Geology of a CLASSIC incised valley fill (Pine Ridge Sandstone, WY)

Incised valleys form when rivers cut down into older deposits or bedrock and then get “trapped” there. Falling sea level, tectonic uplift, or climatic changes can all lead to valley incision. The Pine Ridge Sandstone is a Late Cretaceous (74-73 Ma) incised valley fill deposit dominated by tidally influenced fluvial deposits. There are dinosaur tracks commingled with marine trace fossils, suggesting the valley formed an estuary. It cuts into the shoreface deposits of the Rockies River Formation and there is a biostratigraphic gap of 600,000 to 1 million years between them. Come along on this virtual field trip to explore the geology of this well-exposed and well-documented valley fill and learn more about this classic outcrop!

Видео Geology of a CLASSIC incised valley fill (Pine Ridge Sandstone, WY) канала Dr. Anton's Rock-o-Rama