SOIL EVIDENCE FOR A GLACIATION INTERMEDIATE BETWEEN THE BULL LAKE ANDPINEDALE GLACIATIONS AT FREMONT LAKE, WIND RIVER RANGE, WYOMING, USA

Soils developed in glacial deposits in the Fremont Lake area of the Wi nd River Range of western Wyoming were investigated to provide a bette r basis for assessing the age and correlation of the deposits. Previou s investigators have identified two sets of moraines in the area, assi gning the older set to the Bull Lake glaciation and the younger set to the Pinedale glaciation. The Bull Lake is now commonly correlated wit h late Illinoian (marine-isotope stage 6) and the Pinedale with late W isconsin (stage 2) and perhaps the later part of middle Wisconsin (sta ge 3). However, the soils developed in the youngest moraine of the Bul l Lake set (moraine V) have characteristics such as soil morphology, c lay content, and calcium carbonate content and morphology that are int ermediate between those of the soils in the older Bull Lake moraines a nd those of the soils in the Pinedale moraines. We suggest that these soil characteristics reflect an intermediate age for this moraine, mos t Likely early Wisconsin, correlative with marine-isotope stage 4.