The most interesting feature of the Interstate park of Minnesota and Wisconsin, at the Upper Dalles of the Saint Croix river, consists in many large and small water-worn rock potholes, which are also, in their large examples, often called “wells.” The languages of Germany, Sweden, and Norway give the name “giants’ kettles” to such cylindric or caldron-shaped holes of stream erosion, which are everywhere characteristic of waterfalls and rapids, especially in crystalline rocks. Their Spanish name, remolino, used in the Republic of Colombia, has been recently advocated by Mr Oscar H. Hershey for adoption by geologists;* but either the common English term, potholes, or the German and Scandinavian designation, apparently alluding to mythical giants, seems preferable.

These potholes, occurring most numerously near the steamboat landing of Taylors Falls, Minnesota, at the central part of the Upper Dalles, and within a distance of 50 rods northward, are unsurpassed by . . .

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