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9 <br />Fig. 1. The Weber Sandstone dominates the Yampa Canyon below Big Joe Rapids. <br />As seen here at Harding Hole (Mile 20.3) the canyon is often wide with a <br />broad floodplain within this geologic unit. <br />Fig. 2. The Upper Morgan Formation as it appears near Happy Hollow (Mile 44) <br />forms a narrow canyon with ledgy cliff walls and steep talus slopes extending <br />directly to the river. <br />