U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database

Geologic Unit: Chipman

Usage:

Chipman Formation (VT*)


Subunits:

(alphabetical) --all in VT*: Beldens Member, Bridport Member, Burchards Member, Weybridge Member.


Geologic age:

Middle Ordovician (Whiterockian; Arenig to Llanvirn)*


Type section, locality, area and/or origin of name:

Named from Chipman Hill in outcrop belt north of Middlebury Village, Addison Co., west-central VT (Kay and Cady, 1947).


AAPG geologic province:

New England province*


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).