Here is a picture of a
Placenticeras meeki ammonite fossil at
the Museo di Paleontologia at Sapienza University of Rome Italy.
Creatures like this existed in the western interior seaway at the time
of the upper/late Cretaceous Period (ICS geological timescale:
Maastrichtian; 70 million years ago). Fossil was found in Cheyenne River of South Dakota USA.
Image taken in June 2014.
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