How Susquehanna River Potholes Were Made, Video 2 скачать в хорошем качестве

How Susquehanna River Potholes Were Made, Video 2

The rock formations in this part of the Susquehanna River were the result of abrasive erosion by silt and sand rotated by a hydraulic vortex. As the sediment laden water swirled it began creating a depression and as the depression becomes deeper and larger rocks become part of the erosion process. (see other videos in this series for a larger view of this river section) This is a classic example where you have vertical erosion with a stone worn to an oval disk and a smaller stone in the pothole to increase the erosion process. I'm not a geologist and this is my layman's explanation. please refer to the experts. http://www.dcnr.state.pa.us/cs/groups... The larger potholes were formed by enormous flows of sediment laden water when the glacial ice dams farther north broke at the end of the last ice age.