. The American journal of science and arts . determined by more extended ob-servations. This supposition is rendered more plausible by theunusual course of the Wisconsin river, it suddenly turning froma south to a west direction. In its valley, however, where itflows towards the west, no bowlders are found except the smallpebbles brought down by the river itself. Throughout the extensive tract defined as the lead region, leadore may be sought for with prospect of success on every town-ship and on almost every square mile. And fortunately it is sowell watered, and the little streams have so rap
. The American journal of science and arts . determined by more extended ob-servations. This supposition is rendered more plausible by theunusual course of the Wisconsin river, it suddenly turning froma south to a west direction. In its valley, however, where itflows towards the west, no bowlders are found except the smallpebbles brought down by the river itself. Throughout the extensive tract defined as the lead region, leadore may be sought for with prospect of success on every town-ship and on almost every square mile. And fortunately it is sowell watered, and the little streams have so rapid a fall, thatpower for furnaces may almost always be obtained near the discoveries are continually made, and with every one fur-ther light is thown upon the true character of the ranges of fis-sures containing the lead and copper ores ; by which result theycan be traced with greater certainty from one tract to another,without depending entirely on the present imperfect system ofprospecting. Wisconsin and Missouri Lead Region. 37. Beneath the diff limestone is a thin stratum of bkie Kmestone,and this rests on a body of brown sandstone. As one goes fromthe southern townships of Wisconsin towards the north, this bkielimestone is observed to become higher and higher in the hills,and the lead diggings to be every where above it. Though thesandstone rocks come out in bold bluffs on the sides of the hills,no veins of ore are ever found in them ; but in the cliff lime-stone above, they are found, though the rock and its fissures liehid under a great depth of soil. The section annexed (Fig. 1)represents this order of superposition, the character of the fissures,and about the relative proportion that the three rocks bear in thehills near Mineral Point. Fig. 1. Cliff limestone. Blue limestone. Sandstone. These fissures are of every degree of width, from fifty feetdown to thin cracks ; all of them do not contain ore ; the largechambers, when they have any mineral in them, are l
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