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The geologic record is like a big puzzle that (frankly) is really fun to sort out, especially if you are a little OCD and like things to be in order (not that I’d know anything about that…).Perhaps the biggest impediment to a neat and orderly rock record are our old friends weathering and erosion.Recall that most fossils are housed within sedimentary rock, which results from the compaction and cementation of deposited sediments.A principle of geology, called the states that in a series of undisturbed layers, any layer was deposited after the layers below it (that is, it’s younger than those layers) and before the layers above it (that is, it’s older than those layers).Steno made careful geologic observations and illustrations.He published the results of his work and established a basic set of principles for interpreting sedimentary strata.Geologists still use Steno's principles, with some refinements and additions.They are summarized as the Principles of Relative Geologic Age Determination, sometimes referred to as the Principles of Relative Dating.

What happened in the intervening 1.2 billion years? We just don’t, at the Grand Canyon, have a record of it.

They get uplifted, tilted, faulted, squashed and squeezed, and magma gets injected into them.

It’s all a bit of a mess—but a mess that can be put in chronological order using relative dating principles.

In either case, weathering and erosion are left free to work their mischief and erase some evidence of the geologic past. We’ll never know what happened during those 1.2 billion years? The Grand Canyon is not the only location with a rock record.

Scientists can correlate rock layers in different locations to get a more complete geologic record.