Figure 8. Over 100 glacial-marine deltas are scattered across the formerly submerged areas of Maine. Some of them are very large and among the most important sources of sand and gravel, as well as being major aquifers. This delta is located in Franklin (Stop 12). Its flat top approximates the position of sea level when the delta formed at the glacier margin. The ice sheet stood just to the north (left) of the area seen here. The hole in the foreground is a "kettle" that developed when buried ice remnants were engulfed by the growing delta. The ice blocks later melted and part of the delta surface collapsed into the depression. Photo by W. B. Thompson.
Last updated on July 24, 2007