- Usage in publication:
-
- Crown Point limestone
- Modifications:
-
- Original reference
- Dominant lithology:
-
- Limestone
- AAPG geologic province:
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- Appalachian basin
- New England province
Summary:
Crown Point limestone. Adopted the subdivisions of the Chazy proposed by E. Brainerd and H.M. Seely in 1888 (Amer. Geol., v. 2, p. 323-330), as explained under Chazy group, and proposed Crown Point limestone for group B or middle Chazy, probably from exposures at or near Crown Point, Essex County, Champlain Valley, eastern New York. Age is Early Ordovician.
Source: US geologic names lexicon (USGS Bull. 896, p. 549).
- Usage in publication:
-
- Crown Point limestone
- Modifications:
-
- Areal extent
- Age modified
- AAPG geologic province:
-
- New England province
Summary:
Geographically extended the Crown Point limestone to west-central VT. Unit is part of Chazyan succession (Chazy group) and is lowest formation in the group. Overlies the Bridport dolomite of the upper part of the Beekmantown and underlies the Beldens limestone. Thickness is 0 to 150 feet. The Crown Point is of Middle Ordovician age.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Crown Point member
- Modifications:
-
- Revised
- AAPG geologic province:
-
- New England province
Summary:
Revised the Crown Point to the Crown Point member of the Chazy limestone in VT. Consists of massive limestone with characteristic MACLURITES MAGNUS fossils. Overlies the Day Point member and underlies the Valcour member, both of the Chazy limestone. The Crown Point is of Middle Ordovician age.
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 ([ ]).