Usage:
[?] Head Member of Day Point Limestone (VT)
[?] Head Member of Day Point Limestone of Chazy Group (VT)
(†Head Member of Day Point Limestone not used by the NY Geol. Survey. Replaced with Ste. Therese Siltstone. See Ste. Therese. Uncertain if used by the VT Geol. Survey or the USGS.)
[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).]
Geologic age:
Middle Ordovician (Whiterockian; early Chazyan)
Type section, locality, area and/or origin of name:
The Head, a bluff at south end of Isle La Motte, northwestern VT (Oxley and Kay, 1959).
AAPG geologic province:
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 ([ ]).