. The Geology of Minnesota . 7 8 St Paul. 6 Sections showing the thickness and character of strata of the Trenton and Hudson River periods at(6) St. Paul, and { 7) Goodhue, and (8 ) Fillmore counties, Minnesota. COERELATION OF STRATA. Ixxxix PER/OD. .HUDSON RIVER Oh CI NCI N NATI PERIOD. I Trenlon prouA. UivcoL orout) ]_, 0 T a. I tv t pro u^ib. 8 2 5- ^. XC THE PALEONTOLOGY OF MINNESOTA. The St. Peter sandstone has a wide geographical distribution, being known byoutcroppings in Canada, Michigan, Wisconsin, Minnesota, Iowa, Illinois and Missouri,and through deep borings in India
. The Geology of Minnesota . 7 8 St Paul. 6 Sections showing the thickness and character of strata of the Trenton and Hudson River periods at(6) St. Paul, and { 7) Goodhue, and (8 ) Fillmore counties, Minnesota. COERELATION OF STRATA. Ixxxix PER/OD. .HUDSON RIVER Oh CI NCI N NATI PERIOD. I Trenlon prouA. UivcoL orout) ]_, 0 T a. I tv t pro u^ib. 8 2 5- ^. XC THE PALEONTOLOGY OF MINNESOTA. The St. Peter sandstone has a wide geographical distribution, being known byoutcroppings in Canada, Michigan, Wisconsin, Minnesota, Iowa, Illinois and Missouri,and through deep borings in Indiana, Ohio and Kentucky. In the northwest it consistsalmost entirely of silica, but in the vicinity of Cincinnati, whei-e it is the principal sourceof the blue lick water of the artesian wells, it contains a considerable amount ofcalcareous material. Stones River group. This name was proposed by Prof. J. M. Safford in 1851 (Amer. Jour. Sci. and Arts,2d ser., vol. XII, p. 352) for the Lower Silurian strata of central Tennessee which in hisGeology of Tennessee, 1869, we find fully described under the names Central limestone, Ridley limestone. Glade limestone and Carters Creek limestone. In thelatter publication the group name is abandoned under the misapprehension that thelimestones so designated are strictly equivalent to the Trenton group of New Y
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