SPATIAL EXTENT AND DISTRIBUTION OF GLACIAL ERRATIC MAPPING IN NORTHEASTERN KANSAS
This study maps Sioux Quartzite erratics across 13 sites in Pottawatomie, Wabaunsee, and Shawnee counties, Kansas. Erratics were deposited in two distinct patterns across sites, valley position (n=9) and hilltop position (n=4). At each site, measurements were taken from 20 different erratics (volume, GPS location, density). At valley sites, erratics were concentrated on one slope (mean= 117 erratics), with few rocks on high points or opposite slopes (mean= 16 erratics). Valley sites had rocks distributed along one side, which varied from site to site at similar elevations (mean= 351 m) with opposing erratics seen at a different elevation (mean= 348 m). At hilltop sites, erratics (mean= 84 erratics) were concentrated close to the highest elevation (mean= 373 m). Some erratics could be found along the slopes (mean=36 erratics) with a lower elevation (mean= 367 m). The rock sample size for valley sites (mean= 0.215 m3) was smaller than those for hilltop sites (mean= 1.76 m3). Although these results do not definitively identify patterns of erratic deposition, they may lead to a better understanding of how these erratics were deposited by the glacial ice, meltwater, icebergs, or modern erosion. This project’s future will include analysis of the erratics’ composition and the soil composition around the erratics.
Field Assistants: Wayne Walker, Courtney Ress, Kendra Baird, and Maggie Revell