Cephalopods of the Midwest

Endoceras

Name Age Stage Formation Member Information Photos
Endoceras sp. Ordovician Cincinnatian Maquoketa Fort Atkinson Iowa(26) Side view
Closer view
Closest view
Endoceras? sp. Ordovician Cincinnatian Maquoketa Elgin Iowa(3) Side view
Opposite side
Closer view
Closer side view
Endoceras sp. Ordovician Cincinnatian Maquoketa Elgin Iowa(14) Side view
Closer view
Endoceras sp. Ordovician Champlanian Decorah Ion Iowa(16) Side view
Closer view
End view
Endoceras sp. Ordovician Champlanian Platteville McGregor Wisconsin(7) Side view
Closer view
End view
Endoceras sp. Ordovician Champlanian Platteville McGregor Wisconsin(1) Side view
End view
Endoceras sp. Ordovician Champlanian Platteville McGregor Iowa(86) Side view
End view


Charactoceras

Name Age Stage Formation Member Information Photos
Charactoceras laddi Ordovician Cincinnatian Maquoketa Elgin Iowa(13) Side view
Edge view
Closer side view
Closer edge view


Michelinoceras

Name Age Stage Formation Member Information Photos
Michelinoceras sp. Ordovician Cincinnatian Maquoketa Elgin Iowa(3) Side view
Closer view
Cross section
Michelinoceras sp. Ordovician Cincinnatian Maquoketa Elgin Iowa(14) Side view
Closer view
Closest view


Spyroceras

Name Age Stage Formation Member Information Photos
Spyroceras sp. Ordovician Cincinnatian Maquoketa Elgin Iowa(13) Side view
Closer view
Closest view
Spyroceras clermontense Ordovician Cincinnatian Maquoketa Elgin Iowa(14) Side view
Closer view
Close view