Recent quarry operations near Palo, Linn County, Iowa, have exposed many ventifacts at the contact of the Iowan till and Peorian loess (Fig. 1). The quarry is located in the SW. Qt., Sec. 30, T. 84 N., R. 8 W., and lies near the crest of a rock controlled hill of Cedar Valley limestone. The rocks in the pebble band range from small pebbles a fraction of an inch in diameter to boulders three feet or more in diameter. These consist of granite, rhyolite, diorite, greenstone, quartzite, quartzite conglomerate, chert, jasper, and milky quartz. No limestone was seen in the pebble band and very little in the till. An explanation may lie in the fact that the underlying Cedar Valley limestone weathers rapidly.
Proceedings of the Iowa Academy of Science
©1945 Iowa Academy of Science, Inc.
Wilson, L. R.
"Pebble Band Ventifacts on Iowa Till in Linn County, Iowa,"
Proceedings of the Iowa Academy of Science, 52(1), 235-241.
Available at: https://scholarworks.uni.edu/pias/vol52/iss1/28