Winneshiek Shale
The Winneshiek Shale (originally the Winneshiek Lagerstätte) is a Middle Ordovician (Darriwilian-age) geological formation in Iowa. The formation is restricted to the Decorah crater, an impact crater near Decorah, Iowa. Despite only being discovered in 2005, the Winneshiek Shale is already renowned for the exceptional preservation of its fossils. The shale preserves a unique ecosystem, the Winneshiek biota, which is among the most remarkable Ordovician lagerstätten in the United States. Fossils include the oldest known eurypterid, Pentecopterus, as well as giant conodonts such as and Archeognathus.
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Winneshiek Shale
The Winneshiek Shale (originally the Winneshiek Lagerstätte) is a Middle Ordovician (Darriwilian-age) geological formation in Iowa. The formation is restricted to the Decorah crater, an impact crater near Decorah, Iowa. Despite only being discovered in 2005, the Winneshiek Shale is already renowned for the exceptional preservation of its fossils. The shale preserves a unique ecosystem, the Winneshiek biota, which is among the most remarkable Ordovician lagerstätten in the United States. Fossils include the oldest known eurypterid, Pentecopterus, as well as giant conodonts such as and Archeognathus.
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The Winneshiek Shale (original ...... nts such as and Archeognathus.
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66,148,621
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997,399,162
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Winneshiek Shale strata exposed via a temporary dam
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Location of the Decorah crater in Iowa, the only area where the Winneshiek Shale is found
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name
Winneshiek Shale
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namedby
Liu et al., 2006
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unnamed breccia unit
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period
Middle Ordovician
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Thickness
38 m
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The Winneshiek Shale (original ...... nts such as and Archeognathus.
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Winneshiek Shale
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