Ontario's Historical Plaques 

Discover Ontario's history as told through its plaques

2004 - Now in our 14th Year - 2018

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"Ripple Rock"

Ripple Rock

Photo by contributor John Carman Shultis - Posted July, 2006

Ripple Rock

Photo from Google Street View ©2011 Google - Posted March, 2011

Ripple Rock

Photo by contributor Ron Schott - July, 2002

Plaque Location

The District of Algoma
The Township of Johnson
Near the rock outcropping on the north side of Highway 17
between Sault Ste. Marie and Bruce Mines
about 4.2 km east of Highway 548
(the road to St. Joseph Island)

Coordinates: N 46 20.265 W 83 57.323


Click here for a larger map

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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