Usage:
Merrimack Group (MA*,ME*,NH*)
Subunits:
Kittery, Eliot, and Berwick Formations
Geologic age:
Ordovician(?)*
Silurian(?)*
Type section, locality, area and/or origin of name:
Exposures on both sides of Merrimack River and near town of Merrimack, northeastern MA (Hitchcock, 1870).
AAPG geologic province:
New England province*
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 ([ ]).