U.S. DEPARTMENT OF THE INTERIOR SCIENTIFIC INVESTIGATIONS MAP 2998 U.S. GEOLOGICAL SURVEY Version 1.0 CORRELATION OF MAP UNITS Pamphlet accompanies map D' A65 Qac SURFICIAL DEPOSITS SEDIMENTARY ROCKS Tbr Qac Qsc Qac Qcb Tcd Qt2s VOLCANIC, INTRUSIVE, AND SEDIMENTARY ROCKS LIST OF MAP UNITS ၧcu Je ၣcu B Qac Je Te Ta Ta Qrc Qfp Qsc Qay Qac Qe Qae Qcb Holocene 10 7 Trc ၣcu 11 Trc ALLUVIUM, COLLUVIUM, EOLIAN, TALUS, AND LANDSLIDE DEPOSITS Qcb Qsc/Qay Qt2s Side-stream channel deposits of ancestral Rio Chama (Pleistocene) 20 20 Qac Je 3 Qcb/Ta Qls 68 Te Te 10 Holocene and Je 5 Jt Je Qt2s Qt2s Qrc Main stream channel of modern Rio Chama (historic) CAÑONES Te 14 Ttc Qt2 Axial channel and side-stream channel deposits of ancestral Rio Chama, undivided 12 ၣ (TERRACE) Pleistocene FAULT 20 40 80 cu 3 5 (Pleistocene) 7 Qfp Floodplain of modern Rio Chama (historic) Je 12 6 14 Qt6 Te Qac 27 5 Qt3s Jt 12 2 14 Qt1s Side-stream channel deposits of ancestral Rio Chama (Pleistocene) Qac Te 10 Qsc Side-stream channel deposits (Holocene) 10 15 Ta Qt5a Qt5s Qt5 Qcb/Ttc QUATERNARY Qay INTRUSIVE, EXTRUSIVE, AND SEDIMENTARY ROCKS 45 Qt5s Qt4s 12 Young alluvium in Rio Chama valley bottom and north of Rio Chama (Holocene) ၣcu Qt4s Qt4a Qt4s Qt4 15 Qsc/Qay Pleistocene Qac Alluvium and colluvium (Holocene) Ttd Dacite of Tschicoma Formation (Pliocene) Je Qt3a Qt3s Qt3 9 5 Ta 24 Teb El Alto Basalt (Pliocene) Qsc Qt5s Qe Eolian sand (Holocene) Tcd Qsc/Qay Qt2a Qt2s Qt2 Trc Qsc/Qay 4 Qt3 Qae Alluvium and eolian sand (Holocene) Tlb Lobato Basalt (Miocene) 11 Ttc Qt1s Qsc Qsc Ta 9 Qcb Colluvium deposits predominately of basaltic clasts (Holocene) Tbb Basaltic dike of Barranca (Miocene?) 10 7 6 17 Qt3s 5 Ttd 10 65 Ta Tcd Trc 18 Pliocene Qls Landslide deposits (Holocene and Pleistocene) Cerrito de la Ventana dike (lower Miocene) Qt5s Tcd T L 75 Teb Qt4s AU Tbr O F 5 Qt4s Basaltic dike of Red Wash Canyon (lower Miocene) 16 AD Qsc/Qay 5 Ta OR 4 4 16 Tlb AXIAL CHANNEL AND SIDE-STREAM CHANNEL DEPOSITS OF C OL Ttcv Qt5s 33 C 17 ANCESTRAL RIO CHAMA SEDIMENTARY ROCKS 10 Qcb 16 ZA Ttc 11 Ttc Qt3s 17 LA Tbb Ta P 10 Qac Tesque Formation of the Santa Fe Group Qt5a 7 ? 14 Qac 3 Qt6 Axial channel and side-stream channel deposits of ancestral Rio Chama, undivided 82 10 T Ttc Qsc Ttc Ttc (Pleistocene?) Tto Ojo Caliente Sandstone Member (upper to middle Miocene) Qt4s 23 37 Ttoc 10 Qsc UL Qt4s 8 Miocene A TERTIARY F Qt5a Qt6 Ta 6 Trc ? 3 Axial channel deposits of ancestral Rio Chama (Pleistocene) Ttc Chama-El Rito Member (middle to lower Miocene) 84 Qsc C' Qac 14 Qt4s 10 CIA 10 25 Ttoc Tto Qt5s Side-stream channel deposits of ancestral Rio Chama (Pleistocene) Ttcv R A23 Qsc/Qay Volcaniclastic unit of Chama-El Rito Member (middle to lower Miocene) A Ttoc 16 G Qt5a Ttc Ttcv Qt5 Axial channel and side-stream channel deposits of ancestral Rio Chama, undivided Ttoc Transitional zone of Ojo Caliente Sandstone and Chama-El Rito Members Qsc/Qay Ttc Qt5a Qsc Qac ? Lower Miocene and (Pleistocene) (upper to middle Miocene) Qsc/Qay Tcd Tbr Ta 60 50 Upper Oligocene 8 Qt4s Ttcv Qt5a 45 Qt4a Axial channel deposits of ancestral Rio Chama (Pleistocene) Ta Abiquiu Formation (lower Miocene to upper Oligocene) 15 Trc Oligocene 6 A113 A, B, C Qrc Qfp Qt4a Qcb ? Qt4s Side-stream channel deposits of ancestral Rio Chama (Pleistocene) Trc Ritito Conglomerate (Oligocene) 5 Te Eocene Qsc/Qay Qt6 35 Qt4 Axial channel and side-stream channel deposits of ancestral Rio Chama, undivided Te El Rito Formation (Eocene) Qt6 Qt5s 56 LT Qfp U (Pleistocene) Qac Ta FA Qfp Jt 5 T 30 Jt Todilto Limestone Member of Wanakah Formation (Middle Jurassic) Ta L Qrc Qt3a Axial channel deposits of ancestral Rio Chama (Pleistocene) 7 5 U Ttoc Qsc A Middle Jurassic JURASSIC Je F N Entrada Sandstone (Middle Jurassic) Ta YO Qt3s Side-stream channel deposits of ancestral Rio Chama (Pleistocene) 45 N Qrc ABIQUIU CA Je ၣcu 6 Qfp Chinle Group, undivided (Upper Triassic) O FAULT Qsc Qt3 Axial channel and side-stream channel deposits of ancestral Rio Chama, undivided Qe C A Qay ၦၢ ၧ N R cu 12 E (Pleistocene) Cutler Group, undivided (Late Pennsylvanian to Early Permian) A D L A Qsc ၣ

? cu TRIASSIC B Upper Triassic Qfp 40 M Qt2a ၦၢ Qrc Axial channel deposits of ancestral Rio Chama (Pleistocene) Paleozoic and Mesozoic rocks, undivided (Paleozoic to Upper Triassic) Qrc Qt5 Qfp 2 Qay ? Qay Qt6

O Qt5a Qsc T Qsc Late Pennsylvanian PENNSYLVANIAN

I ၧcu A R and Permian AND PERMIAN

Qay R Qt5a Qt5a

E Abiquiu Inn C Qt3s ? ? Qay Ttc Qt4a 15 Qt3 Qt4a Qls 7 10 25 Tto Qcb Ttc 15 Qt3 Qfp Qt2a Ttc 7 60 Qls Qt4 Qt3 Qt5a 6 A13 ? 9 Qac A A' Tcd Qrc Ttoc ? Qay Qls Qt2 METERS FEET Ta Ta Qac Qay MESA DE ABIQUIU Qt5a Qt5a Qt2 Qls Qcb Qt3 INTERSECTION Ttoc WITH D–D' Qsc Qac 5 Teb Teb Ta 30 ABIQUIU FAULT Teb Qcb/Tto Tcd Teb Qsc Qsc Qcb/Tto 7000 11 Tto Qcb Qsc Tto 2000 Ttoc Tto Qcb Qac Qcb Qcb Qac Qcb Tcd? Qt2a ? Qls Tbb Qcb/Tto Qsc Tto Qsc 30 Qcb Qay Qsc Qt3a Qsc Qcb Qt3a Ttoc Qcb Qcb/Ttc Qsc Qac Qac Qsc Qac Qt2s Qae Ttc Ta Qls 18 Qls Ta 6000 Qac Qt2a Ta ? 35 Qsc ABIQUIU FAULT Tbb Trc Trc Trc T ? Qsc ? L 45 Ttc Qls? U Tto 10 Tto Ttc Tto 6 Ttc 1500 5000 Qt2 32 Qac Te Te Tbb AFA 2 10 Te Qcb/Tto ANC Qcb Qt3 Ttoc R R Qt2 Qac Ta Ta BA Qcb Qcb/Tto 8 Tto Tcd 4000

? Qcb ၦၢ Tbb Tto Qt2a ၦၢ Trc Trc Ta ? Qac Qt1s Qt2 1000 12 Qcb 13 3000 Ttoc Ta Qt1s Qcb 9 Te Te Tto Qac ? 12 Qsc ? ၦၢ Ttd/Ta Thickness of Quaternary units and Qcb/Tto are exaggerated. Paleozoic and Mesozoic units combined as . 57 Qsc Ttd/Ta Qac Qcb 4 ? Teb Ttc Ttd 8 Tcd? Qcb Tto Qae 9 Qcb Qcb/Tto Qcb/Tto Tto ? Qcb Tlb ? B B' Qac ? METERS FEET Tto CERRITO BLANCO ? Qcb MESA DE ABIQUIU Qac Qcb 5 CAÑONES FAULT INTERSECTION GARCIA FAULT ABIQUIU FAULT WITH C–C' Teb INTERSECTION 7000 Qae Qcb Qcb CERRITO BLANCO Qls WITH D–D' Te CERRITO DE LA VENTANA FAULT 2000 Qsc/Qay Qcb/Ttc Qsc Qcb Qcb Ttd Qt4s Ttoc Qcb Qac Tto Tto Qcb Tto Trc Qac Qsc Qrc Ttc Qfp Qfp Qay 6000 Qsc ? Ta Qay Qsc Ta Te Ta ? Trc Tto ? Tcd Ta Teb Ttc Qcb Qcb Trc Trc Ttc 5000 1500 Te Trc Ttc Te Te Tlb Qls Qac Ta Qe/Tlb Te Ta Qac? Qcb ၦၢ 4000 Trc ၦၢ Qcb/Tto Qcb Trc Ta Qcb Qsc B' 1000 Te ၦၢ Te Te ၦၢ Trc 3000 Qls ၦၢ Tlb Qcb Qsc Teb Qe/Teb Qae Thickness of Quaternary units are exaggerated. Paleozoic and Mesozoic units combined as ၦၢ. Qcb Qcb/Tto Qcb Tto? ? Qsc Qae Qac A' Qcb/Tto? Qac Qsc Qcb INTERSECTION EXPLANATION ? Tto WITH B–B' Teb Qsc Contact—Queried where uncertain; dotted where concealed; dashed where approximately C C' located. Contacts between bedrock and surficial deposits approximately located 75 METERS FEET Tlb Normal fault—Bar and ball on downthrown side; dashed where approximately located; Qcb INTERSECTION dotted where concealed; queried where uncertain; arrows indicate amount and ? Qae GARCIA FAULT WITH D–D' 7000 direction of movement

Qcb 2000 Qcb Qsc/Qay Low-angle fault (Abiquiu fault)—Dashed where mostly concealed and approximately located Qt5s Qcb Ttoc Qt4s Qt4s Qt4s Q4ts Qsc Ttoc Qsc/Qay Qt4s Qsc/Qay Qsc/Qay Qsc Qt4s Qsc/Qay Syncline Qae Trc Qsc/Qay Qac ? Ta Qac 6000 Teb Qcb/Tto? Trc Ta Strike and dip of sedimentary beds Ttc 5 Ttd Te Trc Ttc Inclined ? Te Trc Qcb/Tto Ta Qae 1500 Ta 5000 Horizontal ? Tcd Te Trc Incipient fissure (scarp) of gravity-slide block at Mesa de Abiquiu Qcb Trc A48 Sample location D Qcb Te 4000 Qae Tlb ၦၢ Te Qe/Teb Veneer of younger unit (Qe, Qcb, or Qsc) covering older unit (second symbol varies) ၦၢ Qae Qac ? 1000 Qae ၦၢ Qae Qcb/Ttc Tto 3000 ? ၦၢ Qcb/Tto Undivided units due to poor exposures ? Tto Qac Thickness of Quaternary units are exaggerated. Paleozoic and Mesozoic units are combined as ၦၢ.

? Qac ? Qcb Ttd A189 A48 Qcb/Tto ? Qcb Tlb ? ?

? ? D D' Teb Qae ? 15 Qcb ? Qsc METERS FEET 2500 Qae Ttc LOBATO MESA

?

? ? 5 Tlb Qcb/Ttc Qsc Qac? Qcb/Tto Teb INTERSECTION INTERSECTION INTERSECTION Qae Tlb? ? Qsc WITH A–A' WITH B–B' WITH C–C' Qac Qcb/Tto Qac Qae Qcb Tto ? 2000 RIO CHAMA ? Qac Tlb Qsc Qcb Qsc/Qay Qt2s 9 Qcb Qcb Qcb Qt2 Qcb Qac Qay Qrc Qt4s Tto Qay Qfp Qsc/Qay Qsc/Qay Ta Tto Ttc Ttc 6000 Trc Ta Base from U.S. Geological Survey, 1953; 9° SCALE 1:24 000 Geology mapped by Florian Maldonado in 2004–2006 1500 Ta Te photorevised, 1979 1 1/ 2 0 1 MILE 5000 NEW Digital database prepared by Darren R. (Paco) Van Sistine Ta Trc Polyconic projection MEXICO Editing and digital cartography by Trc 10,000-foot grid based on New Mexico 1.50 1 KILOMETER Gayle M. Dumonceaux, Te coordinate system, central zone TRUE NORTH Trc ၦၢ MAGNETIC NORTH Denver Publishing Service Center Te 4000 1,000-meter Universal Transverse Mercator QUADRANGLE LOCATION CONTOUR INTERVAL 20 FEET 1000 ၦၢ grid ticks, zone 13 APPROXIMATE MEAN Manuscript approved for publication Te ၦၢ DECLINATION, 2008 NATIONAL GEODETIC VERTICAL DATUM OF 1929 1927 North American Datum December 20, 2007 Thickness of Quaternary deposits and compound units are exaggerated. Paleozoic and Mesozoic units combined as ၦၢ.

Te

Ttoc

ၢ Ta

Photograph 1. Photograph showing Santo Tomás Church, Abiquiu Plaza Photograph 2. Photograph showing Rio Chama with Cerrito Blanco Photograph 3. Photograph showing Tertiary unit (Te) overlying Mesozoic Photograph 4. Photograph showing Abiquiu Formation, north of Abiquiu Photograph 5. Photograph showing Mesozoic rocks with Cerro Pedernal Photograph 6. Photograph showing Rio Chama, northeast of Abiquiu Photograph 7. Photograph showing pedestal rock, northwest of Abiquiu (view looking north). (Shiprock) in background (view looking north). rocks (ၢ), upper reaches of Arroyo del Cobre (view looking southwest). (view looking southwest). in background, upper reaches of Arroyo del Cobre (view looking southwest). (view looking east). (view looking south). Unit Ttoc on unit Ta.

CONVERSION FACTORS Any use of trade names is for descriptive purposes only and does not imply endorsement by the U.S. Government Multiply By To obtain This map was produced on request, directly from centimeters (cm) 0.394 inches (in.) digital files, on an electronic plotter meters (m) 3.281 feet (ft) For sale by U.S. Geological Survey Information Services GEOLOGIC MAP OF THE ABIQUIU QUADRANGLE, RIO ARRIBA COUNTY, NEW MEXICO kilometers (km) 0.621 miles (mi) Box 25286, Federal Center, Denver, CO 80225 1-888-ASK-USGS To convert Celsius (°C) to Fahrenheit (°F), use formula (°C x 1.8) + 32 ARCInfo coverages and PDF files for this map are available at By http://pubs.usgs.gov Suggested citation: Maldonado, Florian, 2008, Geologic map of the Abiquiu Florian Maldonado quadrangle, Rio Arriba County, New Mexico: U.S. Geological Survey Scientific Investigations Map 2998, 2008 1 sheet, scale 1:24,000, 1 pamphlet, 21 p.