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According to the paper, 1.66 billion years ago a chasm grew between the Georgetown Inlier and Laurentia.

Lead author Adam Nordsvan from Curtin University explains to IFL Science that the Inlier of Georgetown is like a “continental ribbon” described as a “piece of continental crust that has rifted from a craton,” in this case Laurentia.

A new geological study led by researchers from Curtin University in Western Australia has determined that rocks beneath the town of Georgetown, North Queensland—commonly known as the Georgetown Inlier—were once a part of Canada’s Western Laurentia, the geological core of North America.

The Cornbrash is exposed along part of the Billing brook, and in a small inlier near Yaxley.

Silurian rocks, the oldest in the county, form a small inlier about 2 sq. m. in area at Rumney and Pen-y-lan, north of Cardiff, and consist of mudstones and sandstones of Wenlock and Ludlow age; a feeble representative of the Wenlock Limestone also is present.