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Eutrephoceras dekayi

Geological Range

Campanian to Maastrichtian

Paleogeographic Distribution

Tennessee to Texas to Montana

Stratigraphic Occurrences

Maastrichtian
Fox Hills Formation (SD)
Fox Hills Formation (Trail City Member) (SD)
Pierre Shale (WY)
Ripley Formation (MS)
Ripley Formation (Coon Creek Member) (TN)
Campanian
Bearpaw Shale (Upper) (MT) [Campanian]
Pierre Shale (MT)
Pierre Shale (SD) [Campanian]
Taylor Marl (TX)
Unknown Stage
Bear Paw Shale (MT)
Pierre Shale (SD)
Ripley Formation (AL)
<i> Eutrephoceras dekayi </i> from the Late Cretaceous Pierre Shale Fm. of Pennington County, South Dakota (YPM 219057).
Eutrephoceras dekayi from the Late Cretaceous Pierre Shale Fm. of Pennington County, South Dakota (YPM 219057).
<i> Eutrephoceras dekayi </i> from the Late Cretaceous Pierre Shale Fm. of Meade County, South Dakota (FHSMIP 1290).
Eutrephoceras dekayi from the Late Cretaceous Pierre Shale Fm. of Meade County, South Dakota (FHSMIP 1290).
<i> Eutrephoceras dekayi </i> from the Late Cretaceous Pierre Shale Fm. of South Dakota (UNM 4469).
Eutrephoceras dekayi from the Late Cretaceous Pierre Shale Fm. of South Dakota (UNM 4469).
Stratigraphic position unknown
Stratigraphic position unknown