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Geologic Map of the Lamont Quadrangle, Fremont and Teton

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Geologic Map of the Lamont Quadrangle, Fremont and Teton IDAHO GEOLOGICAL SURVEY DIGITAL WEB MAP 166 MOSCOW-BOISE-POCATELLO IDAHOGEOLOGY.ORG PHILLIPS, GARWOOD, AND FEENEY CORRELATION OF MAP UNITS GEOLOGIC MAP OF THE LAMONT QUADRANGLE, FREMONT AND TETON COUNTIES, IDAHO Artificial Alluvial Sediments Glacial Mass Wasting Eolian Volcanic Rocks and Fill Deposits Deposits Sediments Sediments m Qas Qac Qab Qabi HOLOCENE William M. Phillips, Dean L. Garwood, and Dennis M. Feeney Qls Qt Qafbn Qgo Qel 2014 ? Qd ? ? QUATERNARY PLEISTOCENE Qgo Qgo/Qyh Qba Qyh Qgo/Qyh Qbbc Qgo/Qyh Qgo/Qyh Qyh Qac Qyh Qgo/Qyh 395686 Qgo/Qbbc Qas Tb SYMBOLS Ts PLIOCENE Qas TERTIARY Qyh Qas ? Qas Contact: dashed where approximately located. Thr Qac MIOCENE Normal fault: ball and bar on downthrown side; dashed where approximately located; dotted where concealed. ? Qgo/Qbbc Monocline, arrow shows direction of dip. Qgo/Qyh Qyh Basaltic volcanic vent, concealed by loess. Qas present. In Bitch Creek canyon (center, sec. 18, T. 7 N., R. 45 E.), consists of nantly a bedrock-floored creek; the only significant alluvial reach is 405619 Qyh Flow line: Linear flow feature in basalt, concealed by loess; arrow shows >45 m (150 ft) of blocky pink eutaxitic rhyolite capped with a lithophysal 405619 flow direction. between the Highway 33 bridge and the Ashton-Tetonia railroad trestle. zone, a platy zone, a black vitrophyre, and a thin red vitric tuff. Maximum Qac Alluvium of Conant Creek (Holocene-Late Pleistocene)—Cobbles and exposed thickness in map is about 150 m (490 ft) in Bitch Creek canyon Strike and dip of eutaxitic foliation in welded tuff. 3 boulders up to 1.5 m (4.9 ft) in length; contained in braided channels and (SE/4 sec. 10, T. 7 N., R. 44 E.). At the Highway 33 bridge over Bitch Creek (NW 1/4 sec. 17, T. 7 N., R. 45 E.), > 30 m (100 ft) of Member A is exposed Qas Landslide scarp. two levels of terraces; well-rounded, crudely parallel bedded and imbri- cated. Clasts are composed of sandstone, quartzite, diorite, basalt, welded in the canyon and overlain by blocky pinkish-gray densely welded rhyolite 72513-21 Geochemical sample. tuff, granite, gabbro, and hornblende porphyry. Largest boulders consist of of Member B at road level. A normal fault places Member C in contact with Qas Member B. Member C consists of altered reddish to yellow unwelded Qas very hard, gray aphyric basalt with quartz xenocrysts, and lithophysal rhyo- 13P05 Qgo/Qyh Paleomagnetic sample. lite. Thickness ranges from 3 to 5 m (10 to 16 ft). air-fall deposits and altered orange to yellow low density welded tuff with abundant cavities, capped with a black vitrophyre (Wilson, personal R Fluxgate measurement site showing magnetic polarity. Qt Terrace deposits (Holocene-Late Pleistocene)—Silt and fine sand; thinly communication, 2014). Qas bedded with nearly horizontal tops. Incised by active channels. May repre- 374593 Water well showing Well ID number. sent reworked loess trapped in temporary lake created by landslide block- age of lower Swanner Creek in sec. 18, T. 7 N., R. 45 E. Thickness is about Tb Basalt (Pliocene?)—Not exposed in the map area; known only from subsurface 3 m (10 ft). information. Basalt encountered in water well logs stratigraphically below Qgo/Qbbc METHODS AND PREVIOUS WORK the Huckleberry Ridge Tuff. For example, well 358104 in sec. 24, T. 7 N., R. Qgo Glacial outwash deposits (Late-Middle Pleistocene)—Boulders, cobbles, 44 E. penetrates 96 m (316 ft) of basalt below Qyh. This basalt may be pebbles, and sand; generally well-rounded; composed dominantly of basalt correlative to basalts lying below Qyh that are exposed in the Teton River with lesser gneiss, sandstone, and quartzite derived from the Teton Range. Qgo/Qyh This map depicts the bedrock and surficial geology of the Lamont quad- canyon in the Newdale quadrangle (Phillips, and others, 2011). Qas Qgo Water wells indicate thickness of about 8 to 9 m (25 to 30 ft). Best rangle. Previous work by Prostka and Hackman (1974), Mitchell and Ts Sediments (Pliocene?)—Not exposed in the map; known only from subsurface Qas Qas Bennett (1979), and Scott (1982) were consulted and compiled. The map of exposures are at Highway 33 bridge over Bitch Creek where about 1.5 m (5 Qas information. Silt, clay, and gravel encountered in water well logs Love and others (1992) was used to infer sources for gravels derived from ft) of sandy gravel overlies a reddish paleosol, and in road cuts along Highway 33 between Bitch Creek and Lamont. Overlain in most exposures stratigraphically below the Huckleberry Ridge Tuff. For example, well 327679 the Teton Range. Water well logs from the Idaho Department of Water 358104 in sec. 24, T. 7 N., R. 44 E. penetrates 13 m (42 ft) of silt, clay, and Resources (IDWR, 2014) were used, where possible, to trace bedrock units by >1 m (>3 ft) of loess. Age and correlation with regional glacial periods Qel are uncertain. Lobes of the Yellowstone ice cap lay just north of the map gravel about 91 m (300 ft) below Qyh. The sediments may be correlative to concealed beneath surficial deposits. Soil maps (Soil Survey Staff, 2014) tuffaceous laucustrine deposits exposed in the Teton River canyon (Phillips were helpful in characterizing some surficial units. Field work for new during at least three glaciations: Sacagawea Ridge, Bull Lake, and Pinedale (Richmond, 1973; Scott, 1982). Large volumes of outwash from Bull Lake and others, 2011) and in geothermal test well logs (Phillips, 2010) near geologic mapping was conducted in 2013 at a scale of 1:24,000. Basalts Newdale. 326636 were correlated with major and trace element analyses by wavelength and Pinedale glaciers were directed down the Falls River – Conant Creek drainages rather than south onto the map. The map likely received Yellow- dispersive x-ray fluorescence, and by paleomagnetic analyses using drilled Thr Rhyolitic Rocks of Heise Volcanic Field, undivided (Pliocene-Miocene)— Qas stone ice cap outwash only during Sacagawea Ridge glaciation during cores, spinner magnetometer, and alternating field demagnetization. Rhyolitic ignimbrites, lava flows, and pyroclastic deposits (Morgan and Qgo Marine Isotope Stage 16, at approximately 660 ka (Pierce, 2003). Most Fluxgate magnetometer determinations of basalt polarity were also used. McIntosh, 2005); shown in the cross section; not exposed in the map. Heise Qgo/Qbbc Qgo/Qbbc outwash in the map was derived from the western flank of the Teton Range. Qas Qyh Qyh units are exposed in the adjacent Tetonia (Phillips and others, 2013a) and Packsaddle Lake (Phillips, and others, 2013b) quadrangles, and were Qyh 430888 Qas STRATIGRAPHY suggested by Christiansen (2001) and Morgan and McIntosh (2005) to be MASS WASTING DEPOSITS present in the subsurface of the Lamont map. Qyh Qls Landslides (Holocene-Late Pleistocene)—Along the south rim of Bitch Creek Qas Qas Exposed bedrock consists of the early Pleistocene Huckleberry Ridge Tuff of canyon, deposits consist of topples and falls of basalt blocks ranging in size Qgo/Qyh the Yellowstone Group (Christiansen, 2001), overlain in many places by Qgo/Qyh between 1 to >2 m (3 to >6.5 ft). Tension cracks are locally present parallel REFERENCES Qyh Pleistocene basalt lava flows. Vents for the basalts are obscured by thick to the rim. Elsewhere, consists of hummocky earth flows composed of Qgo/Qyh loess deposits; their location was inferred using geomorphic criteria. reworked loess along fault scarps. Many small topples and falls of rhyolite Christiansen, R.L., 2001, The Quaternary and Pliocene Yellowstone Plateau Regional relationships suggest that these units are underlain by Pliocene- Qas (not mapped) are also present on steep slopes of Bitch Creek and Badger volcanic field of Wyoming, Idaho, and Montana, U.S. Geological Survey Qas Miocene rhyolitic rocks, and associated basalts and tuffaceous sediments of Qgo/Qbbc Qyh Creek canyons. Professional Paper 729-G. 145 p. the Heise volcanic field (Morgan and McIntosh, 2005; Christiansen, 2001; Qas Qabi Dauteuil, O., J. Angelier, F. Bergerat, S. Verrier, and T. Villemin, 2001, Deforma- Qbbc Phillips and others, 2011; Phillips, 2010). This stratigraphy is characteristic EOLIAN SEDIMENTS tion partitioning inside a fissure swarm of the northern Icelandic rift: Journal Qabi of the uplands bordering the southeastern Snake River Plain from Ririe to Qas of Structural Geology, v. 23, p. 1359-1372. Qbbc Qyh this map. Qel Loess (Late-Middle Pleistocene)—Massive, light gray to light brownish gray silt, Qyh Ellis, B.S., D.F. Mark, C.J. Pritchard, and J.A. Wolff, 2012, Temporal dissection clay, and very fine sand; locally crudely bedded where reworked on hill 40 39 72713-13 of the Huckleberry Ridge Tuff using the Ar/ Ar dating technique: Quater- Qbbc Surficial units are dominated by late Pleistocene loess deposits. Economi- slopes. Thickness in water wells averages 8 m (25 ft), with range of 2 to 14 m Qas Qyh cally important potato and grain crops are grown on soils derived from the nary Geochronology, v. 9, p. 34-41. (7 to 46 ft). Cut along Ashton-Tetonia railroad grade in NW 1/4 sec. 6, T. 7 N, Feeney, D.M., D.L., Garwood, and W.M. Phillips, in press, Geology of the R loess. The areas north of Bitch Creek and along the eastern edge of the map Qyh R. 45 E. exposes about 4.5 m (15 ft) of loess. Landforms covered with thick Drummond quadrangle, Teton and Fremont counties, Idaho: Idaho Qbbc Qgo/Qyh received deposits of glacial outwash derived from the Teton Range. Most of loess display prominent linear geomorphic patterns that trend northeast, 73013-5 Qyh Qas Qgo/Qyh Geological Survey Digital Web Map. R the outwash appears to be older than the loess deposits. parallel to prevailing winds.
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