Bedrock jointing and geomorphology in southwestern Ontario, Canada: an example of tectonic predesign

In southwestern Ontario, Canada, Palaeozoic sedimentary strata are covered by Pleistocene glacial sediments. The topography of the buried bedrock surface has been mapped over an area of some 45,000 km2 using new computerised depth-to-bedrock data from more than 200,000 waterwells. This information shows that arching of the underlying Proterozoic basement (Canadian Shield) and differential erosion of carbonate and shale strata are first-order, …