Ripple Rock

The ripple marks on the adjacent rock faces were made some two billion years ago by waves in a shallow body of water. Buried by later deposition of silt and then subjected to great pressure, the rippled sand became sandstone. The formation was subsequently tilted 60" from the horizontal by crumpling of the earth's crust. This exceptional feature is of particular interest in that there are at least three distinct beds of sandstone, two of them with ripple-marks oriented almost at right angles to each other. This implies an abrupt change in the direction either of the shoreline or of the current.


Near the rock outcropping, Highway 17, about 2.5 km west of Desbarats and 4 km east of Highway 548

Region: Northern Ontario

County/District: District of Algoma

Municipality: Township of Johnson