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132

Mineralogy

Stalactites are found in Limestone caverns near Dubuque on the Mississippi river.

Calcareous Tufa incrusting moss, leaves &c near Milwaukee on the canal; in the gorge below the Falls of St. Anthony; at the mouth of the Boia Brule, and probably at many other places.

Septaria. In the redish brown clay soil along the shore of Lake Superior between the Montreal river and La Pointe.

Gypsum,- or Plaster of Paris is found in small masses in the sandrock on Lake Superior- and also at Sturgeon Bay in Brown county. At this last locality it is believed that beds of sufficient extent to be workable value might, by proper explorations by competent persons, be found. It has a fine flesh color, and appears to be quite pure.

75

132

Mineralogy

Stalactites are found in Limestone caverns near Dubuque on the Mississippi river.

Calcareous Tufa incrusting moss, leaves &c near Milwaukee on the canal; in the gorge below the Falls of St. Anthony; at the mouth of the Boia Brule, and probably at many other places.

Septaria. In the redish brown clay soil along the shore of Lake Superior between the Montreal river and La Pointe.

Gypsum,- or Plaster of Paris is found in small masses in the sandrock on Lake Superior- and also at Sturgeon Bay in Brown county. At this last locality it is believed that beds of sufficient extent to be workable value might, by proper explorations by competent persons, be found. It has a fine flesh color, and appears to be quite pure.

75