- Usage in publication:
-
- Smyrna Mills Formation*
- Modifications:
-
- Named
- Dominant lithology:
-
- Slate
- Siltstone
- Quartzite
- Graywacke
- AAPG geologic province:
-
- New England province
Summary:
Named Smyrna Mills Formation for town of Smyrna Mills in the Smyran Mills quadrangle, ME. Consists of varying clastic rock types including slate, siltstone, quartzite, quartz graywacke and some calcareous types. Its lower contact with underlying ribbon rock member of Meduxnekeag Formation is gradational. The age of the Smyrna Mills, based on graptolite correlations to the British Silurian stratotype, is early Llandoverian to early Ludlovian.
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 ([ ]).