Figure 2. This photo shows the very coarse texture of the ice-marginal deposit, indicative of a nearby source. The photo also shows an exposure of the topset/foreset contact characteristic of deltas. The flat-lying beds at the top of the delta (topsets) are fluvial deposits, similar to those found in modern glacial streams. The beds below (foresets) which are dipping to the right (southerly) are typical of deposits found at glacial lake deltas. The sediment brought to the lake by streams is deposited at the delta and cascades down the delta front slope, represented in the photo by the dipping foreset beds. The contact between the overlying horizontal topsets and underlying dipping foresets is the approximate former lake surface elevation.
Last updated on October 6, 2005