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  • Usage in publication:
    • Chase Lake Formation
  • Modifications:
    • Named
  • Dominant lithology:
    • Graywacke
    • Conglomerate
    • Slate
  • AAPG geologic province:
    • New England province
Publication:

Hall, B.A., 1970, Stratigraphy of the southern end of the Munsungun anticlinorium, Maine: Maine Geological Survey Bulletin, no. 20, 63 p.


Summary:

Named for Chase Lake, Piscataquis Co., north-central ME. Consists of a lower member composed of slate and graywacke and an upper member composed of conglomerate and graywacke. Thickness is at least 610 m. Unconformably overlies Chase Brook Formation; conformably underlies Bluffer Pond Formation. Age is Middle Ordovician.

Source: GNU records (USGS DDS-6; Reston 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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