LEP SSUNBURY SEV EOE TOLIO: 
CONTENTS. 
Introduction. Buena Vista. 
Historical review. Vanceburg. 
Distribution. Northern Ohio. 
Central Ohio. Berea. 
Rattlesnake Creek near Sun- Bedford. 
bury. Chagrin Falls.. 
Rocky Fork. Warren. 
Southern Ohio. Orangeville. 
Benner’s Hill. Conclusion. 
Stony Creek. Note. 
Waverly. 
INTRODUCTION. 
OVERLYING the well-known Berea grit of Ohio isa black shale 
of somewhat variable though never very great thickness. It 
forms, however, a marked horizon in the Waverly series, and is 
very presistent in outcrop, extending from the Ohio river to 
northern Ohio, thence east nearly to the Pennsylvania line, and 
perhaps enters the state. On the south it crosses into Kentucky; 
but its extent in that state is not known. The older names, the 
Waverly black slate of Andrews and the Berea shale of Meek, 
when first applied to this shale were preoccupied, being in use 
for other geological divisions. 
Professor Hicks at a later date gave the name ‘Sunbury shale”’ 
to a rather meager exposure on the bank of Rattlesnake Creek, 
about two miles east of the village of Sunbury, in the eastern 
part of Delaware county, Ohio, which is the first distinctive 
geographic name applied to this shale and therefore the one 
which, it appears to the writer, ought to be accepted for this 
formation. Recent examination of outcrops of this shale at 
different localities across the state has acquainted the writer with 
its characteristics, and furnished him with some facts which are 
perhaps worthy of record. 
‘Published by permission of Professor Edward Orton, Jr., state geologist of Ohio. 
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