Ontario's Historical Plaques

at ontarioplaques.com

Learn a little Ontario history as told through its plaques

Red Rock

I have visited the location shown below but have been unable to locate this plaque there.

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(see location below) and emails it to me (see menu above),
I will post it here and give that person credit as the photographer.

Plaque Location

The District of Thunder Bay
The Township of Red Rock
On Highway 11/17, west of Nipigon between Highways 585 and 628


Coordinates: (unknown)

Plaque Text

One of Ontario's most striking geological formations, this cuesta has at its base granite rocks formed deep in the Earth some 2,500,000,000 years ago and exposed after millions of years of erosion. Subsequently a thick deposit of sediment accumulated, possibly in the waters of an inland sea that once covered this region. The sediment was converted by pressure into layers of shale, impure limestone and sandstone, red in colour owing to the presence of iron-bearing hematite. A molten material, diabase, later forced its way horizontally between the sediments forming a 'sill' which was uncovered by subsequent erosion. This is the dark rock capping the hill. Its columnar structure was produced by shrinkage during the cooling process.

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Posted November 1, 2011
We used to see this plaque about 5 miles West of Nipigon on the north side of the road. But the last time we drove from Nipigon to Thunder Bay we didnt spot it.

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