322 GEOLOGY OF OHIO. 
feet below this, in the bed of a stream, alternate layers of argillaceous 
and sandy shales are exposed. 
The top of the quarry east from Mansfield is twenty feet below the tcp 
of this coarse sand-rock, and is a continuation of it, the town resting 
upon this formation, which crops out on all sides of it. About sixty feet 
of the rock is here exposed. It is all much broken; the upper thirty 
feet in thin layers, the lower thirty feet in layers of from one to six feet 
thick. Much of the rock is beautifully colored in wayed bands and lines 
of black, yellow, and red, as delicately shaded as the best artificial grain- 
ing of wood. Very beautiful specimens can be obtained, and if it were 
harder it would make a very ornamental building stone. It dresses 
_ smoothly and endures exposure well, but is soft and easily worn away by 
abrasion. 
On Brushy Fork, near Millsborough, about six miles west of Mansfield, 
and thirty-five feet above the Mansfield quarry, is the outcrop of the same 
rock, of which the following is a section : ) 3 
FT. 
1. Coarse, shaly sandstone in broken layers..-.....-22...2.2..----------. 12 
2, Ferruginots sandstone, with waved lines of stratification .......--- 6 to 10 
3. Coarse, massive sandstone, with irregular veins of iron...--.........-. 6 
AS Silly SRNR MES 555 GanGos FOG508 bob b00 coobas BODO B4h4 Bao bus 66 Hod6ob Se 8 
5. Blue argillaceous shale, with bands of hard, fine-grained sandstone to 
bottom of exposure. 
The upper numbers are the thinning out of the Mansfield rock, the 
equivalent of the Waverly Conglomerate. 
On the opposite side of the stream, the yellow sand-rock on Newton 
‘Gilkinson’s land is about thirty-five feet thick, coarse, ferruginous, with 
black iron streaks. There are about ten inches of light-colored and firm 
‘stone. All the rest, so far as exposed, is worthless for building purposes, 
The rock at bottom is blue argillaceous shale, with hard blue bands, 
bearing a close resemblance to the Hrie shales; no fossils discovered. In 
places, interstratified between the layers of the yellow sandstone, there 
is a layer of ten to twelve inches of white argillaceous shale, which, when 
disintegrated, bears a close resemblance to the fire-clays of the Coal Meas- 
sures. Outcrops of this rock are to be seen northward, near Lexington, 
and between Lexington and Bellville, containing quartz pebbles and 
many nodules of soft iron ore; all the rock, in thin layers, extending to 
the tops of the hills, making the connection complete between the Mans- 
field and Bellville quarries. The Clear Fork here flows through a broad © 
alluvial valley, bordered with heavy hills of modified Drift, generally 
sandy, in places composed of coarse, water-worn pebbles and bowlders, 
