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Most sedimentary rocks are laid down in flat, horizontal layers.It settles out of the air and forms a layer over wide regions at the same time. The remians of the impact site in Mexico as seen by satellite imagery.Example: the layer that marks the extinction of dinosaurs has characteristics of an asteroid impact.They tilted a little then eroded to make the straight cutoff (the diagonal line going from bottom left to top right).Then the final deposit was the layers to the top left.
Resources in this section pertain to the formation and evolution of the Earth and how it has been discovered through the relative and absolute dating of rocks and fossils.