| 11. | Valley soils are formed from a mixture of glacial till and lacustrine clay.
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| 12. | These soils are formed from glacial till and glacial outwash, respectively.
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| 13. | A boulder-rich glacial till occurs to the east of the creek.
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| 14. | This is covered with Glacial Till from the quaternary ice age.
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| 15. | Glacial till covers much of the river bottom in its headwaters.
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| 16. | At some later date, undisturbed sediments, or glacial till may fill the collapse zone.
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| 17. | The tundra vegetation and bare glacial till deposits underwent succession to mixed deciduous forest.
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| 18. | These rocks were deposited as extensive moraines and glacial till.
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| 19. | Erie's bedrock is Devonian shale and siltstone, overlain by glacial tills and Ohio rivers.
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| 20. | Some of the ridges are made entirely from glacial till.
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