The purpose of this study is to examine the palynoflora of the Eocene Sepulcher Formation from a previously unstudied location near Yancey Creek, in the northern part of Yellow stone National Park (see figure 1). This is a preliminary investigation that hopes to document the presence of fossil pollen and spores at this site. The long range goal of this project includes extensive sampling resulting in more detailed floristic, paleoecological and stratigraphic analysis then is presently known.

Five rock samples for palynological analysis were obtained during July, 2000 while the Eastern Illinois University Geology Field Camp was observing geological features in the park. Lithologically the samples are dark brown or gray lithic rich sandstones, siltsones and shales. One gray sandstone specimen contains unidentifiable fossil plant fragments.

Some of the samples have been processed using a density separation and standard acetolysis chemical treatment with microscope slides prepared using a glycerine jelly medium. Thus far, most of the slides have proven to be barren of pollen. However a few grains have been found and examination for statistically valid numbers of grains is continuing. Additional sample preparation is expected to lead to the discovery of enough palynomorphs to make preliminary scientific conclusions.

At this earliest stage of examination, a few grains of TCT (Taxodiaceae-Cupressaceae-Taxaceae), Juglans, and Quercus have been found. These findings are consistent with those of previous workers in other locations and fit well within the expected outcomes of the project. Details of this study will be posted on the Eastern Illinois University Geology Yellow stone National Park Research Program web site http://oldsci.eiu.edu/geology/camp/YNP/ynpres.htm

Figure 1. Map showing palynological sample location in Yellowstone National Park.