Science: Beavers at Troy

For years geologists have wondered what physiographic (earth-changing) agency caused wide alluvial plains—like the nine-mile valley floor east of Troy, N. Y.—which are out of all proportion to the deposits attributable to their present small streams. Last week Geologists Rudolf Ruedemann and Walter J. Schoonmaker of the New York State Museum solved the riddle, and at the same time implied that either geologists should get outdoors more or, when they did get out, should be looking at other things besides rocks. The physiographic force which had caused the Troy plain, and others like...