Thus, any deformations of strata (Figures 2 and 3) must have occurred after the rock was deposited. The principle of superposition builds on the principle of original horizontality. The principle ...

It is believed that a 480 by 240 kilometer section of the underground mantle formed large-scale rock strata for a depth of 8 kilometers two billion years ago. Layers of solid bedrock at the ...

Not only was this scientifically significant, but in the process he produced something rather beautiful. Smith's colourful and sophisticated geological map was based on his astute observation that ...

According to a new study published in Proceedings of the National Academy of Sciences, an estimated five kilometers (3 miles) of rock strata were carved away by ancient glaciers during the planet ...