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Michigan Pictured Rocks
It is surprising to see how little the action of the stream has worn away the rocks which form its bed. There appears to have been hardly any recession of the cascade, and the rocky bed has been excavated only a foot or two since the stream assumed its present direction. It seems therefore impossible that the river could have had any influence in excavating the Chapel itself, but its excavation must be referred to a period when the waters of the lake stood at a higher level.
"Near the Grand Portal the cliffs are covered, in places, with an efflorescence of sulphate of lime, in delicate crystallization; this substance not only incrusts the walls, but is found deposited on the moss which lines them, forming singular and interesting specimens, which, however, cannot be transported without losing their beauty.
At the same place we found numerous traces of organic life in the form of obscure fucoidal markings, which seem to be the impressions of plants, similar to those described by Prof. Hall as occuring in the Potsdam sandstone of New York. These were first noticed at this place by Dr. Locke, in 1847."
Upper Michigan
Page 17
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