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National Geologic Map Database

Geologic Unit: Hartland

Usage:

Hartland Formation of Hutchinson River Group (CT*,NY*)
Hartland Group (CT)


Subunits:

GROUP STATUS (alphabetical) --all in CT: Ansonia Gneiss, Bee Brook Formation, Cooks Pond Schist, /Litchfield Schist, Mount Rat Schist, Mount Tom Amphibolite, Prospect Formation, Rattlesnake Hill Formation, Satans Kingdom Formation, The Straits Schist, Trap Falls Formation.
FORMATION STATUS: Carringtons Pond Member (CT,NY), Hitchcock Lake Member (CT), Pelham Bay Member (NY*), Southington Mountain Member (CT), The Straits Schist Member (CT).


Geologic age:

Cambrian to Ordovician*


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

Town of Hartland in northwest Hartford Co., CT (Rice and Gregory, 1906).


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 ([ ]).