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Geologic Map of the Billings 30' X 60' Quadrangle, Montana

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Geologic Map of the Billings 30' X 60' Quadrangle, Montana MONTANA BUREAU OF MINES AND GEOLOGY GEOLOGIC MAP SERIES NO. 59 A Department of Montana Tech of The University of Montana Prepared in Cooperation with the U.S. Geological Survey and the U.S. Department of Energy National Petroleum Technology Office Billings 30' x 60' Quadrangle, Lopez 2000 A CORRELATION OF MAP UNITS DESCRIPTION OF MAP UNITS Qal Qal Alluvium (Holocene): Gravel, sand, silt, and clay along BEDROCK MAP UNITS active channels of rivers, creeks, and tributaries. Coarse, Lance Formation (Upper Cretaceous): Interbedded light- Kl Holocene well-rounded gravel restricted mainly to Pryor Creek and brownish gray, cliff and ledge-forming, fine-grained, thick- Qc Qaf Qls Yellowstone River drainages. Most sediment in tributary bedded to massive sandstone, medium-gray fissile shale, Qat1 drainages is sand, silt, and clay derived from local and a few thin beds of coal. Sandstone beds support Cretaceous sandstone and shale bedrock. growths of pine trees. In the Pompey's Pillar area, a thin section of Fox Hills Sandstone is included at the base of Qat Qat2 QUATERNARY Colluvium (Holocene and Pleistocene): Locally derived the Lance (Edith Wilde, Montana Bureau of Mines and Qc Geology, 1996, personal communication). Along the north- Qat3 slope-wash deposits mainly of sand, silt, and clay. Typically central margin of the quadrangle, beds mapped as Lance Pleistocene thin veneer concealing bedrock, but locally as thick as resemble the Hell Creek of other areas (Edith Wilde, Qat4 30 feet. Commonly grades into Qal. Locally contains well- Montana Bureau of Mines and Geology, 1996, personal rounded cobbles derived from alluvial terrace gravel. communication). Total thickness of the formation is about QTpg Qat5 Qst 350 feet. Qaf Alluvial fan deposits (Holocene and Pleistocene): Gravel, Tat Tst1 sand, silt, and clay deposited in fans being formed by Bearpaw Shale (Upper Cretaceous): Dark-gray shale, modern streams along major valley margins. Display Kb commonly weathering dark brownish-gray, fissile, Pliocene TERTIARY Tst2 characteristic fan-shaped map pattern and convex upward fossiliferous, brownish-gray calcareous concretions and profile. Typically grade upstream into Qal. Thickness nodules are common. Middle part of formation contains Unconformity ranges from very thin at toes to as much as 50 feet at numerous thin mostly greenish-gray bentonite beds; thin heads of fans. sandstone beds are common near the top. The thickness Kl is about 800 feet but thins westward to 200 to 300 feet. Kb Qls Landslide deposits (Holocene and Pleistocene): Unconsolidated mixture of soil and blocks of bedrock Kjr Judith River Formation (Upper Cretaceous): Interbedded Kjr transported down steep slopes by mass wasting; locally brownish-gray sandy shale and light-brown to pale yellowish-brown argillaceous, very fine to fine-grained Kcl consist of internally cohesive, rotated slump blocks. lenticular sandstone in beds up to 10 ft thick. Locally a Characteristic hummocky surface with concentric swales massive cliff-forming sandstone, resembling those in the Ke and ridges near downslope limits. Common along steep Eagle Sandstone, occurs at the base and is commonly Upper slopes beneath the Eagle Sandstone, Judith River correlated with the Parkman Sandstone. Sandstones Ktc Cretaceous Formation, and along steep slopes underlain by friable to moderately well indurated, cross-bedded, and Cretaceous shales, but can occur where slope and Kn burrowed to bioturbated and support growths of pine CRETACEOUS moisture content produce unstable conditions. Numerous trees. In the western part of the quadrangle, greenish- Kca small slides and some with minor amounts of downslope gray and pale maroon-gray mudstones and easily eroded displacement (R.B. Colton, U.S. Geological Survey, 1995, sandstones occur near the top of the formation. The Kgr written communication) are not shown because of bedrock thickness ranges from 250 to 350 feet because of emphasis of this map. lenticularity of the sandstones and eastward regional Kbf thinning. Pediment gravel deposits (Pleistocene and Pliocene?): Km QTpg Claggett Shale (Upper Cretaceous): Brownish-gray fissile Angular and subangular coarse gravel derived from local Kcl bedrock, mostly limestone, form smooth surfaces sloping shale with minor interbeds of light brownish-gray, very Ktf argillaceous sandstone. Light brownish-gray to light- Lower away from the Pryor and Big Horn mountains. About 10 Unconformity brown, calcareous concretions common, usually Cretaceous to 30 feet thick. fossiliferous. The upper contact is gradational and Kk conformable and is placed at the change to ledge-forming ALLUVIAL TERRACE GRAVELS sandstones of the Judith River Formation. Thickness of Qat1 Alluvial gravel, terrace level 1 (Holocene and the formation is 100 to 400 feet thinning westward. Pleistocene): Gravel underlying terraces about 10 to 20 feet above present altitude of Yellowstone River. Mostly Eagle Sandstone (Upper Cretaceous): Light brownish- cobbles and pebbles with minor amounts of sand and Ke gray to very pale-orange very fine to fine-grained, cross- MAP SYMBOLS silt. Clasts are mainly granitic igneous rocks, granitic bedded sandstone, burrowed to bioturbated in part. Locally gneiss, schist, and quartzite, with much less limestone contains calcareous, light-brown sandstone concretions and sandstone. Twenty to 40 feet thick (Gosling and up to 15 feet in diameter. Up to four sandstone intervals Contact: Dashed where approximately Pashley, 1973). 10 to 50 feet thick can be present with intervening sandy located, dotted where concealed shale as thick as 50 feet. Ranges from 100 to 350 feet because of lensing of sandstone intervals. Qat2 Alluvial gravel, terrace level 2 (Pleistocene): Gravel underlying terraces about 20 to 40 feet above present elevation of Yellowstone River. Mostly cobbles and pebbles Ktc Telegraph Creek Formation (Upper Cretaceous): Shale Fault: Dashed where approximately and sandy shale, brownish-gray to medium dark-gray located, dotted where concealed, queried with minor amounts of sand and silt. Clasts are mainly with thin, interbedded sandstone. Dusky-red concretions where uncertain, bar and ball on granitic igneous rocks, granitic gneiss, schist, and quartzite, common near base. Sandstone beds thicker and more downthrown side. Several faults have been with much less limestone and sandstone. Forty to 60 feet abundant upward, grading into Eagle Sandstone. Contact reactivated at different times and show thick (Gosling and Pashley, 1973). with Eagle is placed at the base of the first cliff-forming vertical and strike-slip displacements sandstone. Maximum thickness about 150 feet. Qat3 Alluvial gravel, terrace level 3 (Pleistocene): Gravel underlying terraces about 50 to 90 feet above present Niobrara Shale (Upper Cretaceous): Shale, olive-gray Horizontal beds altitude of Yellowstone River. Mostly cobbles and pebbles Kn and dark brownish-gray, fissile, and contains abundant with minor amounts of sand and silt. Clasts are mainly thin bentonite beds. Upper half calcareous, containing few very thin bentonite beds, and near top contains thin 32 Strike and dip of inclined beds granitic igneous rocks, granitic gneiss, schist, and quartzite, with much less limestone and sandstone. This deposit beds of very calcareous-laminated sandstone, siltstone, grades from about 20 to 30 feet at its southern edge to and sandy limestone. Concretions medium light-gray to about five feet at its northern limit (Gosling and Pashley, pale yellowish-brown and from a few inches to one or Anticline: Showing trace of axial plane 1973), where it is overlain by colluvium and alluvial fan two feet in diameter commonly present. Inoceramus and direction of plunge, dotted where deposits of silty clay. prisms common. Upper contact placed at change from concealed calcareous shales to non-calcareous shales of Telegraph Creek. Zone of dusky-red concretions in Telegraph Creek Qat4 Alluvial gravel, terrace level 4 (Pleistocene): Gravel just above contact also helps establish its position. Basal underlying terraces about 200 to 300 feet above present contact is placed below ledge-forming zone of closely Syncline: Showing trace of axial plane altitude of Yellowstone River. These terraces locally exhibit spaced, fossiliferous gray septarian concretions with veins and direction of plunge, dotted where a relatively steep gradient toward the Yellowstone River brown calcite. In the Billings area about 700 feet thick. concealed valley and may actually include several levels of terraces that are difficult to distinguish. Cobble- and pebble-size Kca Carlile Shale (Upper Cretaceous): Shale, dark-gray to clasts are mainly granite, granitic gneiss, schist, and dark bluish-gray fissile. Interval about mid-section contains quartzite. Thickness up to about 20 feet. laminae and thin beds of argillaceous, platy, light brownish- Monocline: Showing axial plane trace of gray to light olive-gray sandstone that locally supports growth of pine trees, but otherwise nearly bare of soil anticlinal flexure and direction of plunge; Qat5 Alluvial gravel, terrace level 5 (Pleistocene): Gravel dashed where approximately located, dotted underlying terraces about 400 to 500 feet above present and vegetation. Septarian nodules and concretions where concealed; shorter arrow on more altitude of Yellowstone River. Occur mainly as small, common, ranging from light-gray to dark yellowish-orange. steeply dipping limb discontinuous erosional remnants. Cobble- and pebble- Approximately 250 to 300 feet thick. size
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