National Park Service Geologic Map of Grand Canyon National Park U.S. Department of the Interior Geologic Resources Inventory Arizona Natural Resource Stewardship and Science Volcanic rocks of the Mount Floyd Volcanic Field, basalt and Park Boundary Qhb Basalt of Hancock Knolls, basalt flows (Pleistocene) Tmi Basalt of Mount Trumbull, intrusive rocks (Pliocene) Tiba TRmm Moenkopi Formation, middle red member (Lower Triassic) Dox Formation, Comanche Point andesite dikes, plugs, and necks (upper Miocene) Ydc Qspd Sage Basalt, pyroclastic deposits (Pleistocene) Tmb Basalt of Mount Trumbull, basalt flows (Pliocene) TRmv Moenkopi Formation, Virgin Limestone Member (Lower Triassic) Member (Mesoproterozoic) Volcanic rocks of the Hualapai Plateau, pyroclastic deposits Dox Formation, Solomon Temple Qsb Sage Basalt, basalt flows (Pleistocene) Tigw Basalt of the Grand Wash Trough, dikes and necks (Pliocene) Tc TRml Moenkopi Formation, lower red member (Lower Triassic) Yds (Miocene) Member (Mesoproterozoic) Qidn Basalt dikes and necks (Pleistocene) Tbgw Basalt of the Grand Wash Trough, basalt flows (Pliocene) TRmt Moenkopi Formation, Timpoweap Member (Lower Triassic) Volcanic rocks of the Hualapai Plateau, andesite flows and basalt Dox Formation, Escalante Creek Tv Yde Infrastructure Qpyr Pyroclastic deposits (Pleistocene) Tgs Gravel and sedimentary deposits (Pliocene to lower Paleocene(?)) flows, undivided (Miocene) Pk Kaibab Formation, undivided (Lower Permian) Member (Mesoproterozoic) Point of interest Qism Intrusive dikes of Shadow Mountain (Pleistocene) Volcanic rocks of the San Francisco Volcanic Field, young intrusive Volcanic rocks of the Mount Floyd Volcanic Field, basalt Pkh Kaibab Formation, Harrisburg Member (Lower Permian) Shinumo Sandstone, undivided Tyi Tba and andesite flows (upper Miocene) Ys City Qsp Pyroclastic deposits of Shadow Mountain (Pleistocene) rocks (Pliocene) Pkf Kaibab Formation, Fossil Mountain Member (Lower Permian) (Mesoproterozoic) Volcanic rocks of the San Francisco Volcanic Field, young Volcanic rocks of the Hualapai Plateau, basalt flow of Hakatai Shale, undivided Road Qsbf Basalt flows of Shadow Mountain (Pleistocene) Typ Tbfn Pt Toroweap Formation, undivided (Lower Permian) Yh pyroclastic deposits (Pliocene) Nelson (middle to lower Miocene) (Mesoproterozoic) Qpyd Pyroclastic deposits (Pleistocene) Ptw Toroweap Formation, Woods Ranch Member (Lower Permian) Volcanic rocks of the San Francisco Volcanic Field, young basalt Ti Volcanic rocks of the Hualapai Plateau, intrusive dikes (Miocene) Tyb Yb Bass Formation (Mesoproterozoic) Faults Qbf Basalt flows (Pleistocene) flows (Pliocene) Horse Spring Formation, Rainbow Gardens Member Toroweap Formation, Brady Canyon and Seligman Members, Ths Ptb Diabase intrusive rocks Qbt Basalt flow of Tappan Wash (Pleistocene) (Miocene and Oligocene) undivided (Lower Permian) Ydi (( (( (( (( Thrust fault, known or certain Twi Whitmore Dike Swarm, intrusive dikes (Pliocene) (Proterozoic) Old gravel and sedimentary deposits (lower Miocene, Pts Toroweap Formation, Seligman Member (Lower Permian) Qbfl Fissure deposits of Lockett Tank (Pleistocene) Twb Whitmore Dike Swarm, basalt flow (Pliocene) TKs1 Young granite and pegmatite Reverse fault, known or certain, dotted where concealed Oligocene, Eocene, Paleocene, and Upper Cretaceous) Pc Coconino Sandstone (Lower Permian) Yg Qbmp Pyroclastic deposits (Pleistocene) Tpki Basalt of Poverty Knoll, intrusive dike (Pliocene) (Proterozoic) : : : Normal fault, known or certain, dashed where approximate, Ts Sedimentary rocks (lower Eocene and upper Paleocene) Ph Hermit Formation (Lower Permian) Qbmb Basalt flows (Pleistocene) Tpkb Basalt of Poverty Knoll, basalt flow (Pliocene) Xg Granite (Paleoproterozoic) short-dashed where inferred, dotted where concealed Oldest gravel and sedimentary deposits (Paleocene(?) TKs2 Pe Esplanade Sandstone (Lower Permian) Granite, granitic pegmatite and Qsfp Pumice of San Francisco Mountain (Pleistocene) Tpi Poverty Mountain Basalt, intrusive neck (Pliocene) and Upper Cretaceous) Xgr High-angle fault, known or certain, dashed where Esplanade Sandstone and Pakoon Limestone, undivided (Lower aplite (Proterozoic) Qmbi Basalt dike (Pleistocene) Tpp Poverty Mountain Basalt, pyroclastic deposits (Pliocene) Pep approximate, dotted where concealed Kp Quartz monzonite pluton (Upper Cretaceous) Permian) Granodiorite-gabbro-diorite and Folds Qmp Pyroclastic deposits (Pleistocene) Tpb Poverty Mountain Basalt, basalt flows (Pliocene) Km Mancos Shale (Upper Cretaceous ) Wescogame Formation, Manakacha Formation, and Watahomigi Xgd granodiorite complexes PNMs (Proterozoic) a Dome Qmb Basalt flows (Pleistocene) Tgi Grassy Mountain Basalt, intrusive dikes (Pliocene) Kd Dakota Sandstone (Upper Cretaceous ) Formation, undivided (Pennsylvanian and Upper Mississippian) Ultramafic rocks Qmlp Basalt flow of Lava Point (Pleistocene) Tgp Grassy Mountain Basalt, basalt flows (Pliocene) Jms Morrison Formation, Salt Wash Member (Upper Jurassic) Ms Surprise Canyon Formation (Upper Mississippian) Xum Anticline, known or certain, dashed where (Paleoproterozoic) # Qslr Rhyolite dome complex of Slate Mountain (Pleistocene) Tgb Grassy Mountain Basalt, pyroclastic deposits (Pliocene) Mr Redwall Limestone, undivided (Mississippian) F approximate, dotted where concealed Jr Romana Sandstone (Middle Jurassic) Diorite, gabbro, and anorthosite Qbcr Basalt flows along the Colorado River (Pleistocene) Xdg Tay Alluvium and calcrete soil deposits (Pliocene and Miocene) Je Entrada Sandstone (Middle Jurassic) Dtb Temple Butte Formation (Upper and Middle Devonian) (Proterozoic)

# Syncline, known or certain, dotted where concealed Basalt of the Uinkaret Plateau, intrusive rocks, south of Mount Trumbull M Qi Tao Alluvial deposits (Pliocene and Miocene) Jc Carmel Formation, undivided (Middle Jurassic) Cm Muav Limestone (Middle Cambrian) Xs Schist (Proterozoic) (Pleistocene) Rocks of the Grand Wash Trough, red siltstone, sandstone, and Carmel Formation, Paria River Member and Winsor Member Cba Bright Angel Shale (Middle Cambrian) Monocline, known or certain, dashed where Basalt of the Uinkaret Plateau, intrusive rocks, north of Mount Trumbull Tgr Jcu Xv Vishnu Schist (Proterozoic) # Qi1 conglomerate facies (Pliocene and Miocene) undivided (Middle Jurassic) S approximate, dotted where concealed (Pleistocene) Ct Tapeats Sandstone (Middle and Lower(?) Cambrian) Rama Schist and Gneiss Tbpb Black Point Basalt flows (Pliocene) Carmel Formation, Judd Hollow Tongue and Page Sandstone Xr Linear Dikes Basalt of the Uinkaret Plateau, pyroclastic deposits, south of Mount Trumbull Jcj Zs Sixtymile Formation, undivided (Neoproterozoic) (Paleoproterozoic) Qp Tongues, undivided (Middle Jurassic) (Pleistocene) Tscd Old stream-channel deposits (Pliocene and Miocene) Zkw Kwagunt Formation, Walcott Member (Neoproterozoic) Xbr Brahma Schist (Paleoproterozoic) Ydi - Diabase intrusive rocks (Proterozoic), known or certain Jp Page Sandstone (Middle Jurassic) Basalt of the Uinkaret Plateau, pyroclastic deposits, north of Mount Trumbull Tocb Basalt flow of Cedar Ranch Mesa (Miocene) Zion National Park Zka Kwagunt Formation, Awatubi Member (Neoproterozoic) Mafic metavolcanic rocks Volcanic Line Features Qp1 Jn Navajo Sandstone (Lower Jurassic) Xm (Pleistocene) Tsi Shivwits Basalt, intrusive rocks (Miocene) Zkcb Kwagunt Formation, Carbon Butte Member (Neoproterozoic) (Proterozoic) Crater, known or certain Basalt of the Uinkaret Plateau, basalt flows, south of Mount Trumbull Basalt of the Shivwits Plateau, pyroclastic deposits Kayenta Formation and Navajo Sandstone transition zone Orthoamphibole schist Qb Tsp Jkn Zgd Galeros Formation, Duppa Member (Neoproterozoic) Xo Flow direction line, known or certain (Pleistocene) (Miocene) (Lower Jurassic) (Proterozoic) Zgcc Galeros Formation, Carbon Canyon Member (Neoproterozoic) Basalt of the Uinkaret Plateau, basalt flows, north of Mount Trumbull Jk Kayenta Formation, undivided (Lower Jurassic) Xc Carbonate and chert (Proterozoic) Geologic Units Qb1 Tsb Shivwits Basalt, basalt flows (Miocene) (Pleistocene) Jks Kayenta Formation, Springdale Sandstone Member (Lower Jurassic) Zgj Galeros Formation, Jupiter Member (Neoproterozoic) Crystalline rocks, undivided Water T227i-277 Mile intrusive (Miocene) Xu Qkrp Basalt of Kenworthy Ranch, pyroclastic deposits (Pleistocene) Moenave Formation and Wingate Sandstone, undivided (Lower Zgt Galeros Formation, Tanner Member (Neoproterozoic) (Proterozoic) Tbmi Blue Mountain Basalt, dikes and necks (Miocene) Jm Qaf Artificial fill and quarries (Holocene) Qkrb Basalt of Kenworthy Ranch, basalt flows (Pleistocene) Jurassic and Upper Triassic(?)) Nankoweap Formation, undivided (Neoproterozoic to latest Elves Chasm pluton Tbmb Blue Mountain Basalt, basalt flows (Miocene) YZn Xec Qs Stream-channel deposits (Holocene) Jmw Moenave Formation, Whitmore Point Member (Lower Jurassic) Mesoproterozoic) (Paleoproterozoic) Qmrp Basalt of Marshall Ranch, pyroclastic deposits (Pleistocene) Dikes of Parashant Canyon and Hundred and Ninetysix Mile Creek Qf Floodplain deposits (Holocene) Tp6i Yi Unnamed diabase sills and dikes (Mesoproterozoic) Qmrb Basalt of Marshall Ranch, basalt flows (Pleistocene) (Miocene) Jmd Moenave Formation, Dinosaur Canyon Member (Lower Jurassic) Yc Cardenas Basalt (Mesoproterozoic) Qd Dune sand and sand sheet deposits, undivided (Holocene) Qp6375 Basalt of hill 6375, pyroclastic deposits (Pleistocene) T2i Dikes of Colorado River Mile 202 (Miocene) TRc Chinle Formation, undivided (Upper Triassic) Yd Dox Formation (Mesoproterozoic) Qes Sand sheet deposits (Holocene) Qb6375 Basalt of hill 6375, basalt flows (Pleistocene) Tsgi Snap Point Basalt and Garrett Dikes, intrusive dikes (Miocene) TRco Chinle Formation, Owl Rock Member (Upper Triassic) Glen Canyon National Ydo Dox Formation, Ochoa Point Member (Mesoproterozoic) Qc Colluvial deposits (Holocene) Qp6646 Basalt of hill 6646, pyroclastic deposits (Pleistocene) Tsgb Snap Point Basalt and Garrett Dikes, basalt flows (Miocene) TRcp Chinle Formation, Petrified Forest Member (Upper Triassic) Recreation Area Page Qdl Linear dune deposits (Holocene) Qb6646 Basalt of hill 6646, basalt flows (Pleistocene) Rocks of the Grand Wash Trough, paleozoic-clast conglomerate TRcs Chinle Formation, Shinarump Member (Upper Triassic) Tgc Qdp Parabolic dune deposits (Holocene) (Miocene) Moenkopi Formation, undivided (Upper(?), Middle(?) and Lower Qp6457 Basalt of hill 6457, pyroclastic deposits (Pleistocene) TRm Qdb Barchan dune deposits (Holocene) Rocks of the Grand Wash Trough, limestone and siltstone facies Triassic) Sheet 4 Qb6457 Basalt of hill 6457, basalt flows (Pleistocene) Tgl (Miocene) Moenkopi Formation, upper red member (Middle(?) and Lower Qlsp Little Spring Basalt, pyroclastic deposits (Holocene) Qpvp Basalt of Potato Valley, pyroclastic deposits (Pleistocene) TRmu Rocks of the Grand Wash Trough, gypsum and gypsiferous Triassic) Qlsb Little Spring Basalt, basalt flows (Holocene) Tgg Qpvb Basalt of Potato Valley, basalt flows (Pleistocene) siltstone facies (Miocene) TRms Moenkopi Formation, Shnabkaib Member (Lower Triassic) Qdm Mixed dune deposits (Holocene) Qp6588 Basalt of hill 6588, pyroclastic deposits (Pleistocene) Tgx Proterozoic-clast conglomerate facies (Miocene) TRmw Moenkopi Formation, Wupatki Member (Lower Triassic) Qdlu Linear dune and sand sheet deposits, undivided (Holocene) Jacob Lake Qb6588 Basalt of hill 6588, basalt flows (Pleistocene) Volcanic rocks of the San Francisco Volcanic Field, basalt flow of Moenkopi Formation, lower red member, Virgin Limestone Trb TRmlm Qg1 Young terrace-gravel deposits (Holocene and Pleistocene) Qcbi Basalt of Craigs Knoll and Berry Knoll, intrusive dikes or necks (Pleistocene) Red Butte (Miocene) Member, and middle red member, undivided (Lower Triassic) Qtgr Terrace gravel deposits (Holocene and Pleistocene) Volcanic rocks of the Mount Floyd Volcanic Field, rhyolite, rhyoda- Qcbp Basalt of Craigs Knoll and Berry Knoll, pyroclastic deposits (Pleistocene) Tri cite, and obsidian dikes, necks, and vent areas (upper Miocene) Qg2 Intermediate terrace-gravel deposits (Holocene and Pleistocene) Qcbb Basalt of Craigs Knoll and Berry Knoll, basalt flows (Pleistocene) Sheet 2 Volcanic rocks of the Mount Floyd Volcanic Field, rhyolite, Qg3 Old terrace-gravel deposits (Holocene and Pleistocene) Tr Qg4 Older terrace-gravel deposits (Pleistocene) rhyodacite, and obsidian flows (upper Miocene) Qa1 Young alluvial fan deposits (Holocene and Pleistocene) QTwb Basalt flows of Woodhouse Mesa (Pleistocene or Pliocene) Qa Alluvial deposits (Holocene and Pleistocene) QTi Hells Hole dikes (Pleistocene or Pliocene(?)) North 0 40 Kilometers Grand Canyon National Park Qa2 Intermediate alluvial fan deposits (Holocene and Pleistocene) QTd Old dune deposits, undivided (Pleistocene and Pliocene(?)) Qr Colorado River gravel and silt deposits (Holocene and Pleistocene) QTdl Old linear dune deposits (Pleistocene and Pliocene(?)) Qgy Young alluvial terrace deposits (Holocene and Pleistocene) QTdp Old parabolic dune deposits (Pleistocene and Pliocene(?)) 0 40 Miles Qay Young alluvial fan deposits (Holocene and Pleistocene) QTes Old eolian sand sheet and dune deposits (Pleistocene and Pliocene(?)) Qa3 Old alluvial fan deposits (Holocene, Pleistocene and Pliocene(?)) QTg Terrace-gravel deposits (Pleistocene and Pliocene(?)) Qps Ponded sediments (Holocene and Pleistocene(?)) QTae Old mixed alluvium and eolian deposits (Pleistocene and Pliocene(?)) Qae Mixed alluvium and eolian deposits (Holocene and Pleistocene(?)) QTa4 Older alluvial fan deposits (Pleistocene and Pliocene) Qss Sand sheet deposits (Holocene and Pleistocene(?)) QTgd Old gravel deposits (Pleistocene, Pliocene, and middle Miocene) Qscf Eolian and fluvial silt deposits (Holocene and Pleistocene(?)) QTg4 Older terrace-gravel deposits (Pleistocene and Pliocene(?)) Qv Valley-fill deposits (Holocene and Pleistocene) QTg5 Youngest old terrace-gravel deposits (Pleistocene, Pliocene and Miocene) NAVAJO INDIAN Qt Travertine deposits (Holocene and Pleistocene) Qg5-18 Oldest terrace-gravel deposits, undivided (Pleistocene and Pliocene(?)) RESERVATION Qtr Talus and rock-fall deposits (Holocene and Pleistocene) QTg6 Intermediate old terrace-gravel deposits (Pleistocene and Pliocene(?)) Ql Landslide deposits (Holocene and Pleistocene) QTg7 Oldest old terrace-gravel deposits (Pleistocene and Pliocene(?)) Qgo Older alluvial terrace deposits (Holocene(?) and Pleistocene) Volcanic rocks of the San Francisco Volcanic Field, intrusive dike or plug QTisf Qsd Silt dune deposits (Holocene and Pleistocene) (Pleistocene or Pliocene) Volcanic rocks of the San Francisco Volcanic Field, pyroclastic deposits Qdc Eolian cinder dune deposits (Holocene and Pleistocene) QTpsf Qsc Eolian cinder sand sheet deposits (Holocene and Pleistocene) (Pleistocene or Pliocene) Volcanic rocks of the San Francisco Volcanic Field, basalt flows (Pleistocene Qltb Basalt of Larimore Tank, basalt flows (Pleistocene) QTbsf or Pliocene) Sheet 3 Meadview Tusayan This map displays geologic map data compiled Qlp Little Tanks Basalt, pyroclastic deposits (Pleistocene) Volcanic rocks of the San Francisco Volcanic Field, basalt and andesite dikes QTai HUALAPAI INDIAN Qlb Little Tanks Basalt, basalt flows (Pleistocene) and necks (Pleistocene or Pliocene) Lake Mead National by the National Park Service Geologic Resources Inventory. Qhkp Heaton Knolls Basalt, pyroclastic deposits (Pleistocene) Volcanic rocks of the San Francisco Volcanic Field, basalt and andesite Recreation Area RESERVATION QTap It is not a substitute for site-specific Qhkb Heaton Knolls Basalt, basalt flows (Pleistocene) pyroclastic deposits (Pleistocene or Pliocene) Volcanic rocks of the San Francisco Volcanic Field, basalt and andesite flows investigations. Qgrp Basalt of Graham Ranch, pyroclastic deposits (Pleistocene) QTab (Pleistocene or Pliocene) Source Scale 1:24,000 Qgrb Basalt of Graham Ranch (Pleistocene) Thma Andesite flows of Howard Mesa (Pliocene) Sheet 1 According to US National Map accuracy standards, Qmcb Basalt flow of Merriam Crater (Pleistocene) Tbi Dike in ampitheater (Pliocene) features are within 12 m (40 ft) of their true location. Qyap Pyroclastic deposits of S P Mountain (Pleistocene) Billingsley, G.H., and Priest, S.S. 2013. Geologic Billingsley, G.H., Priest, S.S., and Felger, T.J. 2008. Billingsley, G.H., Block, D.L., and Dyer, H.C. 2006. Billingsley, G.H., and Wellmeyer, J.L. 2004. Geologic Tp Pyroclastic deposits (Pliocene) Poster Layout Qyab Basaltic andesite of S P Mountain (Pleistocene) Map of the Glen Canyon Dam 30' x 60' Geologic Map of the Fredonia 30' x 60' Quadrangle, Geologic Map of the Peach Springs 30' x 60' Map of the Mount Trumbull 30' X 60' Quadrangle, Tb Basalt flows (Pliocene) Chase Winters, Dalton Meyer Source Map Date Qyp Pyroclastic deposits of five young cinder cones (Pleistocene) Quadrangle, Coconino County, Arizona Mohave and Coconino Counties, Northern Arizona Quadrangle, Mohave and Coconino Counties, Mohave and Coconino Counties, Northwestern Tei Basalt north of Mount Emma, intrusive rocks (Pliocene) (scale 1:000,000). Scientific Investigations (scale 1:00,000). Scientific Investigations Map Northwestern Arizona (scale 1:100,000). Scientific Arizona (scale 1:100,000). Geologic Investigations and Jake Suri 2000, ‘04, ’06, Qyb Basalt flow of five young cinder cones (Pleistocene) Tep Basalt north of Mount Emma, pyroclastic deposits (Pliocene) Map SIM-3268. U.S. Geological Survey. SIM-3035. U.S. Geological Survey. Investigations Map SIM-2900 U.S. Geological Survey. Series Map I-2766. U.S. Geological Survey. (Colorado State University) ‘07, ’08, ‘12, ‘13 Qtid Tuckup Canyon Basalt, intrusive dikes (Pleistocene) Teb Basalt north of Mount Emma, basalt flows (Pliocene) Billingsley, G.H., Stoffer, P.W., and Priest, S.S. Billingsley, G.H., Priest, S.S., and Felger, T.J. 2007. Billingsley, G.H., Felger, T.J., and Priest, S.S. 2006. Billingsley, G.H., and Hampton, H.M. 2000. Geologic Poster Date GRI Data Date Qtp Tuckup Canyon Basalt, pyroclastic deposits (Pleistocene) Tmlb Basalt of Mount Logan, basalt flows (Pliocene) 2012. Geologic Map of the Tuba City 30' x Geologic Map of the Cameron 30' x 60' Geologic Map of the Valle 30' x 60' Quadrangle, Map of the Grand Canyon 30' X 60' Quadrangle, September 2020 2013 Qtb Tuckup Canyon Basalt, basalt flow (Pleistocene) Source Map Tbid Basalt of Bundyville, intrusive dikes (Pliocene) 60' Quadrangle, Coconino County, Arizona Quadrangle, Coconino County, Northern Arizona Coconino County, Northern Arizona (scale Coconino and Mohave Counties, Northwestern All Geologic Resources Inventory geologic Qhp Basalt of Hancock Knolls, pyroclastic deposits (Pleistocene) (scale 1:50,000). Scientific Investigations (scale 1:100,000). Scientific Investigations Map 1:100,000). Scientific Investigations Map SIM-2895. Arizona (scale 1:100,000). Geologic Investigations map data and publications are available Tbb Basalt of Bundyville, basalt flows (Pliocene) Map SIM-3227. U.S. Geological Survey. SIM-2977. U.S. Geological Survey. U.S. Geological Survey. Series Map I-2688. U.S. Geological Survey. at http://go.nps.gov/gripubs