Abstract
The brachiopod superorder ORTHOIDEA is represented in the Cedar Valley limestone by two genera. Rhipidomella has a single species, small, rare, and limited to the Atrypa bellula zone in the immediate vicinity of Davenport, Iowa. Schi2opborid 'has four species which have limited vertical ranges and distinct, easily recognized characteristics and are, therefore, good index fossils. Individually the species are locally abundant, in one or two instances being the dominant component of a one-foot stratum. Schizophoria, however, is much less common than Atrypa and S,tropheodonta. A striking featuLre of the Schizophorias of the basal Cedar Valley beds is the distinctly light purplish red color of the shells. In deep well drillings fragments of these colored shells are easily recognized and are a ready means of identification of the lower zones of the formation.
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