- Usage in publication:
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- Devils Bridge Clay
- Modifications:
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- Named
- Dominant lithology:
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- Clay
- AAPG geologic province:
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- Atlantic Coast basin
Summary:
The Devils Bridge Clay is here named in Martha's Vineyard, MA. It is part of the Gay Head moraine, composed of thrust plates made up of remnants of Coastal Plain sediments which have been piled up by Pleistocene glaciation. It consists of black, massive, organic-poor, ferruginous clay which oxidizes rapidly to brown goethite. Overlies the Gay Head Greensand with erosional contact; underlies the Lobsterville Sand or Pleistocene deposits. Thickness is 2.6 m. Age is late Miocene(?) and early Pliocene(?) based on a restricted pollen assemblage.
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 ([ ]).