The photo above shows an impressive view of the appropriately named Green River (both top and center) at Steamboat Rock in Echo Park Utah/Colorado. It was taken from Harpers Corner near the Dinosaur National Monument. A short distance below Echo Park, the Green River loops around Steamboat Rock, crosses the Mitten Park fault, and empties into Whirlpool Canyon, a huge gorge spanning 1.5 miles (2.4 km) – it’s approximately 2,500 feet (762 m) deep. The canyon formed by the Green River, near the confluence with the Yampa River, is eroded primarily from Mississippian and Pennsylvanian strata. In the upper canyon walls, massive Mississippian and Pennsylvanian limestone beds form huge stairsteps of nearly vertical cliffs and steeply sloping ledges. Cambrian age rocks are exposed closer to the bottom of the canyon bottom. Photo taken in the spring of 2010.