Brachiopoda and stratigraphy of the Aplington Formation of northern Iowa

Abstract

The Aplington formation, formerly included with the Sheffield beds, is distinguished and type section indicated. Faunal comparisons apparently indicate that the age of the formation is Lower Mississippian. Three new genera of brachio- pods, one productid and two spiriferids, are diagnosed. Seventeen species are de- scribed and illustrated, all as new forms.