My father was a geologist. When Interstate 75 was being built through Kentucky, a lot of hills had to be cut through, and Dad would often stop and take a look at the layers of earth and rock those cuts exposed, including layers that aren’t horizontal due to tectonic uplift. I don’t know if everyone else is as familiar with rock layers and geologic time as I was as a child, but most of us understand the concept somewhat.
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At Siccar Point in Scotland, the layers are completely different. In the area called Hutton’s Unconformity, the older layers are on their side, while others just above are horizontal. This changed the science of geology in 1788, when James Hutton studied these layers. Tom Scott takes us there and explains.