Stephanie Bontorin. Konstantinos Papadimitrios. Pennsylvanian Period. It’s old. It’s gone. WHO CARES? (The Pennsylvanian Dutch do) It’s only half of the carboniferous. Description of time period. Pennsylvanian time period
The Moscovian stage was introduced by Sergei Nikitin in 1890
He defined this stage by the types of brachiopods found in the Moscow basin
The end of the Moscovian is marked by the appearance of the first ammonite genus (parashumardites)
The beginning of the Moscovian is difficult to pinpoint but as a generality the appearance of the condonts is considered the start.
Its named after the Russian city Of Gzhel the beginning of the Gzhelian is marked by the first apperance of the conodont (Streptognathodus zethus)
The beginning of the Permian or the end of the stage is marked by the first apperance of streptognathodus isolatus
A Carboniferous brachiopod Neospirifer condor, from Bolivia. The specimen is 7 cm across.