Detail of the boulder breccia (basal layer of Cambrian) transitioning into overlying Sauk Sea sandstone at East Bluff, Devil's Lake State Park in Wisconsin. ⚒️
A BILLION YEARS OF MISSING TIME The Great Unconformity at East Bluff, Devil's Lake, Wisconsin: 1.63 Ga Baraboo Quartzite overlain by a boulder breccia at the base of the sandstones of the Cambrian Sauk Sea (600-505 Ma). ⚒️