intrusion dike realative dating

Principle of Original Horizontality Sedimentary strata are deposited in layers that are horizontal or nearly horizontal, parallel to or nearly parallel to the Earth's surface. The pieces of shale were eroded as the sand was deposited, so the shale is older than the sandstone. There are three types of unconformities, nonconformity, disconformity, and angular unconformity. This is known as the Great Unconformity and is an example of an angular unconformity. Both the dike and the lower strata are cut by an unconformity. In location A we have rock layers that successively have different types and combinations assemblages of fossils. Figure 8.

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