The National Geologic Map Database is migrating to a new infrastructure. We apologize for any service disruptions during this process.

U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database
Map showing publication footprint
  • Usage in publication:
    • Ames Knob formation*
  • Modifications:
    • Named
  • Dominant lithology:
    • Limestone
    • Shale
    • Conglomerate
  • AAPG geologic province:
    • New England province
Publication:

Smith, G.O., Bastin, E.S., and Brown, C.W., 1907, Description of the Penobscot Bay quadrangle [Maine]: U.S. Geological Survey Geologic Atlas of the United States Folio, Penobscot Bay folio, no. 149, 14 p.


Summary:

Ames Knob formation named in Penobscot Bay area, Knox Co., ME. Consists of limestones and red shales, with several conglomerate beds and a basal conglomerate member, which is 16 ft thick. Contains Niagara fossils. Thickness 580 ft. Rests on North Haven greenstone. Overlain by volcanic rocks. Age is Silurian.

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 ([ ]).

Accessibility FOIA Privacy Policies and Notices

USA Gov U.S. Department of the Interior | U.S. Geological Survey
Supported by the National Cooperative Geologic Mapping Program
Page Contact Information: Personnel
Page Last Modified: Thu 21 May 2026 04:53:25 PM MDT