The Bible’s Flood account describes the greatest rain event ever recorded. Forty days and nights of rain falling on the earth (Genesis 7:12) would have caused immense denudation of landmasses around the globe. Evidence for this is provided by a key stratigraphic surface and by associated geochemical signatures.
Nature and extent of the ‘Great Unconformity’
The term ‘Great Unconformity’ was originally used to describe the prominent stratigraphic surface exposed in the Grand Canyon that separates the Lower Cambrian Tapeats Sandstone (of the Sauk cratonic sequence) from the underlying Precambrian strata (Granite Gorge Metamorphic Suite and tilted sedimentary rocks of the Grand Canyon Supergroup).
The Great Unconformity can be traced across North America and globally, including most of today’s southern hemisphere landmasses, along with Western Europe and Siberia—this makes it the “most widely recognised and distinctive stratigraphic surface in the rock record”.
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