- Usage in publication:
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- Castine formation*
- Modifications:
-
- Named
- Dominant lithology:
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- Lava
- Dacite
- Rhyolite
- Andesite
- AAPG geologic province:
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- New England province
Summary:
Named for Castine Peninsula, Hancock Co., south-central ME. Consists of light-colored, altered lavas and pyroclastics, including rhyolites, dacites, and andesites. Relations indicate that Castine formation, Islesboro formation, and North Haven greenstone are nearly contemporaneous. Age is Cambrian(?).
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
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- Castine Volcanics*
- Modifications:
-
- Age modified
- Geochronologic dating
- AAPG geologic province:
-
- New England province
Summary:
Age changed from Cambrian(?) to Early Devonian based on Rb-Sr age of 390+/-5 m.y. Correlates with Thorofare Andesite-Vinalhaven Rhyolite sequence.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Castine Volcanics*
- Modifications:
-
- Age modified
- Geochronologic dating
- AAPG geologic province:
-
- New England province
Summary:
A recent isotopic age of about 500 Ma [Early Ordovician] was determined for Castine Volcanics by McLeod and others (1991, Compilation and correlation of southwestern New Brunswick geology; Charlotte, Queen, Kings, Saint John, and Sunbury Counties (PROV and C-NBCAMD), IN Abbott, S.A., ed., Project summaries for 1991, sixteenth annual review of activities: New Brunswick Department of Natural Resources and Energy, Mineral Resource, Information Circular 91-2, p. 128-133.)
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Castine Volcanics*
- Modifications:
-
- Age modified
- Geochronologic dating
- AAPG geologic province:
-
- New England province
Summary:
Age of Castine Volcanics changed to Ordovician(?) or Silurian(?). Zircon from rhyolite east of Harborside yielded U-Pb date of 503+/-4 Ma (Early Ordovician) (Ruitenberg and others, 1993). Rb-Sr whole-rock age is 382+/-5 Ma reported by Brookins and others (1973) is wrong because Silurian South Penobscot Intrusive Suite and granite of Sedgwick imposed contact metamorphism on Castine Volcanics. Castine contains clasts of Ellsworth Schist in its basal conglomerate.
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 ([ ]).