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Geologic Unit: Alnwick
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Map showing publication footprint
  • Usage in publication:
    • Alnwick lake beds*
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Sandstone
    • Conglomerate
  • AAPG geologic province:
    • Denver basin
Publication:

Cross, Whitman, 1894, Pikes Peak folio, Colorado, with a desccription of Cripple Creek special map by R.A.F. Penrose, Jr.: U.S. Geological Survey Geologic Atlas of the United States Folio, GF-7, 7 p., scale 1:125,000


Summary:

Alnwick lake beds. Fine-grained sandstone and conglomerate, the latter containing pebbles representative of the volcanic series to west. Occurs in valley of Oil Creek about Alnwick, Pikes Peak region, [Teller County], eastern Colorado. No fossils, but lake is younger than that at High Park, the deposits of which are named High Park lake beds. Assigned to Neocene. [USGS adopted (ca. 1938) Tertiary (late Miocene or Pliocene) age for this unit.]

Source: US geologic names lexicon (USGS Bull. 896, p. 36).


Map showing publication footprint
  • Usage in publication:
    • Alnwick Lake Beds†
  • Modifications:
    • Abandoned
Publication:

Epis, R.C., and Chapin, C.E., 1974, Stratigraphic nomenclature of the Thirtynine Mile volcanic field, central Colorado, IN Contributions to stratigraphy: U.S. Geological Survey Bulletin, 1395-C, p. C1-C23.


Summary:

Abandoned. Rocks formerly assigned to Alnwick and High Park Lake Beds in the southeast corner of the Florissant quad and northeast quarter of Cover Mountain quad, Teller and Fremont Cos, CO, Denver basin, are now included in the Tallahassee Creek Conglomerate (new).

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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