Ontario's Provincial Plaques

Here's where you can learn a little Ontario history.

Ripple Rock

Photo by John Carman Shultis - July 6, 2006

Photo by Ron Schott - July 20, 2002

Plaque Location

The District of Algoma
The Township of Johnson
Near the rock outcropping, Highway 17, about 2.5 km west of Desbarats and 4 km east of Highway 548

Plaque Text

The ripple marks on the adjacent rock face 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 degrees 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 of of the current.

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Landforms

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