Features related to climate.______________________ Permafrost. ________________________________ Ground ice_______________________________ Microrelief features-________________________ Stratigraphy_______________________________________ Jurassic (?) and Cretaceous systems ______________ Siltstone and shale unit______________________ Torok formation and Nanushuk group un-differentiated____ _ ___-_-__-_-___________ Stratigraphic relations...____________________ Cretaceous system ______________________________ Lower Cretaceous series_____________________ Fortress Mountain formation.____________ Torok formation..._____________________ Lower and Upper Cretaceous series Nanushuk group ___________________________________ Kukpowruk formation..___-_________ Corwin formation______________________ Upper Cretaceous series Colville group______ Prince Creek formation__________________ Quaternary system..____________________________ Pleistocene and Recent._____________________ Arctic foothills province _________________ High-level terrace deposits_____-_-___ Low-level deposits-_____-_-_____-___ Arctic coastal plain province. ____________ Gubik formation.- .-_____-_____-__-Recent deposits..___________________ Coastal area west of Cape Beaufort.______ Petrography _______________________________________ Thin sections-__________________________________ PLATE 7. Index map of northwestern Alaska showing location of Utukok-Corwin region, physiographic provinces, and areas mapped from 1947 to 1953. 8. Geologic map of the Utukok-Corwin region, Alaska. 9. Generalized geologic map of the Utukok-Corwin region, Alaska. 10. Representative sections of the Kukpowruk and Torok formations. PLATE 11. Correlated generalized sections of Nanushuk group along the Kukpowruk River. 12. Correlated generalized sections of Nanushuk group along the Kokolik River. 13. Correlated generalized sections of Nanushuk group along the Utukok River. 14. Correlated generalized sections of Nanushuk group along approximate lat. 68°55' N. in 48 EXPLORATION OF NAVAL PETROLEUM RESERVE NO. 4, ALASKA, 1944-53 tive and 2 negative elements which strike east-northeast. Structural salients in 2 parts of the region may represent northeast-striking structural highs. The western structural province is characterized by northwest-striking thrust faults which alternate with southwestward-dipping sections or partial limbs of synclines. This structural pattern is the result of eastward-directed forces from the Tigara uplift, west of the area. Reflection seismic work has been done north of the Utukok River at the headwaters of the Kaolak River, and southward along the Utukok River into the southern foothills. Two areas that are structurally distinct are delineated within this region. They are separated by the major south-dipping and west-trending Carbon Creek thrust fault, which is believed to come to the surface within the Carbon Creek anticline. The northern or upper Kaolak River area includes the Torok, Kukpowruk, and Corwin formations. This shallow Cretaceous rock sequence is gently ...
Qa Alluvium (Holocene) Silt, sand, and granule-to boulder-sized material having minor amounts of organic debris, gray, yellowish-gray to brown, well -sorted and -stratified. Alluvium shows fining-upward cycles. Underlies active stream beds or floodplain, locally frozen in silty channels; includes placer-mine tailings on sections of Quail, Troublesome, Ophir, and Nome Creeks, streams in Livengood village area, and southeast of Chatanika River in Fairbanks mining district; 0.3 m to approximately 15 m thick.Qg Reworked creek gravels in placer mining areas (Holocene) Placer-mine tailings derived from buried stream gravels worked for gold by methods of pick and shovel, mechanized surface, underground drifting, or dredging methods; shown, as map scale permits, on Fairbanks and Livengood Creeks, elsewhere included in Qa. Commonly less than 9 m thick.Qab Abandoned or inactive flood plain deposits (Holocene) Silt, sand, granule-to pebblesize gray gravel, and organic material. Abandoned stream channels 0.6 to 4.5 m topographically higher than active channels of Qa, elsewhere flat to hummocky and many bogs. Includes small alluvial fans, deposited by minor side streams, and intermixed alluvial sediments and very silty natural stream levees from cyclical flooding of Minto Flats.Commonly frozen. As thick as 30 m. QdSand dune deposits (Holocene) Sand, moderate yellowish-brown, well-sorted, eolian. Grains 65 to 85 percent quartz, yellowish-white, clear to opaque, angular to round; dark gray to black rock fragments, chert, mica, traces of feldspar and light-colored rock fragments. Isolated dunes mostly covered by eolian silt and stabilized by vegetation. As thick as 9 m. QsSwamp deposits (Holocene) Humus, peat, and silt in poorly-drained areas having abundant stagnant water; generally frozen below a depth of about a meter; some small swampy areas included in units Qa, Qab, and Qsu. As thick as tens of meters. QafAlluvial fan deposits (Holocene) Sand, gravel, and boulders, gray to brown, poorly-to wellsorted and stratified, coarse-grained, rounded to angular; clasts locally-derived and deposited under high-energy conditions below major decrease in slope. Locally covered by reworked silt and small amount of vegetation. Thickness varies greatly; only largest alluvial fans shown on map. Qsu Silt, undifferentiated, contains reworked loess, swamp and organic-rich deposits (Holocene) Silt, pale yellowish brown, largely eolian, and in part, locally retransported to lower slopes and valley bottoms by alluvial and solifluctional processes. Local brown to grayish black organic rich layers, masses, and disseminated debris. Poorly drained and frozen as abundant horizontal and vertical sheets, wedges, and irregular masses of ground ice. Thickness ranges from 1 to 61 m. QIC Loess and colluvium Including minor upland alluvium (Holocene) Unsorted mixture of local bedrock fragments and loess, light-gray to brown, angular or subrounded; partially frozen, fairly well-drained, locally occurs as mixture of reworked loess and colluvium in drainage chan...
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