Abstract
A new fossil fauna has been discovered from a recently recognized shale unit within the middle Ordovician St. Peter Formation in northeast Iowa. It contains a variety of invertebrates and vertebrates, including soft body tissues, impressions, and 3-dimensionalpreservations. The exceptional preservation reveals a new Konservat-Lagerstätte, the Winneshiek Lagerstätte, and opens a unique window into the community that inhabited the margins of the Laurentian cratonic seaway during Middle Ordovician transgression. Among the fossils, several conodont assemblages, including the apparatus of enigmatic coleodontids, are preserved. Some conodont assemblages associated with soft body tissues are particularly noteworthy.
GeoRef Subject
Arthropoda
Brachiopoda
Chordata
Merostomata
paleoecology
Saint Peter Sandstone
Paleozoic
Middle Ordovician
microfossils
Ordovician
Pisces
shale
clastic rocks
Conodonta
United States
Vertebrata
Vermes
Chelicerata
Crustacea
Eurypterida
Iowa
Mandibulata
sedimentary rocks
Invertebrata
Winneshiek County Iowa
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