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Map showing publication footprint
  • Usage in publication:
    • Shin Brook Formation*
  • Modifications:
    • Named
  • Dominant lithology:
    • Sandstone
    • Siltstone
    • Conglomerate
    • Tuff
    • Breccia
  • AAPG geologic province:
    • New England province
Publication:

Neuman, R.B., 1964, Fossils in Ordovician tuffs, northeastern Maine, with a section on Trilobita by H.B. Whittington, IN Contributions to general geology, 1963: U.S. Geological Survey Bulletin, 1181-E, p. E1-E38.


Summary:

Named for Shin Brook, Penobscot Co., northeastern ME. Crops out along Shin Brook. Consists of bedded waterlaid volcanic sandstone and conglomerate, massive porphyritic rocks that are probably crystal tuffs, and volcanic breccia. Bedded rocks range from fine-grained siltstone to coarse-grained conglomerate. Full thickness not known. 904 ft thick at type section, of which 304 ft is exposed; type section is probably only a fraction of entire section. Northwest of segment of Grand Pitch Formation brought up by faulting, Shin Brook crops out for 1500 ft along the brook and on adjacent bluffs. Overlies Cambrian(?) Grand Pitch Formation; underlies metadiabase. Contains fossils. Age is Early or Middle Ordovician.

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


Map showing publication footprint
  • Usage in publication:
    • Shin Brook Formation*
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • New England province
Publication:

Rankin, D.W., 1994, Continental margin of the eastern United States; past and present, IN Speed, R.C., ed., Phanerozoic evolution of North American continent-ocean transitions: Geological Society of America, The Decade of North American Geology (DNAG), Continent-Ocean Transect Series, p. 129-218.


Summary:

Used as late Early Ordovician Shin Brook Formation. Age follows usage of Neuman (1967).

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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