The older fossils are typically found in the lower layers of sedimentary rocks. These lower layers, known as stratigraphic units, were deposited first and have accumulated over longer periods of time. As new layers of sediment are added on top, the older layers become buried deeper, resulting in the older fossils being found in lower sedimentary strata.
Fossils are the preserved remains or traces of ancient organisms. They are commonly found in sedimentary rocks, which are formed through the accumulation and consolidation of sediments. Sedimentary rocks are typically deposited in horizontal layers, with each layer representing a distinct period of time.
The principle of superposition in geology states that in undisturbed sequences of sedimentary rocks, the oldest rocks are found at the bottom, and the youngest rocks are found at the top. This principle allows scientists to determine the relative ages of different rock layers and the fossils contained within them.
When organisms die, their remains can become buried by sediment over time. As more sediment accumulates, it puts pressure on the underlying layers, causing them to harden into rock. The process of fossilization occurs when the organic remains are preserved within these sedimentary layers.
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