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Pseudoptera subtortuosa

Geological Range

Campanian to Maastrichtian

Paleogeographic Distribution

Wyoming to Montana

Stratigraphic Occurrences

Maastrichtian
Fox Hills Formation (WY)
Fox Hills Formation (Timber Lake Member) (SD)
Fox Hills Formation (Trail City Member) (SD)
Campanian
Pierre Shale (MT)
Unknown Stage
Marias River Shale (Kevin Member) (MT)
Pierre Shale (SD)
<i>Pseudoptera subtortuosa</i> from the Fox Hills Formation (Trail City Member) of Ziebach County, South Dakota (YPM 24046).
Pseudoptera subtortuosa from the Fox Hills Formation (Trail City Member) of Ziebach County, South Dakota (YPM 24046).
Stratigraphic position unknown
Stratigraphic position unknown