Report of a Two Day Underwater Survey of Selected Historical Sites at Apostle Islands National Lakeshore With Considerations for Research, 1982 (Classic Reprint) - Tapa dura

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Excerpt from Report of a Two Day Underwater Survey of Selected Historical Sites at Apostle Islands National Lakeshore With Considerations for Research, 1982

The Apostle Islands are remants of Pleistocene glaciation activity. The underlying strata is a 500 milion - year - old brown sandstone upon which glacially deposited soils and gravels lay. The vegetation consists primarily of broadleaf and coniferous species and has been termed northern mesic forest. The soils are mixed and range from heavy clay with little drainage to well drained sandy areas. Beach materials are primary glacial lake beach sands reduced from the sandstone strata. Subnerged bottomlands were sandy and solid in the areas emined. Water clarity is good with visibility during the survey ranging from 30 to 50 feet.

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