That fossil species may have been dated somewhere else, so you can match them and say that your fossil has a similar age. Plate Tectonics. To unlock this lesson you must be a Study. If sufficient sedimentary material is available, it will be deposited up to the limits of the sedimentary basin. If it had happened before the layers had formed, then we wouldn't see it punching through all the layers; we would only see it going through the layers that had existed at the time that it happened.
Unlike the principles of superposition and crosscutting, faunal succession is a secondary principle.