Coring, Storing, and SamplingCoring
To study sequences (series) of fossil pollen, scientists obtain samples, or cores, of sediment from lakes or peatlands. Cores are typically taken in one-meter (about 3 ft.) sections, and sediment may be sampled to a depth of twenty meters or more.
Lakes in the Midwest typically have ten to twenty meters of sediment. To take the cores, palynologists lower a coring device from a well-anchored raft or, in the winter, from the frozen lake surface.