Lewis Shale

Usage of Geologic Unit Name:
Lewis Shale (CO*,NM*,UT*,WY*)
Cretaceous, Late*
Campanian, late*
Maastrichtian, early*
Geologic Province:
Big Horn basin*
Green River basin*
Powder River basin*
San Juan basin*
Wind River basin*
Areal Extent:
Type Locality:
Not designated. Named for occurrence at Fort Lewis in La Plata Valley, Kline quad, La Plata Co., CO (Cross and Spencer, 1899).
Principal reference section designated at SW/4 SW/4 sec. 13 and SE/4 SE/4 sec. 14, T. 22 N., R. 89 W., Carbon Co., WY (Gill and others, 1970).
(alphabetical): Dad Sandstone Member (WY*), Huerfanito Bentonite Bed (CO*,NM*), Teckla Sand Member (WY) or Teckla Sandstone Member (WY*).
Unit Name History:
Named (Cross and Spencer, 1899). Areal limits (Beaumont and others, 1956). Revised (Hale, 1961; Hyden and others, 1965). Principal reference; Overview (Gill and others, 1970). Overview (Izett and others, 1971). Revised (Fassett and Hinds, 1971). Areal limits (Keefer, 1972). Teckla Sand Member named (Runge and others, 1973). Areal limits (Merewether and others, 1977). Mapped 1:50k in San Juan and McKinley Cos, NM; Areal limits (Scott and others, 1984). Biostratigraphic dating (Cobban, 1988; Roehler, 1993). Areal limits (Fox, 1993).


Cross, C.W. and Spencer, A.C., 1899, Description of the La Plata quadrangle [Colorado]: U.S. Geological Survey Geologic Atlas of the United States, La Plata folio, no. 60, 14 p.

Beaumont, E.C., Dane, C.H. and Sears, J.D., 1956, Revised nomenclature of Mesaverde Group in San Juan basin, New Mexico: American Association of Petroleum Geologists Bulletin, v.
40, no. 9, p. 2149-2162.

Hale, L.A., 1961, Late Cretaceous (Montanan) stratigraphy eastern Washakie basin, Carbon County, Wyoming, IN Symposium on Late Cretaceous rocks, Wyoming and adjacent areas: Wyoming Geological Association Field Conference Guidebook, no. 16, p. 129-137.

Hyden, H.J., McAndrews, H. and Tschudy, R.H., 1965, The Foote Creek and Dutton Creek Formations, two new formations in the north part of the Laramie basin, Wyoming, IN Contributions to stratigraphy: U.S. Geological Survey Bulletin, 1194-K, p. K1-K12.

Gill, J.R., Merewether, E.A. and Cobban, W.A., 1970, Stratigraphy and nomenclature of some Upper Cretaceous and lower Tertiary rocks in south-central Wyoming: U.S. Geological Survey
Professional Paper, 667, 53 p.

Fassett, J.E. and Hinds, J.S., 1971, Geology and fuel resources of the Fruitland Formation and Kirtland Shale of the San Juan basin, New Mexico and Colorado: U.S. Geological Survey
Professional Paper, 676, 76 p., (incl. geologic map, scale 1:380,160), Reprinted 1977.

Izett, G.A., Cobban, W.A. and Gill, J.R., 1971, The Pierre Shale near Kremmling, Colorado, and its correlation to the east and the west, IN Shorter contributions to general geology, 1970: U.S. Geological Survey Professional Paper, 684-A, p. A1-A19.

Keefer, W.R., 1972, Frontier, Cody, and Mesaverde Formations in the Wind River and southern Bighorn basins, Wyoming, IN Geology of the Wind River basin, central Wyoming: U.S.
Geological Survey Professional Paper, 495-E, p. E1-E23.

Runge, J.S., Wicker, W.L. and Eckelberg, D.J., 1973, A subsurface type section of the Teckla Sand Member of the Lewis Shale Formation: Wyoming Geological Association Earth Science
Bulletin, v. 6, no. 3, p. 3-18.

Merewether, E.A., Cobban, W.A., Matson, R.M. and Magathan, W.J., 1977, Stratigraphic diagrams with electric logs of Upper Cretaceous rocks, Powder River basin, Natrona, Campbell, and Weston Counties, Wyoming, section B-B': U.S. Geological Survey Oil and Gas Investigations Chart, OC-74, 1 sheet.

Scott, G.R., O'Sullivan, R.B. and Weide, D.L., 1984, Geologic map of the Chaco Culture National Historical Park, northwestern New Mexico [includes chapter on archaeology by W.B. Gillespie]: U.S. Geological Survey Miscellaneous Investigations Series Map, I-1571, 1 sheet, scale 1:50,000.

Cobban, W.A., 1988, The Upper Cretaceous ammonite Rhaeboceras Meek in the Western Interior of the United States: U.S. Geological Survey Professional Paper, 1477, 15 p.

Roehler, H.W., 1993, Stratigraphy of the Upper Cretaceous Fox Hills Sandstone and adjacent parts of the Lewis Shale and Lance Formation, east flank of the Rock Springs uplift,
southwest Wyoming: U.S. Geological Survey Professional Paper, 1532, 57 p., (incl. geologic map, scale 1:100,000).

Fox, J.E., 1993, Stratigraphic cross sections showing electric logs of Upper Cretaceous and older rocks, Powder River basin, southeastern Montana and northeastern Wyoming: U.S. Geological Survey Oil and Gas Investigations Chart, OC-135 to OC-138, 4 sheets, sections A-A' trhough F-F'; G-G' through L-L'; M-M' through R-R'; S-S' through V-V.'

Bereskin, S Robert, 2002, Geologic and production characteristics of the Lewis Shale (San
Juan Basin, New Mexico) as results apply to other Cretaceous "shales" of the Western Interior; the next unconventional reservoir of the Rocky Mountains, USA and Canada: Reservoir, v. 29, no. 5, p. 10.

Almon, William R., Dawson, William C., Sutton, Sally J., Ethridge, Frank G., and Castelblanco, Bellatrix, 2002, Sequence stratigraphy, facies variation and petrophysical properties in deepwater shales, Upper Cretaceous Lewis Shale, south-central Wyoming: Gulf Coast Association of Geological Societies, Transactions, v. 52, p. 1041-1053.

Almon, William R., Dawson, William C., Sutton, Sally J., Ethridge, Frank G., and Castelblanco, Bellatrix, 2001, Sequence stratigraphy, petrophysical variation, and sealing capacity in deepwater shales, Upper Cretaceous Lewis Shale, south-central Wyoming: Wyoming Geological Association Guidebook, v. 52, p. 163-182.

Sealey, P. L., and Lucas, Spencer G., 1997, Paleontology, stratigraphy and biostratigraphy of the Upper Cretaceous Lewis Shale near Waterflow, San Juan County, New Mexico: New Mexico Geological Society, Guidebook, v. 48, p. 233-237.

Howard, Alan D; Kochel, R Craig, 1988, Introduction to cuesta landforms and sapping processes on the Colorado Plateau. In, Sapping features of the Colorado Plateau; a comparative planetary geology field guide: Howard, Alan D., Kochel, R. Craig, and Holt, Henry E., NASA Special Publication, vol.491, pp.6-56.

Return to Main Page
* show accepted USGS usage.
Note that data on this page contains information that has been partly revised from bibliographic resources available via the National Geologic Map Database GEOLEX:
The URL is: https://gotbooks.miracosta.edu/gonp/coloradoplateau/lexicon/lewis.htm
Last modified: 1/7/2011