Trout Valley Formation
| Trout Valley Formation Stratigraphic range: Devonian | |
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The Trout Valley Formation is a geologic formation in Maine. It preserves fossils dating back to the Devonian period.
Description
Situated in north-central Maine, the Trout Valley Formation is located in a fault-bounded basin. An erosional unconformity separates it from underlying felsites. The formation is made up of coarse conglomerate, containing fragments of the underlying felsite. The conglomerate is overlain by sandstone, which contains lenses of gray shale, black shale and conglomerate.
The Trout Valley Formation was dated to the Early Devonian by the presence of fossilized eurypterid scales, possible estherids and ostracods. The formation also contains fossilized Psilophyton plants. In contrast to the Traveler Rhyolite, felsites and other sandstones beneath the Trout Valley Formation, which have open folds, the formation itself is unfolded. This suggests that the Trout Valley Formation was deposited after the tectonic activity that altered the underlying rocks. Although the Katahdin Pluton cuts through the Traveler Rhyolite, granitic fragments from the Katahdin Pluton have never been found in the Trout Valley Formation.
See also
References
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 31 July 2014. Retrieved 22 June 2014.
- Various contributors. "Trout Valley Formation". The Appalachian-Ouachita Orogen in the United States. Robert D. Hatcher Jr., William A. Thomas and George W. Viele (eds.). p. 213. Retrieved 2017-09-18.