Cyclothems of the Pennsylvanian Morgan Formation exposed in the canyon of the Yampa River, Dinosaur National Monument, Colorado. Alternating intervals of blue-gray limestone and orange cross-stratified sandstone record repeated glacio-eustatic sea level fluctuations. Photosets acquired from raft.
Roadcut of Pennsylvanian Hermosa Group strata exposed between Molas Pass and Engineer Pass along US 550, San Juan Mountains, Colorado. Amalgamated cross-bedded, lenticular arkosic sandstone bodies and fine-grained mudstone partings with complex bedding relationships.
Large roadcut of Late Cambrian Jordan Sandstone and overlying Ordovician Oneota Dolomite between Stockton and Lewiston, MN, illustrating low-angle bedding, intraclasts, and several scales of cross-stratification.