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dentisulcatus was larger
was about 15 meters (49 ft) in length
This specimen has excellent preservation and detail for this locality
They lived about 152 to 151 million years ago (mya)
Dicranomyia sp
UK Ammonite Placenticeras IF-UKA-16-016 Upper Cretaceous dentisulcatus was largerPlacenticeras meeki Pierre Formation Upper Cretaceous (Campanian) Meade County, South Dakota This example of P. meeki has the original shell with some good red and green iridescence. The shell is thin in some areas and the underlying sutures are visible. The specimen is prepared on its original matrix and is a very good display. The ammonite is 8. 5 inches across. There is a sliver of restoration along the venter (see illustrated photo). The innermost
