- Usage in publication:
-
- Ellen Wood Ridge Formation
- Modifications:
-
- First used
- Dominant lithology:
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- Graywacke
- Slate
- Conglomerate
- AAPG geologic province:
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- New England province
Summary:
Ellen Wood Ridge Formation (new), assigned to the Prentiss Group (new) in east-central ME, consists of chalky weathering, greenish gray feldspathic wackes interbedded with greenish gray slates. Locally includes coarse conglomerate beds. Underlies the Daggett Ridge Formation (revised) and overlies the (descending) Sam Rowe Ridge and Mill Priviledge Brook Formations (new names), all of the Prentiss. Silurian age suggested by stratigraphic position.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Ellen Wood Ridge Formation
- Modifications:
-
- Overview
- AAPG geologic province:
-
- New England province
Summary:
Post-Caradocian Miramichi rocks may be divided into four formations. All four (Daggett Ridge, Mill Priveledge Brook, Sam Rowe Ridge, and Ellen Wood Ridge Formations) appear to interfinger. The Ellen Wood Ridge comprises green and greenish-gray feldspathic wacke and pelite and felsic volcanic and volcaniclastic rocks, with minor amounts of chloritic ashfall tuffs and coarse mafic tuffs. Abundance of volcanic rock is most distinctive characteristic of this formation, though most of the unit is composed of regularly bedded wacke and pelite. Contact with underlying Sam Row Ridge is transitional. Interfingers to west with upper part of Silurian Smyrna Mills Formation.
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 ([ ]).