Usage:
Chazy Group (NY*,VT*)
[Use of Chazy as a lithostratigraphic term (Chazy Group) should be discontinued. It is more widely used as a North American provincial chronostratigraphic term (Chazyan Stage).]
Subunits:
GROUP STATUS (alphabetical): Crown Point Limestone (NY*,VT*), Day Point Formation (NY*,VT*) or Day Point Limestone (NY*,VT*), Valcour Formation (NY*,VT*) or Valcour Limestone (NY*,VT*).
Geologic age:
Middle to Late Ordovician (Whiterockian; Chazyan)*
Type section, locality, area and/or origin of name:
Named from exposures at Chazy, Clinton Co., eastern NY (Emmons, 1842).
AAPG geologic province:
Adirondack uplift*
Appalachian basin*
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 ([ ]).