmont surface deposits are indicated by inset relationships. Older surface deposits on the Wild Cow Formation was subdivided by Myers (1973) into three members. The three &wp the member is exposed in the map area. The upper 5 to 10 m (~15 to 30 ft) Qvac &wp &ws piedmont contain well-developed, pedogenic accumulations of carbonate (stage II to stage III carbonate members in ascending order are the Sol se Mete, Pine Shadow, and La Casa. Each of the W E o &ws of the unit is dominated by thick beds of ledge-forming limestone. 3 &ws development), suggesting late and perhaps middle Pleistocene ages for units Qp2 and Qp3. Little is three members conceptually consists of a basal sequence containing an abundance of Rose diagram of joint orientation data, Underlying deposits consist of yellow, gray, and red shale with discontinuous Qa known regarding the age of older basin-fill deposits that are covered by the surface deposits shown on siliciclastic beds that grade upward into capping intervals dominated by carbonate-shelf Edgewood quadrangle. N = 303.

Qa &ws siltstone and sandstone interbeds, and limestone beds that range from less o the map. These older deposits may range in age from Pliocene to late Miocene (Smith, 1957). Geologic limestones. Subdivision of the Madera Group on the geologic map and cross sections uses &wp Qvac than one to a few meters in thickness. Limestone beds are typically Qvac &ws 65R &ws &ws events leading to topographic closure of the Estancia basin, and the timing of basin closure, are also this nomenclature of Myers (1973). Surface exposures in the map area are probably limited &wp &ws mudstones and wackestones, although brachiopods, crinoid stems, and other &wp Qvac Qa &wp &ws &wp speculative. to portions of the Sol se Mete and Pine Shadow Members of the Wild Cow Formation. &ws bioclasts are abundant in some intervals. Two limestone intervals containing A Qvac &ws o &ws o abundant Triticites, one near the top of the Sol se Mete and another 2 o o o 3 Qa

7o 5 10 Qa approximately 30 m (~100 ft) below the top of the unit can be traced laterally 3 &wp Bedrock Map Units Structure &wp o Qa &wp Qcr in the northern part of the map area. Total thickness of the Sol se Mete is Qvac Qvac 13 o3 Qvac &ws o Qcr assumed to be 90 m (~300 ft) on the cross sections. Qvac Qa 5 The Edgewood quadrangle lies several km to the east of the NE-SW trending &ws Qvac Qcr Surface exposures of bedrock in the map area belong to the Madera Group. The Middle to Upper &wp &wp Qcr Tijeras-Gutierrez structural zone, which exhibits a variety of structural features including References &ws Qcr Los Moyos Limestone (Middle Pennsylvanian) (cross sections only) — On Pennsylvanian (Desmoinesian-Virgilian) Madera Group includes marine and marginal-marine carbonate &wp &wp &m Qa &wp faults and folds within Phanerozoic sedimentary rocks and surface exposures of Proterozoic Qcr &wp adjoining quadrangles to the west and southwest, the Los Moyos Formation is and siliciclastic sediments consisting of interbedded limestone, shale, sandstone, and minor Qvac o Qcr basement. The region was subjected to compression during the latest Mesozoic–Paleogene Karlstrom, K.E., and others, 1999, Sandia Mountains and Rio Grande rift: &ws 4 characterized by several meter-thick intervals of thin- to thick-bedded limestone conglomeratic sandstone. The thickness of the Madera Group in the vicinity of the Sandia and Manzano Qcr Qvac &wp ancestry of structures and history of deformation: New Mexico &wp 4 o Laramide orogeny, followed by Neogene extension that resulted in formation of the Rio o 3 and thin shale and calcareous shale interbeds, separated by one to several Mountains ranges from about 400 m (Kelley and Northrop, 1975) to perhaps 580 m or more (Read, et Qp Geological Society, Guidebook 50, p. 155-165. 4 o Qa Grande rift to the west (Karlstrom, et al., 1999). To the east of the Tijeras-Gutierrez o 5 &ws meter-thick intervals containing relatively abundant, fine-grained siliciclastic al., 1944, measured section 14), and has traditionally been divided (e.g., Read, et al., 1944; Kelley and &wp Qa Qa sediment. The formation also contains relatively minor sandstone and pebbly Northrop, 1975) into a lower unit containing a large proportion of limestone (“lower gray limestone”), structural zone in the vicinity of the Edgewood quadrangle, sedimentary rocks of the Madera &wp Kelley, V.C., and Northrop, S.A., 1975, Geology of Sandia Mountains and &wp Qvac sandstone interbeds. Limestones commonly contain abundant chert. Overall the and an upper unit containing a large proportion of siliciclastic sediments (“upper arkosic limestone”). Group occur near the surface and generally dip a few degrees toward the east. This Qvac Qvac &ws Qvac &wp Qa Vicinity, New Mexico: New Mexico Bureau of Mines and Mineral o 38 000m. eastward-dipping structural trend, as noted by Kelley and Northrop (1975), is disrupted by a Qa &wp 74 N. Los Moyos Formation contains a higher proportion of limestone relative to The Madera Group gradationally overlies rocks of the Middle Pennsylvanian (Atokan) Sandia Qvac 3 Qvac Qvac Resources, Memoir 29, 135 p. siliciclastic sediments than in the overlying Wild Cow Formation. Assumed to be Formation, which is also marine to marginal-marine in origin and is dominated by siliciclastic N-S trending, down-to-the-west fault zone that cuts across the Edgewood quadrangle. This o Qvac Qa 7 180 m (~600 ft) thick on the cross sections. structure is expressed geomorphically by the large N-S trending valley on the western edge &wp &ws &wp sediments. The Sandia Formation generally overlies Proterozoic crystalline rocks in the area, although Kelley, V.C., and Wood, G.H., 1946, Lucero uplift, Valencia, Socorro, and &ws Qcr &wp &wp &wp of the map and the ridge immediately to the east of this valley. Limited field evidence,

&wp &ws a thin (up to 20 m. thick) sequence of limestone and shale deposited during the Mississippian (?) occurs o &wp Bernalillo Counties, New Mexico: U.S. Geological Survey, Oil and Gas

&wp Qp including the geometry of the probable trace of the fault with respect to topography, and a o Sandia Formation (Middle Pennsylvanian) (cross sections only) — On &ws &ws 5 &wp Qcr between the Sandia Formation and Proterozoic crystalline rocks at several localities in the Sandia and Qvac Qcr &ws &ws Qvac &wp &s Investigations Preliminary Map 47, scale approx. 1:62,000. &wp &wp Qvac Qvac 3 &wp single fault-plane exposure in the southwestern part of the map area, is consistent with 35º00' 35º00' adjoining quadrangles to the west and southwest, the Sandia Formation consists of Manzano Mountains (Kelley and Northrop, 1975). The Madera Group is gradationally overlain by the R. 6 E. R. 7 E. 3 000m. 106º05' 12º30' CHILILI 16 MI. (CHILILI) 10' R. 7 N. R. 8 N. 97 E. 106º07'30" (MORIARTY SOUTH) sandstone, shale, and pebbly sandstone, with thin interbeds of limestone and reverse movement across the fault zone. Three approximately E-W trending faults are B' Bursum Formation (Virgilian-Wolfcampian), which, in the Manzano Mountains, consists of interbedded Kues, B.S., 2001, The Pennsylvanian System in New Mexico- overview with Base mapped, edited, and published by the Geological Survey. Control by USGS and USC&GS Mapping of this quadrangle was funded by a matching-funds grant from the STATEMAP program present just to the east of this N-S trending structure, one in the northern part of the map area 1:24,000 calcareous shale in some areas. The thickness of the Sandia Formation is variable, siliciclastic sediments with a few thin limestone interbeds. The Bursum Formation was probably Topography from aerial photographs by multiplex methods of the National Cooperative Geologic Mapping Act, administered by the U. S. Geological Survey, suggestions for revision of stratigraphic nomenclature: New Mexico (ESCABOSA) 1 0.5 0 1 MILE and by the New Mexico Bureau of Geology and Mineral Resou rces, (Dr. Peter A. Scholle, with an average thickness of about 45 m in the Sandia Mountains (Kelley and deposited as the last of the Pennsylvanian seas withdrew from the area, and is overlain by continental and the other two just south of the Bernalillo - Torrance county line. Limited exposures of Aerial photographs taken 1952. Field check 1954 Geology, v 23, p. 103-122. Director and State Geologist, Dr. Paul W. Bauer, Geologic Mapping Program Manager). Northrop, 1975) and ranging up to about 90 m in the Manzano Mountains (Myers, barite, fluorite, and calcite mineralization are present in the vicinity of the latter two E-W Polyconic projection. 1927 North American datum 1000 0 1000 2000 3000 4000 5000 6000 7000 FEET redbeds of the Permian Abo Formation. 10,000-foot grid based on New Mexico coordinate system, cental zone 1988). Pre-Sandia Formation (Mississippian (?)) sedimentary rocks in the map fault zones, and in Section 7, T. 9 N., R. 7 E. A zone of apparent hydrothermal alteration is Digital cartography by K. Glesener, M. M. Mansell, and D. J. McCraw New Mexico Bureau of Geology and Mineral Resources Myers, D.A., 1973, The upper Paleozoic Madera Group in the Manzano 1 0.5 0 1 KILOMETER area, if present, are included in the Sandia Formation in the accompanying cross Subdivision of the Madera Group in the Manzano Mountains was formalized by Myers (1973), who present in the northwestern part of the map area in Sections 6 and 7, T. 10 N., R. 7 E. that is New Mexico Tech Mountains, New Mexico: U.S. Geological Survey Bulletin 1372-F, 13 p. sections, with an assumed, overall thickness of the combined Sandia Formation elevated the Madera to group status and designated two formations within the Madera – the Los Moyos visible on aerial photographs as a linear, approximately N 15 W trending feature. Field CONTOUR INTERVAL 20 FEET 801 Leroy Place plus pre-Sandia strata of 45 m (~150 ft). limestone and the overlying Wild Cow Formation (Myers also included the Bursum Formation in the evidence for vertical displacement across this feature was not found and it is not mapped as NATIONAL GEODETIC VERTICAL DATUM OF 1929 Socorro, New Mexico Myers, D.A., 1988, Stratigraphic distribution of fusulinid foraminifera from Madera Group). The Los Moyos limestone and Wild Cow Formation generally correspond to the earlier fault. 87801-4796 the Manzano Mountains, New Mexico: U.S. Geological Survey 10° Proterozoic concept of lower gray limestone and upper arkosic limestone members of the Madera “Formation.” As Professional Paper 1446, 65 p. noted by Myers (1973), the Los Moyos and Wild Cow Formations are likely equivalent to the Gray The overall eastward dip of the Madera Group in the map area is modified by what appear [505] 835-5490 to be broad, low amplitude, roughly E-W trending folds. These undulations are expressed Xu Proterozoic crystalline rocks, undifferentiated (cross sections only). Mesa and Atrasado Members, respectively, of the Madera “Formation” as defined by Kelley and Wood Geology of Edgewood quadrangle, by latitudinal changes from NW striking to NE striking beds. Sub-vertical joint sets in New Mexico State Engineer, 1967, Thickness of alluvium, valley fill, and lake NEW MEXICO STATEMAP quadrangles are available exposed bedrock are common and orientations of joint traces (see rose diagram of joint deposits, Estancia underground water basin: Santa Fe, New Mexico State Engineer Office, Open-file Map, scale 1:126,720. TRUE NORT H Torrance and Santa Fe Counties, New Mexico for free downloads at: orientations) are similar throughout the map area. MAGNETIC NORTH http://geoinfo.nmt.edu Read, C.B., and others, 1944, Geologic map and stratigraphic sections of May 2000 (revised May 2003) Permian and Pennsylvanian rocks of parts of San Miguel, Santa Fe, QUADRANGLE LOCATION APPROXIMATE MEAN DECLINATION, 2003 by Sandoval, Bernalillo, Torrance, and Valencia Counties, north-central New Mexico: U.S. Geological Survey, Oil and Gas Investigations Bruce D. Allen Preliminary Map 21, scale approx. 1:190,000. New Mexico Bureau of Geology and Mineral Resources, Socorro, NM 87801 Geologic Cross Sections Smith, R.E., 1957, Geology and ground-water resources of Torrance County, A A' New Mexico: New Mexico Bureau of Mines and Mineral Resources, Comments to Map Users 8,000 8,000 feet ASL feet ASL Ground-water Report 5, 186 p. A geologic map displays information on the distribution, nature, orientation, and age relationships &wp of rock and deposits and the occurrence of structural features. Geologic and fault contacts are &wp &wp &wp &wp &wp irregular surfaces that form boundaries between different types or ages of units. Data depicted 7,000’ 7,000’ Titus, F.B., 1980, Ground water in the Sandia and northern Manzano &ws &ws &wp on this geologic quadrangle map may be based on any of the following: reconnaissance field Explanation of Map Symbols &ws &ws &wp Qp &ws Mountains, New Mexico: New Mexico Bureau of Mines and Mineral geologic mapping, compilation of published and unpublished work, and photogeologic interpretation. &m &m &s &m &m &s &ws Locations of contacts are not surveyed, but are plotted by interpretation of the position of a given &s &wp Resources, Hydrologic Report 5, 66 p. Location of geologic cross section. 6,000’ &m &s 6,000’ contact onto a topographic base map; therefore, the accuracy of contact locations depends on the A A' &m Xu &s scale of mapping and the interpretation of the geologist(s). Any enlargement of this map could cause Xu Xu Xu Geologic contact. Dashed line indicates approximate Xu misunderstanding in the detail of mapping and may result in erroneous interpretations. Site-specific Xu conditions should be verified by detailed surface mapping or subsurface exploration. Topogra phic location. 5,000’ 5,000’ and cultural changes associated with recent development may not be shown. 65 D Normal fault showing dip direction, ball-and-bar on U downthrown side. Solid where exposed, dashed where B Cross sections are constructed based upon the interpretations of the author made from geologic B' approximately known, dotted where concealed. “D” 8,000 8,000 mapping, and available geophysical, and subsurface (drillhole) data. Cross-sections should be used as feet ASL Arroyo de feet ASL an aid to understanding the general geologic framework of the map area, and not be the sole source indicates downthrown side of concealed fault; “U” &wp &wp &wp San Jose indicatesupthrown side. Tick indicates dip of fault &wp &wp Juan Tomas &wp &wp &wp &wp of information for use in locating or designing wells, buildings, roads, or other man-made structures. Canyon 7,000’ &ws &ws &ws 7,000’ plane. &ws &ws &ws The map has not been reviewed according to New Mexico Bureau of Geology and Mineral Resources 5 &m &m Strike and dip of inclined bedding. &m &m &s &s &m standards. The contents of the report and map should not be considered final and complete until &s &s &m &s reviewed and published by the New Mexico Bureau of Geology and Mineral Resources. The views and 6,000’ 6,000’ 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 Xu Xu Xu Xu Xu Xu the U.S. Government. Note: Faults shown as vertical where attitude is unknown. Arrows indicate relative vertical displacement. 5,000’ 5,000’