SURFICIAL GEOLOGY OF THE WAVERLY QUADRANGLE, BREMER COUNTY IOWA
The Waverly Quadrangle lies in a terrain of dissected Pre-Illinoian glacial deposits that blanket a Paleozoic bedrock surface with significant relief. The study area also represents a portion of the Iowan Erosion Surface and exhibits Wisconsinan and Holocene alluvial surfaces, eolian landforms, and discontinuous outcrops of Paleozoic bedrock. Geologic units within the project area included Paleozoic carbonate bedrock, Pre-Illinoian glacial sediment and alluvium, Wisconsin outwash, loess, Holocene alluvium, and eolian sand. Some of the more important findings from the recent mapping of this quadrangle include: 1) lineated loess-capped, elongated elliptical ridges known as pahas, which are aligned in a northwest-southeast direction and 2) substantially shallow bedrock seen from GEOSAM data. GEOSAM is Iowa’s geologic site and sample cores tracking program.