Usage:
Mackworth Formation (ME)
Mackworth Formation of Casco Bay Group (ME)
Geologic age:
Middle to Late Ordovician
Type section, locality, area and/or origin of name:
Mackworth Island, Casco Bay, southwestern ME (Katz, 1917a; 1917b).
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 ([ ]).