HURON COUNTY. : 3803 
For a few rods below this exposure the bed of the stream and bluffs are 
composed of Drift, mainly the debris of local rocks, the first rock seen 
beyond being that mentioned above, inclined at an angle of 75°, and 
standing like a dike directly across the bed of the stream. 
The character of the Drift banks is indicated by the following section 
_of the bluff at this dike: i 
We2s 
Dy 
he 
SARI 
SEP CAE 
This “turtle-back,” or pudding rock, is a very peculiar formation, 
composed of a mass of indurated mud-balls, sharply separated from the 
including strata with the internal structure of the slag of a smelting fur- 
nace. If a mags of thoroughly worked, tenacious clay could be slowly 
pushed forward over a gentle slope, constantly folding upon itself in the 
manner in which the slag flows from a furnace, a structure very similar 
to that found in these strata would be produced: Studied at this point 
alone, where their peculiarities are the most marked, an explanation of 
the mode of their formation is very difficult.* 
Following the stream still further downwards, the rock disappears both 
from the bed and bluffs of the stream, first reappearing near the little 
village of Maxville, where it has a slight dip to the north which soon in- 
creases to 19°. A little north of this, after passing a fissure in the rock, 
the dip is 184° north 60° west. Still further north, near the west line of 
Bronson township, a rock exposure at the bridge, over Huron River, ex- 
hibits another phase of this general disturbance. 
The following is a profile of part of the exposure: 
4 
A—Sandstone of Bedford shales. 
a B—Cleveland shales. a es [ES 
C—Clay and debris of Erie shales. Pua SCeN ane 
Ne, SHIN 
C eas 
“In the valley of the Cuyahoga, on the same horizon, the rocks exhibit a slight ap- 
proach to this structure, and it is there apparently due to sea weeds. -It would seem 
that in this locality a mass of fucoid plants, rolled and tumbled’ by the waves, were 
spread upon the surface and buried under a deposit of clay and sand, which, when har- 
dened into rock, has retained the irregular, distorted, internal structure thus given to it. 
