Scientific Investigations Map 3247 U.S. Department of the Interior Prepared in cooperation with the Sheet 3 of 3 U.S. Geological Survey Navajo Nation Pamphlet accompanies map CORRELATION OF MAP UNITS LIST OF MAP UNITS

SURFICIAL DEPOSITS [See Description of Map Units (in pamphlet) for complete unit descriptions. Quaternary and Tertiary units are positioned only to indicate their general stratigraphic relations] SEDIMENTARY ROCKS Qaf Qs Qf Qps Qd Qes Qdl Qdp Qdb Qa1 Qg1 Qf1 Qa2 Qg2 Qf2 Qf3 Qae Qsd Qg3 Holocene Qv Qa3 Qtr Ql Bidahochi Formation (Pliocene and Miocene) QUATERNARY SURFICIAL DEPOSITS Qg4 Pleistocene Tbl Qaf Lower mudstone and argillaceous sandstone member (Miocene) QTd QTes QTa QTg4 QTdi Artificial fill and quarries (Holocene) QTs Pliocene TERTIARY Km Mancos Shale (Upper Cretaceous) Qs Stream-channel deposits (Holocene) Kd Dakota Sandstone, undivided (Upper Cretaceous) Qf Modern flood-plain deposits (Holocene) VOLCANIC ROCKS CENOZOIC Glen Canyon Group (Jurassic) Qps Ponded sediments (Holocene) Volcanic rocks of Hopi Buttes Jk Kayenta Formation (Lower Jurassic) Ti Tc Tm Tmt Tmu Miocene TERTIARY (Tsezhin Bii) Volcanic Field Qd Dune sand and sand-sheet deposits (Holocene) Jm Moenave Formation (Lower Jurassic) Qes Eolian sand-sheet deposits (Holocene) Jms SEDIMENTARY ROCKS Upper sandstone member (Lower Jurassic) Qdl Linear-dune deposits (Holocene) Tbl Chinle Formation (Upper Triassic) Miocene TERTIARY Qdp Parabolic-dune deposits (Holocene) ^co Owl Rock Member (Upper Triassic) Unconformity Qdb Barchan-dune deposits (Holocene) Km ^cp Petrified Forest Member (Upper Triassic) Upper Cretaceous CRETACEOUS Qa1 Young alluvial fan deposits (Holocene) Kd ^cs Shinarump Member (Upper Triassic) Unconformity Qg1 Young terrace-gravel deposits (Holocene) Moenkopi Formation (Middle? and Lower Triassic) Jk Qf1 Young flood-plain deposits (Holocene) ^mhm Holbrook and Moqui Members, undivided (Middle? and Lower Triassic) Unconformity Lower Jurassic JURASSIC Qa2 ^mss Jm Intermediate-age alluvial fan deposits (Holocene) Lower massive sandstone member (Lower Triassic) Jms Qg2 Intermediate-age terrace-gravel deposits (Holocene) Pk Kaibab Formation (Cisuralian) 111°00' 110°30' 110°00' MESOZOIC Unconformity Qf2 Pc 35°30' Intermediate-age flood-plain deposits (Holocene) Coconino Sandstone (Cisuralian) ^co Qf3 Old flood-plain deposits (Holocene) ^cp Upper Triassic Qae Mixed alluvium and eolian deposits (Holocene) ^cs EXPLANATION OF MAP SYMBOLS NNEWBERRYEWBERRY MESAMESA TOLANI LAKE MONTEZUMAS MONTEZUMAS CHAIR SHONTO BUTTE DILKON NA AH TEE CANYON INDIAN WELLS TRIASSIC CHAIR NW Unconformity Qsd Silt-dune deposits (Holocene) Contact—Contacts between all alluvial and eolian units are approximate and ^mhm Middle(?) and arbitrary Lower Triassic Qg3 Old terrace-gravel deposits (Holocene) Fault—Dashed where inferred or approximately located; dotted where concealed; ^ms Lower Triassic 35 Qv Valley-fill deposits (Holocene and Pleistocene?) bar and ball on downthrown side. Number is estimated fault separation, in Unconformity meters Qa3 Old alluvial fan deposits (Holocene and Pleistocene) Pk Folds—Showing trace of axial surface and direction of plunge; dashed where Unconformity Cisuralian PERMIAN PALEOZOIC Qtr Talus and rock-fall deposits (Holocene and Pleistocene) approximately located; dotted where concealed Pc Anticline OOLDLD LLEUPPEUPP EAST OF OOLDLD LLEUPPEUPP BIRD SPRINGS WASH ELEPHANT BUTTE CHIMNEY BUTTE FRENCH BUTTE SUNFLOWER BUTTE FIVE BUTTES Ql Landslide deposits (Holocene and Pleistocene)

Qg4 Older terrace-gravel deposits (Pleistocene) Plunging anticline—Showing direction of plunge

QTd Old sand-dune deposits (Pleistocene and Pliocene?) Syncline 35°15' QTes Old eolian sand-sheet and dune deposits (Pleistocene and Pliocene?) Plunging syncline—Showing direction of plunge QTa Older alluvial fan deposits (Pleistocene and Pliocene?) Monocline

TUCKER MESA NW TUCKER MESA NE WINSLOW NW WINSLOW NE STANDING HORSE ROTTEN BANANAS TURKEY TRACK BUTTE MITTEN PEAK QTg4 Oldest terrace-gravel deposits (Pleistocene and Pliocene?) MESA BUTTE Dome QTdi “Dilkon deposits” (Pleistocene? and Pliocene?) Strike and dip of beds QTs “Shonto deposits” (Pleistocene? and Pliocene) 40 Inclined bedding—Showing strike and dip where measured in the field

VOLCANIC ROCKS Implied bedding—Showing approximate strike as interpreted from aerial photo- Volcanic rocks of Hopi Buttes (Tsezhin Bii) Volcanic Field (Miocene) graphs; dip amount not determined Ti Intrusive dikes, plugs, or necks (Miocene) Strike of vertical and subvertical joints—Interpreted from aerial photographs; TUCKER MESA SW TUCKER MESA WINSLOW RINCON RANCH HUMPY CAMP WELL BLAIRS SPRING LEE MOUNTAIN HENNESSY BUTTES symbol placed where joints are most visible on aerial photographs Tc Volcanic-crater sedimentary rocks (Miocene) Collapse structure—Showing circular collapse structure characterized by strata Tm Mafic monchiquite and basanite flows (Miocene) dipping inward toward a central point Sinkhole—Enclosed depression or cave. Sinkholes breached by drainages are not Tmt 35°00' Mafic tuff-and-ash deposits (Miocene) shown INDEX MAP SHOWING 7.5′ QUADRANGLES IN WINSLOW 30′ × 60′ QUADRANGLE, NORTHERN ARIZONA Tmu Mixed monchiquite and basanite flows and tuff deposits, undivided (Miocene) Volcanic vent

Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government This map was printed on an electronic plotter directly from digital files. Dimensional calibration may vary Geologic Map of the Winslow 30’ x 60’ Quadrangle, Coconino and Navajo Counties, Northern Arizona between electronic plotters and between X and Y directions on the same plotter, and paper may change size due to atmospheric conditions; therefore, scale and proportions may not be true on plots of this map. For sale by U.S. Geological Survey, Information Services, Box 25286, Federal Center, Denver, CO 80225, By 1–888–ASK–USGS Digital files available at http://pubs.usgs.gov/sim/3247/ Suggested Citation: Billingsley, G.H., Block, D., and Hiza Redsteer, M., 2013, Geologic map of the Winslow George H. Billingsley, Debra Block, and Margaret Hiza Redsteer 30’ x 60’ quadrangle, Coconino and Navajo Counties, northern Arizona: U.S. Geological Survey Scientific Investigations Map 3247, pamphlet 25 p., 3 sheets, scale 1:50,000, available at 2013 http://pubs.usgs.gov/sim/3247/.