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the zones are Planorbis
the contact surface with the quadratojugal
This specimen is a pes claw the ornithischian dinosaur Othnielia
useful to state the relevant zones to give some context for the next few paragraphs
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
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