- Usage in publication:
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- Tatnic Hill Formation*
- Modifications:
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- Geochronologic dating
- AAPG geologic province:
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- New England province
Summary:
Pg. 16, geologic time scale (inside front cover). Tatnic Hill Formation of Putnam Group. Sample from a garnet-plagioclase quartz gneiss in lower member of Tatnic Hill, in Canterbury Plainfield quadrangle, Windham County, Connecticut, yielded Pb-alpha age of 380 +/-40 Ma (zircon); reconnaissance age, calculated using decay constants of Steiger and Jager, 1977 (Earth Planet. Sci. Letters, v. 36, p. 359-362). Samples from Fly Pond Member and Bates Pond Lentil of Tatnic Hill, in Norwich quadrangle, New London County, Connecticut, yielded Pb-alpha ages from 535 +/-60 Ma to 280 +/-30 Ma; reconnaissance ages. Ages published by Snyder (1964); recalculated using decay constants of Steiger and Jager (1977). [See also entries under Fly Pond and Bates Pond.]
Source: Publication.
- Usage in publication:
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- Tatnic Hill Formation*
- Modifications:
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- Areal extent
- AAPG geologic province:
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- New England province
Summary:
Tatnic Hill and its Fly Pond and Yantic Members are extended from CT into the Webster area of MA according to Barosh (1977) and H.R. Dixon (unpub. data, 1978). Tatnic Hill Formation and underlying Quinebaug Formation form Putnam Group in the structural Putnam block. Units in the Putnam block are considered to be equivalent to units in the Nashoba block.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
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- Tatnic Hill Formation*
- Modifications:
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- Overview
- AAPG geologic province:
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- New England province
Summary:
Used as Tatnic Hill Formation of Proterozoic Z or Ordovician age. Includes Fly Pond and Yantic Members.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
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- Tatnic Hill Formation*
- Modifications:
-
- Overview
- AAPG geologic province:
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- New England province
Summary:
Used as Tatnic Hill Formation of Middle and Late(?) Ordovician age. Includes Fly Pond and Yantic Members.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
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- Tatnic Hill Formation*
- Modifications:
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- Age modified
- AAPG geologic province:
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- New England province
Summary:
The age of the Putnam Group, including its Tatnic Hill Formation, is considered to be Late Proterozoic(?) based on the 730 my age of the Fishbrook Gneiss in MA and the 440 my age of the Hedgehog Hill gneiss intruded into the upper part of the younger Brimfield Group.
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 ([ ]).