Ohio History Journal

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MILL CREEK PARK

MILL CREEK PARK

 

AND THE

SOURCE OF MILL CREEK

 

 

BY CHARLES BURLEIGH GALBREATH

 

When the earth took spherical and solid form, it

presented in the earliest ages whose records have been

deciphered on the rocks, a surface of land and water.

The continental areas were then limited and low.

Much of what now constitutes the dry land was under

water. In North America the land portions were chiefly

north of the Great Lakes. What is now the Mississippi

valley was then covered by a great inland sea of com-

paratively shallow depth.

It should be remembered that sedimentary rocks, or

those formed and placed by the action of water, are de-

posited in successive layers or strata. At the basis of

all such rock formation is what, for a better designa-

tion, we may call the primordial bed-rock. Scientists

differ as to its origin. Those who still accept the nebular

hypothesis of Laplace claim that this bed-rock is a part

of the original crust of the earth and was formed when

the surface changed, in cooling, from a molten to a

solid condition. Others claim that the heat that pro-

duced this came from the center of the earth. It is

enough for us to know that this primordial bed-rock

exists; that its condition is due to heat; that the ele-

ments composing it are of igneous or metamorphic

(137)