Wanakah Formation

Type Locality:
Not designated. Named for exposures in Wanakah mine, Ouray Co., CO (Burbank, 1930).

Subunits:
(alphabetical): Beclabito Member (AZ*,NM*), Bilk Creek Sandstone Member (CO*), Horse Mesa Member (AZ*,CO*,NM*,UT*), Junction Creek Sandstone Member (CO*), Pony Express Limestone Member (CO*), Todilto Limestone Member (AZ*,NM*).

Unit Name History:
Named basal member of Morrison Formation (Burbank, 1930). Revised; Reference (Goldman and Spencer, 1941). Revised (Eckel, 1949; Bachman, 1953). Not used (Griggs and Read, 1959). Revised (Hansen, 1968). Mapped 1:24k in southeast Ouray Co, CO (Luedke, 1972). Areal limits (O'Sullivan, 1980; 1981; 1983). Revised (Ridgley, 1986). Not used (Scott, 1986). Reference; Revised (Condon and Huffman, 1988). Figure (GNU Staff, 1989). Overview (Ridgley, 1989). Revised (Condon, 1989). Areal limits; Overview (O'Sullivan, 1991). Revised (O'Sullivan, 1992a). Reference; Overview (O'Sullivan, 1992b). Areal limits; Overview (Condon, 1992).

References

Burbank, W.S., 1930, Revision of geologic structure and stratigraphy in the Ouray district of Colorado, and its bearing on ore deposition: Colorado Scientific Society Proceedings, v. 12, no. 6, p. 151-232.

Goldman, M.I. and Spencer, A.C., 1941, Correlation of Cross' La Plata sandstone, southwestern Colorado: American Association of Petroleum Geologists Bulletin, v. 25, no. 9, p. 1745-1767.

Eckel, E.B., 1949, Geology and ore deposits of the La Plata district, Colorado: U.S. Geological Survey Professional Paper, 219, 179 p.

Bachman, G.O., 1953, Geology of a part of northwestern Mora County, New Mexico: U.S. Geological Survey Oil and Gas Investigations Map, OM-137, 1 sheet, scale 1:48,000.

Griggs, R.L. and Read, C.B., 1959, Revisions in stratigraphic nomenclature in Tucumcari-Sabinoso area, northeastern New Mexico: American Association of Petroleum Geologists Bulletin, v. 43, no. 8, p. 2003-2007.

Hansen, W.R., 1968, Geologic map of the Black Ridge quadrangle, Delta and Montrose Counties, Colorado: U.S. Geological Survey Geologic Quadrangle Map, GQ-747, 1 sheet, scale 1:24,000.

Luedke, R.G., 1972, Geologic map of the Wetterhorn Peak quadrangle, Colorado: U.S. Geological Survey Geologic Quadrangle Map, GQ-1011, 1 sheet, scale 1:24,000.

O'Sullivan, R.B., 1980, Stratigraphic sections of Middle Jurassic San Rafael Group from Wilson arch to Bluff in southeastern Utah: U.S. Geological Survey Oil and Gas Investigations Chart, OC-102, 1 sheet.

O'Sullivan, R.B., 1981, Stratigraphic sections of some Jurassic rocks from near Moab, Utah to Slick Rock, Colorado: U.S. Geological Survey Oil and Gas Investigations Chart, OC-107, 1 sheet.

O'Sullivan, R.B., 1983, Stratigraphic sections of Middle Jurassic San Rafael Group and related rocks from Dewey Bridge, Utah to Uravan, Colorado: U.S. Geological Survey Oil and Gas Investigations Chart, OC-124, 1 sheet.

Ridgley, J., 1986, Diagenesis of the Todilto Limestone Member of the Wanakah Formation, Chama basin, New Mexico, IN Mumpton, F.A., and others, editors, Studies in diagenesis: U.S. Geological Survey Bulletin, 1578, p. 197-206.

Scott, G.R., 1986, Geologic and structure contour map of the Springer 30' x 60' quadrangle, Colfax, Harding, Mora, and Union Counties, New Mexico: U.S. Geological Survey Miscellaneous Investigations Series Map, I-1705, 2 sheets, scale 1:100,000.

Condon, S.M. and Huffman, A.C., Jr., 1988, Revisions in nomenclature of Middle Jurassic Wanakah Formation, northwest New Mexico and northeast Arizona, IN Revisions to stratigraphic nomenclature of Jurassic and Cretaceous rocks of the Colorado Plateau: U.S. Geological Survey Bulletin, 1633-A, p. A1-A12.

Condon, S.M., 1989, Revisions of Middle Jurassic nomenclature in southeastern San Juan basin, New Mexico, IN Evolution of sedimentary basins, San Juan basin: U.S. Geological Survey Bulletin, 1808-E, p. E1-E21.

GNU Staff, 1989, GNU Staff remark by M.E. Mac Lachlan. Relationship of Zuni Sandstone (Jz), Cow Springs Sandstone (Jcs), Entrada Sandstone (Je), and Wanakah Formation (Jw) in San Juan basin (adapted from Condon and Huffman, 1988; Condon, 198?).: U.S. Geological Survey, unpublished geologic names committee note Ridgley, J.L., 1989, Trace fossils and mollusks from the upper member of the Wanakah Formation, Chama basin, New Mexico; evidence for a lacustrine origin, IN Evolution of sedimentary basins, San Juan basin: U.S. Geological Survey Bulletin, 1808-C, p. C1-C16.

O'Sullivan, R.B., 1991, Correlation of Middle Jurassic San Rafael Group and related rocks from Kane Springs, Utah to Uravan, Colorado: U.S. Geological Survey Oil and Gas Investigations Chart, OC-134, 1 sheet.

Condon, S.M., 1992, Geologic framework of pre-Cretaceous rocks in the Southern Ute Indian Reservation and adjacent areas, southwestern Colorado and northwestern New Mexico, IN Geology and mineral resources of the Southern Ute Indian Reservation: U.S. Geological Survey Professional Paper, 1505-A, p. A1-A56.

O'Sullivan, R.B., 1992, Jurassic Wanakah and Morrison Formations in the Telluride-Ouray-western Black Canyon area of southwestern Colorado: U.S. Geological Survey Bulletin, 1927, 24 p.

O'Sullivan, R.B., 1992, Correlation of Middle Jurassic and related rocks from Ouray to Black Canyon, western Colorado: U.S. Geological Survey Oil and Gas Investigations Chart, OC-139, 1 sheet.

O'Sullivan, Robert B., 2000, Correlation of Middle Jurassic San Rafael Group and related rocks from Bluff to Monticello in southeastern Utah: U.S. Geological Survey, Miscellaneous Field Studies Map MF-2351, 1 sheet. <http://greenwood.cr.usgs.gov/pub/mf-maps/mf-2351/>

Luedke, Robert G., and Burbank, Wilbur S., 1994, Measured stratigraphic sections in the Ouray area, western San Juan Mountains, Colorado: U.S. Geological Survey, Open-File Report OF 94-0583, 28 p.