palynology, Quaternary, till stratigraphy
Erosion along Waterman Creek, O'Brien County, Iowa, has exposed two tills separated by a peat bed. The lower till is a pre-Illinoian till, based on lithological analyses, which crops out in the stream valleys and roadcuts along the Little Sioux River. It is also the same till which occurs at the surface west of Mill Creek in O'Brien County. Palynological analyses of the 38 cm thick peat bed indicate that a boreal forest containing abundant spruce and larch trees inhabited this area for a period of time before 40,000 RCYBP. This vegetation is similar to the late-glacial vegetation of northwestern Iowa, approximately 12,000 RCYBP.
Proceedings of the Iowa Academy of Science
© Copyright 1983 by the Iowa Academy of Science, Inc.
Van Zant, Kent L.
"Lithological and Palynological Analyses of a Quaternary Exposure, Waterman Creek, O'Brien County, Iowa,"
Proceedings of the Iowa Academy of Science: Vol. 90:
, Article 3.
Available at: http://scholarworks.uni.edu/pias/vol90/iss4/3