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Map showing publication footprint
  • Usage in publication:
    • La Ventana sandstone member*
  • Modifications:
    • Named
  • Dominant lithology:
    • Sandstone
    • Shale
  • AAPG geologic province:
    • San Juan basin
Publication:

Dane, C.H., 1936, The La Ventana-Chacra Mesa coal field, Part 3, IN Sears, J.D., Hunt, C.B., and Dane, C.H., Geology and fuel resources of the southern part of the San Juan basin, New Mexico: U.S. Geological Survey Bulletin, 860-C, p. 81-161.


Summary:

A marine sandstone at top of Upper Cretaceous Mesaverde formation immediately east and west of the Rio Puerco named La Ventana sandstone member for town of La Ventana, Sandoval Co, NM in the San Juan basin. No type locality designated. Lower part of member is a marine buff sandstone and gray shale; upper part of member is partly marine and partly continental white, gray, and buff sandstone with interbedded carbonaceous shale and discontinuous coal beds. Is 1,256 ft thick in T19N, R1W; thins rapidly northward by intertonguing into overlying Lewis shale. Overlies and intertongues with Allison member of Mesaverde. Geologic map. Cross section.

Source: GNU records (USGS DDS-6; Denver GNULEX).


Map showing publication footprint
  • Usage in publication:
    • La Ventana tongue*
  • Modifications:
    • Revised
  • AAPG geologic province:
    • San Juan basin
Publication:

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. [Available online, with subscription, from AAPG archives: http://www.aapg.org/datasystems or http://search.datapages.com]


Summary:

Reassigned from Mesaverde formation to Cliff House sandstone of Mesaverde group in San Juan basin. Term Mesaverde group extended throughout San Juan basin of southwest CO and northwest NM. Is a sandstone unit on east side of San Juan basin that does not connect with Mesaverde group on west side, but it is thought that "somewhere in the subsurface it will be found to connect essentially with the main body of Cliff House sandstone". La Ventana and Cliff House are genetically related transgressive marine sandstones. Small sketch map. Diagrammatic cross section. Of Late Cretaceous age.

Source: GNU records (USGS DDS-6; Denver GNULEX).


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).

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