OF DENISON UNIVERSITY. 
lOI 
(i6). Siliceous flags with Atrypa reticularis and Strophomena 
rhomboidalis. Fifty or seventy-five feet of this constitutes 
the Berea grit proper, which is separated from the remainder 
in many places by a thin seam of bitumenous shale contain- 
ing Lingula metie and Orbiculoidea meeki. 
Bedford Shale. (Hamilton facies in Chemung association.) 
Upper portion, choccolate shales _ _ _ - - 40 ft. 
Lower portion, greenish shales with very numerous fossils, Paloeoneilo 
bedfo 7 'densis^ Macrodon hamiltoncE^ Microdon bellistriatus^ Chonetes 
scitula, Orthis vanuxenii, etc. - - - - - 15 ft. 
Black or Hamilton Shale. 
The lower division cannot greatly exceed 500 feet, the middle 
division measures less than fifty feet, the upper one hundred and 
twenty-five. 
To indicate that the section above given is not local and acci- 
dental but represents the typical sequence in the larger part of the state 
we may compare three favorable localities as distant as possible. We 
select Sciotoville in the southern part of the state and a magnificent 
exposure near the western line of Ashland county to represent the 
northern, while Rushville as supplemented by western exposures, rep- 
resents the central. The Ashland section is first given. 
We venture to place in parallel columns the section actually 
measured in continuous exposure and that published in the Ohio Geo- 
logical Survey report as a correlated section in the same part of the 
state. 
Near Lyon Falls. 
Unexposed 20 ft. 
Ferrugineous zone with Phillipsia ser- 
raticaudatus, etc 10 ft. 
Shales and freestone 20 ft. 
Freestone, fossils of upper Waverly 
10 ft. 
Shales and freestone 8 ft. 
Massive freestone with Prodnctus 
arcuatus : 10 ft. 
Shales and freestone 50 ft. 
Conglomerate II 18 in. 
Sandy shale, Prothyris meeki, Al- 
lorisma, etc 5 ft. 
Ohio Geological Report. 
Carboniferous conglomerate. 
Argillaceous and siliceous shales 
1 70-250 ft. 
