A detailed measured section and sequence stratigraphic interpretation of the Pennsylvanian (Moscovian) Hermosa Formation on Sandstone Mountain near Rico Colorado, reveals 19 unconformity-bounded sequences, nested within 3-5 sequence sets. Measuring 286 m thick, the section provides the closest surface location to examine the updip facies equivalent to the prodeltaic shales that host recent shale gas plays in the adjacent basin. Here we present a...