396 N. H. Winchell on the Hamilton in Ohio. 
pounded by the Director of the survey, for the purpose of test- 
ing the evidence. It is deemed best here to present a gene 
section of the rocks of Paulding and Defiance Counties, in order 
to express clearly the position of the beds that have furnished 
the writer the only Hamilton fossils found in northwestern 
Ohio. This section agrees in all its details with that of Dela- 
ware County, except the attenuation here of the Olentangy 
shale of Palswass County. Indeed, this shale, which in the 
Report of Progress for 1869 is regarded Hamilton, is seen to be 
entirely wanting in most places in Defiance County, the thin, 
tough, Black Shale layers lying immediately on the hard beds 
of the Tully limestone. 
Diagram showing a section of the rocks of Paulding and Defiance Counties, Ohio. 
No. 1. Huron shale, of the Ohio Reports. No. 2. Bluish 
shale, local; the Olentangy shale of Delaware County. 
stone: the Delhi beds of Delaware County ; the Corni/- 
erous limestone of New York. No.6. Buff, magne- | 
sian limestone; the upper half is in thin beds; the 
a limestone of New York. No. 7. Sandstone; conglomeritic in Del 
ware County; the Oriskany of New York. No. 8. Heavy-bedded, magnesian 
limestone; “phase No. 2,” of the Waterlime; Ottawa County. No. 9. Thin, 
vy, compact beds, ‘phase No. 3,” of the Water-lime ; Ottawa County. 
2 
which it lies. In northwestern Ohio, No. 2 is very muc 
duced from its observed thickness in Delaware County (80 feet), 
and is usually altogether wanting. It is evenly but very thinly 
bedded, and jis closely related to the Huron shale (No. 1), with 
which it is interstratified in Delaware County. 
No. 3.—This holds the place and exhibits most of the char- 
acters of the Tully limestone of New York. Its identity 8 
not established on paleontological evidence. It is quarried @ 
Florida, on the Maumee, and by Mr. Dilz, near Defiance. At 
the former place, it is immediately overlaid by the Black Shale 
Its thickness is 6-10 feet. 
No. 4 has a thickness in Delaware County of thirty-five feet, 
and probably it will not vary very much from that, on the west 
