马萨诸塞州
冰川坑洞/Glacial Potholes
The "Glacial Potholes" began to form after the last glacier age when the Deerfield River first started to flow over these rocks, about 14,000 years ago. The formation of these river-eroded features thanks to the great glacial lake, Lake Hitchcock, that filled the Connecticut Valley and also extended into the lower Deerfield Valley. While Shelburne Falls was not under Lake Hitchcock, it was under the sediments of the Deerfield River that built a delta into the lake.
1年前