Doan Brook Watershed Partnership 3 pm, Sat, June 7, 2014 Roy Larick Bluestone Heights Doan Brook gorge, looking southeast Doan Brook Watershed Partnership USGS LiDAR underlay; Google Earth aerial viewer for the sandstone terrace Maple Ridge Turkey Ridge RSVP [email protected]216-325-7781 Doan Brook Gorge walking tour With support from Natural History Meet: Fairhill Partners campus: 12200 Fairhill Road, Cleveland, OH 44120
Walk the Doan Brook gorge from the Lower Lake downstream to Ambler Park. Here, the Portage Escarpment has several hard rock layers. We trace a glacial meltwater channel from the top of the Berea Sandstone through the Euclid bluestone. In numerous stops, see how early settlers used the rocks and waters for mills and quarries. Learn the natural base for suburban development. Comprehend the issues for stream conservation. Supported with a grant from Cuyahoga Arts & Culture, 2014.
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Between Turkey and Maple Ridges, glacial melt water carved sandstone and shale. Bedrock exposures evince the Age of Fishes sea of 370 million years ago.
The Natural History gorge hike explores the bedrock and the deep history of fast-changing natural and cultural features.
USGS LiDAR underlay; Google Earth aerial viewer
bluestone terrace
sandstone terrace
This event sets the stage for history hikes on the gorge’s Early Settlers (8/23) and Suburbanites (19/18).
Maple Ridge
Turkey Ridge
Doan Brook rocks
During the Late Devonian Period, 370 million years ago, our region lay near the Equator, in the Ohio Basin Sea. The nearest land was 150-200 miles to the east. Chagrin and Cleveland Shale fossils indicate a muddy sea bottom. The sea had many fish; few were fossilized.
Redrawn from Hannibal & Feldmann
The Explorer 27(1), 1985
Age of Fishes Ecology
Doan Brook and the Portage EscarpmentJust 23,000 years ago, the last glacial advance bulldozed the Portage Escarpment to create two terraces, one atop the Berea Sandstone and, just below, atop the Euclid bluestone. To create its gorge, Doan Brook cut through these hard rocks and underlying soft shale.
Gulch and GulfIn early settler days, a deep ravine with craggy cliffs could be called a gulch. A wider ravine with vertical sides could be called a gulf. In the Berea Sandstone, Doan Brook carved its gulch. In the bluestone and underlying shale, the brook dug its gulf.