Clast Lithologies Of Late Wisconsinan Lodgement Till In The Cox Brook Drainage Basin, Central Vermont
Meegan Kelley (ES ’05)
A study of clast lithologies in glacial till was conducted along the northwest-southeast trending Cox Brook Road in Central Vermont that is crossed obliquely by the north-south trending contact between the Stowe (west) and Moretown (east) Formations ( Fig. 1).
figure 1
Data was collected by following the method used in the Great Pebble Campaign of F.D. Larsen, which included the excavation of 100 pebbles from lodgement till at selected sites along the Cox Brook Road. The selected pebbles are assumed to be representative of the total clasts in the till. The purpose of the study was to correlate the local bedrock and the clasts found in the till and to quantify the rate of change in clast proportions across geologic contacts. The percentages of clasts found are representative of the local bedrock and are traced along the ice flow direction of the Laurentide Glacier ( Fig. 2).
figure 2
It was found that the Stowe Formation rocks decrease inverse proportionally to the increase of the Moretown Formation rocks ( Fig 3.).
figure 3