Geologic Map of the Roy 7.5' Quadrangle Weber And
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UTAH GEOLOGICAL SURVEY Plate 1 a divison of Utah Geological Survey Miscellaneous Publication MP-05-03 Utah Department of Natural Resources Geologic Map of the Roy 7.5' Quadrangle Qsm Qal1 Qsm Qal Qal Qal2 1 B 1 B' Qsm Qsm Qsm Qal1 Qsm Qal2 Qal2 Qsm Qsm Qal1 Qd2 Qd2 Qsm Qsm Qsm Qal1 G Qal2 Qd5 Qsm Qsm Qsm G Qal2 Qd Qdm 4 Qal2 Qd Qd1 1 Qal Qd2 Qsm 2 G Qd5 Qsm Qdm Qdm Qaf Qal3 Qd4 Qd4 Qdm Qd1 G Qd1 Qsm Qd3 Qd Qac Qdm Qdm 1 Qsm Qdm Qd5 U D Qd G Qsm Qal4 5 Qdm Qaf Qd1 Qd5 Qdm Qdm Qd1 Qac Qd Qd5 4 Qdm Qla G Qsm ? Qsm Qd Qsm 5 Qsm Qdm Qd1 Qaf Qsm Qd5 Qsm Qsm Qsm Qd5 Qdm Qsm Qda Qd4 Qd5 Qd4 G Qsm Qd Qsm 5 Qd3 Qaf Qaf Qd5 Qdm Qsm Qsm Qdm Qsm Qsm Qsm Qdm Qsm Qd5 Qsm Qd6 Qdm Qsm Qd1 Qla Qsm Qsm G Qsm Qsm Qdm Qsm Qsm Qsm Qsm Qda Qsm Qda Qd1 Qaf Qd4 Qdm U D Qsm Qd Qaf Qdm 1 G Qsm Qaf Qsm Qsm Qd6 Qaf Qdm Qsm Qaf Qaf Qd4 ? Qsm Qac Qlf G Qsm Qsm Qd3 Qat1 Qdm Qda Qaf Qaf Qd7 Qsm Qd4 Qda Qsm Qsm Qaf Qda Qat Qsm 2 Qaf Qaf Qsm Qlf G Qsm Qsm Qsm Qat3 Qaf Qac Qsm Qlf Qsm Qlf Qsm Qaf Qsm Qlf Qlf Qlf Qaf Qat Qat Qat 1 8 7 Qac G Qlf Qsm Qlf Qac Qsm Qat Qd8 5 Qat6 Qla Qal2 Qlf Qls Qaf Qlf Qd4 Qla Qac Qlf/Qd4 Qlf Qaf Qat8 Qat1 Qaf Qaf Qac Qac U D Qaf Qla Qal1 ? Qaf Qlf Qac Qaf Qlf Qat4 Qat2 Qac Qaf Qd9 Qal2 Qlf Qat Qac 3 Qaf Qaf Qd10 Qla Qla Qac Qlf Qaf Qd13 Qlf Qlf Qac Qlf/Qd G Qlf 4 Qlf Qd13 Qaf Qla Qaf Qaf Qms Qlf Qlf Qlf Qlf/Qd4 Qla Qlf/Qd4 Qla Qla Qla Qaf Qlf/Qd4 Qac Qlf Qla Qaf Qlf Qlf Qd11 Qlf Qlf Qaf Qlf/Qd4 G Qla Qla Qlf Qla Qaf Qac Qlf Qaf Qlf Qal1 Qlf Qac Qaf Qaf Qlf Qaf Qlf G Qlf Qla Qsm Qlf Qaf Qat9 Qac Qsm Qaf Qlf/Qd4 Qlf/Qd4 Qaf Qsm Qsm G Qlf Qla Qls/Qd13 Qaf Qlf Qaf Qaf Qaf Qlf Qal Qla 1 Qsm U D G Qla/Qd13 Qaf Qd12 ? Qlf/Qd4 Qls/Qd13 Qaf Qls/Qd Qla 13 Qd13 G Qla Qaf A Qlf Qd13 LH A' Base from U.S. Geological Survey, Grant C. Willis, Program Manager Roy 7.5' quadrangle, 1990 Douglas A. Sprinkel, Project Manager SCALE 1:24,000 James Parker, Cartographer 1 0.5 0 1 MILE Although this product represents the work of professional scientists, the Utah Department of 1000 0 1000 2000 3000 4000 5000 6000 7000 FEET Natural Resources, Utah Geological Survey, makes no warranty, expressed or implied, regarding its 1 0.5 0 1 KILOMETER suitability for a particular use. The Utah Department of Natural Resources, Utah Geological Survey, shall not be liable under any circumstances CONTOUR INTERVAL 5 FEET for any direct, indirect, special, incidental, or NATIONAL GEODETIC VERTICAL DATUM OF 1929 consequential damages with respect to claims by users of this product. 13°18' UTAH 236 mils GEOLOGIC MAP OF THE ROY 7.5' QUADRANGLE WEBER AND DAVIS COUNTIES, UTAH QUADRANGLE LOCATION 2005 MAGNETIC DECLINATION AT CENTER OF SHEET by Dorothy Sack 2005 UTAH GEOLOGICAL SURVEY Plate 2 a division of Utah Geological Survey Miscellaneous Publication MP-05-3 Utah Department of Natural Resources Geologic Map of the Roy 7.5' Quadrangle DESCRIPTION OF MAP UNITS Sand-dominated deltaic deposits from late in Lake Bonneville's Late Tertiary basin fill - Weakly to strongly consolidated mixture CORRELATION OF MAP UNITS Qd5 post-Provo regression - Sandy mud through gravelly sand Tb of conglomerate, sandstone, mudstone, tuffaceous sandstone, probably deposited between about 12.2 and 12.1 ka. Thickness tuff, and lacustrine limestone. Shown only on cross sections. Quaternary Surficial Deposits varies from 1 to 35 feet (0.3-10.7 m). Thickness up to 7,000 feet (2,042 m). 0 Undifferentiated alluvium and colluvium - Wash-reworked mass Sand-dominated deltaic deposits from the early and middle Bedrock Qdm Qd1 Qac wasting deposits and intertonguing alluvium and colluvium. Qd -Qd Qal 6 11 post-Provo regressive phase of Lake Bonneville - Primarily Tintic Quartzite - Main part of formation consists of cliff- 1 Poorly sorted fines through cobble-sized clasts deposited from fine and medium sand, crossed by channel deposits of gravel -Ct forming, white to tan, thin- to thick-bedded, quartz-rich, well- about 13.2 ka to present. Thickness probably less than 12 or sand and gravel, deposited in six discrete delta components cemented sandstone (orthoquartzite) with some lenses of feet (3.7 m). (6 = youngest) between about 14.0 and 12.2 ka. Maximum quartz-pebble conglomerate and thin layers of argillite; argillite Alluvial-fan deposits - Predominantly sandy fine-grained thicknesses range from 50 to 125 feet (15-38 m). intervals increase in abundance and quartz pebbles decrease Qaf 5 sediment deposited from about 13.2 ka to present. Thickness Deltaic sand of Provo shoreline age - Sand-dominated sediments in abundance toward the top of the formation; basal part of probably less than 10 feet (3 m). Qd12 deposited between about 14.5 and 14.0 ka. Estimated the formation consists of heterogeneous mixture of green to Qms Qsm Holocene Qal Qac Qaf 2 Qda Qla Late Holocene channel and flood-plain alluvium - Well to poorly maximum thickness is 75 feet (23 m). purple to tan, arkosic sandstone, quartz-pebble conglomerate, Qal1 sorted fines to gravel deposited from about 3.3 ka to the Deltaic sand from the transgressive phase of Lake Bonneville and micaceous siltstone. Shown only on cross section. present. Thickness probably less than 10 feet (3 m). Qd13 - Sand-dominated sediments deposited between about 27.5 Thickness ranges from about 1,300 to 1,500 feet (400-500m). Great Salt Lake Qd and 20.4 ka. Estimated maximum thickness is 30 to 40 feet Farmington Canyon Complex, undivided - Metamorphic and 2 Early to middle Holocene channel and flood-plain alluvium - Xf Qal2 Fine sandy mud to gravel deposited between about 9.4 and (9-12 m). igneous rocks of Early Proterozoic age. Shown only on cross 10 3.3 ka. Thickness 3 to 10 feet (1-3 m). Undifferentiated lacustrine and alluvial deposits - Fluvially section. Thickness unknown. Qd3 Qla Qal3 Qd Channel and flood-plain alluvium of very latest Pleistocene age reworked lake sediments and intermingled lake and alluvial- Stacked Geologic Units 4 Qal3 - Muddy to pebbly sand deposited from about 12.0 to 10.3 fan deposits. Sandy fines through gravelly sand deposited Qat Stacked geologic units - Mapped where surficial deposits are 1- Qd - ka. Approximately 7 feet (3 m) thick. from about 12.6 ka to the present. Thickness generally less Qls/Qd13 thinly distributed over other surficial deposits; example is of Qal4 Qat9 Qd5 6 Qls than 10 feet (3 m). Qd11 Channel alluvium of pre-Gilbert shoreline age - Mixed fine- lacustrine sand deposits thinly distributed over Lake Bonneville Qal 4 grained to pebbly mixed fine-grained sediment deposited Fine-grained lacustrine deposits - Mixed fine-grained sediment, transgressive-phase deltaic sand deposits. C yr B.P.) Qlf Qd12 Qlf 15 14 generally with a sand component, deposited by Lake Bonneville from about 12.1 to 12.0 ka. Estimated thickness is 3 feet (1 3 m). and Great Salt Lake between about 27.5 to 2.0 ka. Thickness probably less than 10 feet (3 m). Fluvial terrace deposits - Mud to gravel deposited between Qat1-Qat9 about 13.2 and 12.0 ka in nine discrete terraces (1 = youngest) Lacustrine sand - Sand-dominated sediments deposited between Regressive LATE QUATERNARY LATE Qls AGE (10 that range from 15 to 125 feet (5-38 m) thick. about 12.4 and 12.1 ka during the regressive phase of Lake Bonneville. Thickness probably less than 15 feet (4.6 m). GEOLOGIC SYMBOLS Undifferentiated deltaic and alluvial deposits - Sand-dominated Qda fine-grained deltaic deposits washed downslope by small- Slump deposits - Predominantly gravelly silt and gravelly fine 20 Qms sand deposited from about 12.0 ka to present. Estimated scale fluvial processes from about 12.2 ka to present. Estimated Contact maximum thickness is 6 feet (1.8 m). maximum thickness is 30 feet (9 m). Marsh deposits - Wet, fine-grained, organic-rich sediments in Late Pleistocene Deltaic mud - Predominantly silt and clay deposited since about U Qdm Qsm association with springs, ponds, and seeps. Deposited from ? Concealed fault; identified from seismic data; D on 0.4 ka. Thickness probably less than 3 feet (1 m). D Lake Bonneville about 12.1 ka to present. Thickness probably less than 5 feet downthrown side and U on upthrown side; query Qd13 Late Holocene fine-grained deltaic deposits - Muddy to sandy (1.5 m). Transgressive Qd1 indicates approximate position at surface fines deposited since about 0.4 ka. Thickness probably less 25 than 10 feet (3 m). Undifferentiated surficial deposits - Represents surficial deposits Qu along the line of cross section; includes alluvium, colluvium, Early Holocene fine-grained deltaic deposits - Muddy to sandy deltaic, and lacustrine deposits. Shown only on cross section. G Qd2 Gilbert shoreline of Great Salt Lake fines deposited between about 9.7 and 9.4 ka. Estimated Thickness generally less than 400 feet (122 m) thickness 10 to 20 feet (3-6 m). Basin Fill Fine-grained deltaic deposits of approximately Gilbert shoreline LH A late Holocene high shoreline of Great Salt Lake Qd3 age - Muddy to sandy fines deposited between about 11.0 Quaternary basin fill - Weakly to unconsolidated mixture of Qb and 10.3 ka.