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Sediment plays a crucial role in the formation of fossils primarily by helping to preserve the remains of organisms. When an organism dies, the soft tissues decompose, but if the remains are quickly buried by sediment, such as mud, sand, or silt, they are shielded from environmental factors that would normally lead to decay. This sediment acts as a protective layer, preventing scavengers, bacteria, and the elements from affecting the remains. Over time, the pressure from the accumulating layers of sediment can lead to the hardening of these remains into fossilized forms, allowing for the preservation of the organism's shape and structure. This process is essential in creating the fossil record that helps scientists understand past life on Earth.