The Ohio SSCaturalist, 



PUBLISHED BY 



The Biological Club of the Ohio State Uni'versity, 



Volume VIII. 



MARCH. 1908. 



No. 5. 



TABLE OF CONTENTS 



Stauffer— The Drvoiiian Section on tlie Ten Mile Creek, Lucas County, Ohio 271 



Griggs— On the Cytology of Synchytiium 277 



HiNE— Deatli of Prof. W. A. Kellerman 286 



Hubbard— Two Notable Landslides 287 



OsBoRN— Occurrence of Typhlopsylla octactanus in Ohio 289 



HiNE— Note on the American Barn Owl 290 



THE DEVONIAN SECTION ON TEN MILE CREEK, LUCAS 



COUNTY, OHIO. 



Clinton R. wStauffer. 



The Devonian formations of Ohio are fairly well known in 

 those portions of the state where they constitute the bed rock. 

 This is especially true in the central strip of outcrop where the 

 shales and limestones of this System sometimes form cliffs fifty 

 to seventv-fiYe feet high. In northwestern Ohio, however, the 

 land lies but little above drainiage level and the covering of 

 drift is frequently so deep that the streams do not cut through it. 

 Hence our knowledge of most of the Devonian formations in this 

 portion of the state is limited to a few outcrops with incomplete 

 and more or less vmsatisfactory sections. 



In this northwestern area, the Columbus limestone^ is exten- 

 sivelv quarried at White House and occasionally, on a much 

 smaller scale, at a number of other places. The Delaware lime- 

 stone forms only occasional and meagre outcrops, while the 

 Olentangv shale is either entirely wanting or is inseparable from 

 the other Brian formation. The Ohio shale outcrops at several 



(1) Ohio Classification of the Devonian and extreme upper portion 

 of the Silurian as approved by Dr. Charles S. Prosser. 



Chautauciuan ] f Cleveland sh. 



Devonian 



and 

 Senecan 



Brian 

 Ulsterian 



Ohio shale -j Chagrin form. 

 J { Huron sh. 



Olentangv shale 



Delaware limestone 



Silurian 



Columlnis limestone 



UNCONFORMITY 



[ Lucas Is. 

 Cayugan Monroe foruL { Sylvania ss. 



[ Tymochtce form. 



