The Winneshiek biota: exceptionally well-preserved fossils in a Middle Ordovician impact crater

  title={The Winneshiek biota: exceptionally well-preserved fossils in a Middle Ordovician impact crater},
  author={Derek E. G. Briggs and Huaibao P. Liu and Robert Murray McKay and Brian J. Witzke},
  journal={Journal of the Geological Society},
  pages={865 - 874}
The Winneshiek Shale (Middle Ordovician, Darriwilian) was deposited in a meteorite crater, the Decorah impact structure, in NE Iowa. This crater is 5.6 km in diameter and penetrates Cambrian and Ordovician cratonic strata. It was probably situated close to land in an embayment connected to the epicontinental sea; typical shelly marine taxa are absent. The Konservat-Lagerstätte within the Winneshiek Shale is important because it represents an interval when exceptional preservation is rare. The… 

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