- Usage in publication:
-
- Head member
- Modifications:
-
- Named
- Dominant lithology:
-
- Sandstone
- Siltstone
- Argillite
- AAPG geologic province:
-
- New England province
Summary:
Named the Head member of the Day Point formation in VT and northeastern NY for The Head, Isle La Motte, northwestern VT. Consists of dark-gray, greenish-tinged dense fine calcareous quartz sandstone to siltstone and interbedded silty argillite that disconformably overlies the Bridport dolomite south of Scott Point, Isle La Motte; proportion of shaly argillite varies and is locally dominant. Thickness is 16 feet. Underlies the Scott member of the Day Point. The Head is of Middle Ordovician (Chazyan) age.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Head Siltstone†
- Modifications:
-
- Not used
- AAPG geologic province:
-
- New England province
Summary:
The Head Siltstone is "abandoned" in New York and replaced by the Ste. Therese Siltstone.
[Technically, not abandoned because type locality is in Vermont. However, name is discarded from New York Geol. Survey nomenclature.]
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 ([ ]).