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I.
Watershed Setting
B. Geology
The Darby Watershed like many watersheds was shaped through glaciation.
The underlying bedrock of the watershed is either limestone or dolomite
of Silurian or Devonian age. Very
few bedrock outcrops occur in the watershed because of the thick glacial
deposits that blanketed the area. The
glacial till ranges from 700 feet thick to only a few feet in the headwaters
area and in western
Franklin
County
. The glacial setting in the
watershed is illustrated in Map 2.
A short narrative for each glacial setting will be provided on the map.
The terrain of the watershed varies considerably from the mouth to the
headwaters. In the headwaters, the
Bellefontaine Outlier and the Cable Moraine Complex created rolling hills and
steeper slopes than found in much of the watershed.
From the headwaters the terrain levels off into the Darby
Plains. The
Darby
Plains
is the most significant geological feature within the watershed.
The
Darby
Plains
is well suited to agriculture and has a fertile top soil that is up to two feet
thick in some areas. The large
amount of melt water and moraines shaped the path of the Darby
Creeks.
Section Navigation:
1. Pre-Glacial
2. Glacial
3. Formation of
Darby
Creeks
4.
Darby
Plains
  
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