Date of Award


Degree Name

Master of Science


Geological and Environmental Sciences

First Advisor

Dr. William B. Harrison III

Second Advisor

Dr. W. David Kuenzi

Third Advisor

Dr. W. Thomas Straw

Access Setting

Masters Thesis-Open Access


Spiriferid brachiopods of the Middle Devonian Silica Formation in northwestern Ohio and southeastern Michigan show many Features that are useful For paleoecologic interpretation. This study is undertaken to examine and interpret the paleoecology and paleobiology of six spiriferid brachiopods Mucrospirifer prolificus, Mucrospirifer grabaui, Mucrospirifer profundus, Mucrospirifer mucronatus, Paraspirifer bownockeri and Spinocyrtia euryteines. All are very abundant and can be easily collected from quarries in the Silica Formation near Sylvania, Ohio.

Fourteen different morphologic characteristics have been tabulated for all specimens used in this study. These characteristics allow interpretations of the ontogenetic de velopment and ecologic relationships of the six studied species to their physical environment. In addition to measurable morphologic characters, encrusting epizoans on the shell surface during the brachiopods life and borings or other trace of predators can be used to estimate the brachi opod life orientations and substrate relations.

Included in

Geology Commons