342 GEOLOGY OF OHIO. 
y 
solution of the question, ‘‘Do Hamilton fossils extend through the whole 
of the blue limestone ?” —a question propounded by the Director of the 
Survey for the purpose of testing the evidence. It is deemed best here to 
present a general 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 north-western Ohio. This 
section agrees in all its details with that of Delaware county, except the 
attenuation here of the Olentangy shale of Delaware county. Indeed, 
this shale, which in the Report of Progress for 1869 is regarded as Ham- 
alton, is seen to be entirely wanting in most places in Defiance county, 
the thin, tough black slate layers lying immediately on the hard beds of 
the Tully limestone: 
GENERAL SECTION OF THE Rocks oF PAULDING AND DEFIANCE COUNTIES. 
No. 1. Black slate. (Huron shale of the Ohio reports } 
‘* 2. Bluish shale. (Olentangy shale of Delaware county.) 
‘* 3. Blue and blackish limestone; hard and silicious. (The 
Tully limestone of New York State.) 
** 4. Blue limestone; the whole, including the lowest ob- 
served part of this, holds Hamilton fossils. (The 
Hamilton limestone of New York.) 
‘* 5. Saccharoidal, very fossiliferous limestone. (The Delhi 
beds of Delaware county; the Corniferous limestone 
of New York.) 
} 
‘“ 6. Buff, magnesian limestone; the upper half is 
thin-bedded, (The Onondaga limestone of 
New York State.) 
.* % Quartzose sandstone; con- 
glomeratic in Delaware 
county. (The Oriskany of 
New York State.) 
‘* 8. Heavy-bedded magnesian 
limestone. (Phase No. 2 
of the Waterlime of 
Ottawa county.) 
9. Irregular and wavy-bedded, 
compact limestone. (Phase 
No. 3 of the Waterlime of 
Ottawa county.) 
