Harris Ledge [SEP] continent
Harris Ledge
Harris Ledge () is a flat, ice-free ridge to the north of Mount Hercules in the Olympus Range of Victoria Land, Antarctica. It was named by the Advisory Committee on Antarctic Names in 1997 after Henry Harris of the Illinois State Geological Survey, who made hydrogeological studies with Keros Cartwright (after whom Cartwright Valley is named) in Victoria Valley, Wright Valley, and Taylor Valley during the Dry Valley Drilling Project in the 1973–74, 1974–75, and 1975–76 seasons.
Cascade subcontinent that docked with Washington about 50 million years ago as the entire continent of North America moved west across the ocean. The Alps were heavily eroded by glaciers in the last ice age. The Vashon lobe of the ice sculpted Rattlesnake Ledge, steeply carved the east and west sides of Squak Mountain, and deposited a large erratic on Cougar Mountain, Fantastic Erratic.
Cedar Butte rises abruptly from the moraine between Rattlesnake Ledge and the absolute front of the Cascades. It is sometimes considered part of the Issaquah Alps but it