Redmond Formation
The Redmond Formation is a geologic formation in Newfoundland and Labrador. It preserves fossils dating back to the mid-Cretaceous (Cenomanian). It was a thin (up to 1.5 metres (4.9 ft) thick) and restricted unit traced for 152 metres (499 ft) in a single mine (Redmond No. 1) in Labrador, overlying Paleoproterozoic rocks, with large amounts of rubble, probably as a result of graben subsidence within the Labrador trough. Argillite facies within the formation have produced a diverse flora and insect assemblage.[1]
Redmond Formation | |
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Stratigraphic range: Early Cenomanian | |
Type | Formation |
Underlies | Glacial deposits |
Overlies | Sokoman Formation |
Thickness | Up to 1.5 m (4.9 ft) |
Lithology | |
Primary | Argillite |
Location | |
Coordinates | 54.7°N 66.8°W |
Approximate paleocoordinates | 46.4°N 27.3°W |
Region | Newfoundland and Labrador |
Country | Canada |
Extent | Redmond Basin |
Type section | |
Named for | Redmond No. 1 mine |
Redmond Formation (Canada) |
Fossil content
Mesoraphidiidae
- Alloraphidia dorfi
Palaeoleontidae
- Palaeoleon ferrogeneticus
Susumaniidae
- Palaeopteron complexum
Coleoptera
- Coleoptera indet.
Labradorocoleidae
- Labradorocoleus carpenteri
Cupedidae
- Cupedidae indet.
- Haliplidae indet.
- Peltodytes sp.
Tettigarctidae
- Maculaferrum blaisi[2]
Dictyoptera
- Cretatermes carpenteri
- Labradormantis guilbaulti
References
- Demers Potvin & Larsson, 2019
- Demers Potvin et al., 2020
Bibliography
- Demers Potvin, Alexandre; Jacek Szwedo; Cassia Paragnani, and Hans Larsson. 2020. First North American occurrence of hairy cicadas discovered in a Late Cretaceous Cenomanian exposure from Labrador, Canada. Acta Palaeontologica Polonica 65. 85–98. Accessed 2020-07-31.
- Demers Potvin, Alexandre V., and Hans C.E. Larsson. 2019. Palaeoclimatic reconstruction for a Cenomanian‐aged angiosperm flora near Schefferville, Labrador. Palaeontology 62(6). 1027–1048. . doi:10.1111/pala.12444 ISSN 0031-0239
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