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the zones are Planorbis
falcoid ribs that spring in pairs from umbilical tubercles
4 in) in length
forming the creek bluff north of the railway
the contact surface with the quadratojugal
UK Ammonite Hoploscaphites IF-UKA-16-020 Damselfly the zones are PlanorbisHoploscaphites plenus Bear Paw Formation Upper Cretaceous (Maastrichtian) Dawson County, Montana The largest scaphite in this specimen is a macroconch form of H. plenus prepared in the original limestone concretion matrix. Most of the original shell is preserved and some sutures are also visible through areas where the shell is thin. This specimen is a premier example of the species and is a stunning display. There is no repair or restoration. Also