Red Rock

Photograph not yet taken.

If anyone takes a clear close-up digital photo of this plaque
(see location below) and emails it to me (see menu above for address),
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
Near the cuesta, Highway 11/17, just west of Red Rock

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 molton 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.