Celina in Mercer County, Ohio — The American Midwest (Great Lakes)
Wisconsin age glacial deposits of clay silt soils cover dolomite limestone bedrock in this area.
Geologists tell us that this limestone bedrock was created 400 million years ago during the Silurian
Geologic age: During this age the area we now know as Mercer County was part of a coral sea located
e south of the equator. Fossils of coral, brachiepods, trilobites, and cephalopods are typical of those
found in the local limestone quarry. The life forms on earth during this geologic age were marine. Plant
life was just emerging on land during this period. This limestone bedrock, an important economic
resource material, helped establish this area's construction and farming community.
As the geologic ages progressed, this part of the North
American continent moved north and raised in elevation.
The Teays River flowed through this area of Mercer County until the first glacier covered the
region. It was the last glacier, known as the Wisconsin, that contoured the land as we
now know it. The lake location is situated on a
glacial till plain between recessional moraines.
The swamp area that was converted to the Grand
Reservoir was formed
By TeamOHE, May 18, 2019
1. Geologic History Marker
by the arrangement of the Wabash recessional moraine. This low
mound of land forms the north side of the lake. The land to the south slowly raises providing
the drainage basin that still fills the lake. lt is believed that the Grand Reservoir was built
on a swampy ground that is the remains of a short lived, post-glacial lake.
By TeamOHE, May 18, 2019
2. Geologic History Marker
Topics. This historical marker is listed in these topic lists: Paleontology • Parks & Recreational Areas • Waterways & Vessels.
Location. 40° 32.64′ N, 84° 34.262′ W. Marker is in Celina, Ohio, in Mercer County. Marker is on South Main Street (U.S. 127) 0.1 miles south of Lake Shore Drive, on the right when traveling north. Touch for map. Marker is in this post office area: Celina OH 45822, United States of America. Touch for directions.
Other nearby markers. At least 8 other markers are within walking distance of this marker. Lake Improvments (here, next to this marker); Grand Lake St. Marys (here, next to this marker); Points Of Intrest In Mercer And Auglaize Counties (here, next to this marker); Mercer County Courthouse (within shouting distance of this marker); Grand Lake St. Marys Points Of Interest (within shouting distance of this marker); Celina City Hall (within shouting distance of this marker); Prehistoric Indians / Historic Indians (within shouting distance of this marker); Mercer County Veterans Memorial (approx. 0.2 miles away). Touch for a list and map of all markers in Celina.
Credits. This page was last revised on February 11, 2021. It was originally submitted on February 9, 2021, by TeamOHE of Wauseon, Ohio. This page has been viewed 23 times since then. Photos: 1, 2. submitted on February 9, 2021, by TeamOHE of Wauseon, Ohio. • Devry Becker Jones was the editor who published this page.