Diatom populations in two cores of lake sediments from Northwest Iowa have been analyzed as part of an investigation into the history of postglacial sediments in this region. The three member strata sequence of sediments indicate lacustrine diatoms were deposited in the upper two members. Diatoms and macroscopic organisms are scarce to non-existent in the deepest member. Evidence indicates that the level where diatom populations were first established represents the original bottom of the lake. Pollens, particularly spruce pollen, found immediately below the upper two members were possibly blown in and mixed with sediments from the receding glacier.
Proceedings of the Iowa Academy of Science
©1972 Iowa Academy of Science, Inc.
Hungerford, James J.
"Some Diatoms in Lacustrine Sediments of Pillsbury and Sylvan Lake Beds in Northwest Iowa,"
Proceedings of the Iowa Academy of Science, 78(3-4), 57-62.
Available at: https://scholarworks.uni.edu/pias/vol78/iss3/8