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Only Brontosaurus is also in the subfamily
this animal is dubious and can only be described in generalities based on similar animals
The family Gerridae is thought to have originated in the Cretaceous
Seen here is a good example of the rare Morrison Formation tooth of Torvosarus
Timber Lake
UK Ammonite Hoploscaphites IF-UKA-16-010 Lower Cretaceous Only Brontosaurus is also inHoploscaphites nodosus Pierre Formation Upper Cretaceous (Campanian) Pennington County, South Dakota This is an excellent example of the microconch form of H. nodosus. The specimen has the original shell, and it is iridescent on the living chamber. This specimen has very well defined nodes typical of the species. It is complete all the way to the aperture. The specimen is repaired. The ammonite is just over 4 inches. H. nodosus is comparatively large