340 GEOLOGY OF OHIO. 
magnesian limestone, like the Onondaga. The outcrop here causes a 
little rapid in the river, although the beds are not bare except where 
quarried, the water coming in contact with bowlders only. The most 
common fossils are Favosites, Acervularia, Coenostroma, and Cyathophy!- 
loids. ‘There is also occasionally a distinct crinoidal structure. Some of 
the corals are blackened, and smell of petroleum. Oil also gathers on 
the surface of standing pools of water about the quarry. 
The Onondaga Limestone.—This is the lowest member of the Corniferous 
group in Ohio. It outcrops further up the Auglaize than the last described, 
and is burned for lime by Frank McEvoy, S. E. 4 sec. 5, in Brown town- 
ship. The beds here are thinner than where exposed at a lower horizon. 
These heavier magnesian beds are quarried, in connection with the 
Oriskany, at Charloe, including also some of the upper layers of the 
Waterlime. The river here is thrown into a long series of rapids in 
passing these more persistent beds. This quarry is south of the mouth 
of Blue Creek, on the west side of the Auglaize, and shows, according to 
the statement of the proprietors, the following thickness for the several 
members: 
SEcTION AT CHARLOE. 
No. 1. Sandstone, having the appearance of that at Grand Rapids, 
in Wood county; hard; sawn off for flagging; suture- 
joimtedsuponwNonZieiscenonliysiar ane cen ces eae re neceee 6 in. 
“« 2. Even-grained magnesian limestone, of a buff color, contain- 
ing nodules of chert; sawn into handsome building 
blocks) and’ exported largely nies acto neeenriesssetecmenace 4 ft. 
“« 3. Dark drab; soft; magnesian; with some cavities which of- 
tenvcontainistraw-colored calcite meee reece Hes Paulie 
“ 4, Rough; blue-drab; close-grained; heavy and hard, or brec- 
ciated and vesicular; with some pyrites; in one bed, of 
At NCAST as coceecevdiccnsedacd ened du rcslseas Mavectscomeaetel ccmnasmememmuattctits She eGo 
TO tali seems eee MCs ay RLU eae ae OR oO ONS SAL Ome 
Of this section, No. 1 is the base of the Oriskany; No. 2 is a stone 
seen at other places embraced within the Onondaga limestone; Nos. 3 
and 4 are the uppermost members of the Waterlime. (See Geology of 
Wood County.) 
The Oriskany Sandstone—In north-western Ohio the beds supposed to 
represent the Oriskany of New York play an important economical part 
in the geology of that district. They do not exceed an aggregate thick- 
ness of twenty feet, and are sometimes less than ten; but from the quar- 
ries that have been opened in them in different counties they have sup- 
plied stone for the most important structures. The horizon at which 
the sandy phase appears exhibits some variation, as has been mentioned 
in reports on Wood and Sandusky counties. The arenaceous character 
