Natural Resources, School of
Date of this Version
Discontinuous Pleistocene pond deposits occur along the valley sides of Dankworth Canyon southeast of Lewellen, Nebraska. At one locality the beds exposed in a channel-fill up to six feet thick consist of sand-sized carbonate-rich sediments deposited in alter nating light and dark layers resembling varves. Microscopic examination of disaggregated samples reveals that most of the sediment consists of sand and silt often cemented into tubes. Other components include several kinds of freshwater ostracodes, gastropods, charophyte gyrogonites, and bone-like debris probably from fish.
Published in Proceedings of the Nebraska Academy of Sciences and Affiliated Societies, 87th Annual Meeting, April 15–16, 1977, pp. 40–41. Copyright © 1977 Robert F. Diffendal.