Ancient Oceans EarthCache
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First Found By:
InIt4thecache
On February 13, 2008
PARKING AREAS
Top parking is best. = N 41° 13.234’ W 081° 41.909’
Bottom parking = N 41° 13.130’ W 081° 42.194’
Ancient Oceans
During the time period when oceans covered most of Ohio,
silt, sand, clay and pebbles deposited on the bottom, were
compacted together. Constant pressure form the overlaying materials
and heat from geologic processes deep with the earth eventually
formed the sedimentary rock that you see here.
Today in Hinckley
Reservation, two rock layers formed from sediments in the ancient
ocean have been exposed by erosion. In front of you are large
boulders and rock walls that are composed of sand and pebbles. This
rock layer is known as the Sharon Conglomerate, the youngest rock
in our area. The Conglomerate here is exposed at the highest
elevations in Northeast Ohio. Below this layer is a group of rock
known collectively as the Cuyahoga Formation. The main rock type
from this formation found in the Hinckley Reservation is composed
of sandy silt and clay. This Shale is exposed along the east branch
of the Rocky River and numerous creaks in the
reservation.
To claim this as a
find:
1)
Follow the path down and explore the rock ledges below. Upload a
photo of your adventure.
2) Using your GPSr determine
the elevation change from the bottom to the top of this rock
formation. Email Team RAGAR the answer in
feet.
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