Sedimentary fossils are remains or traces of ancient life that are preserved in sedimentary rock. These fossils form when organisms, such as plants and animals, are buried by layers of sediment. Over time, the pressure from these layers compresses the organic material, allowing it to become fossilized. The process of fossilization often involves minerals replacing the original organic material, creating a rock-like structure. Common types of sedimentary fossils include shells, bones, and imprints of leaves. These fossils provide valuable information about past environments and the evolution of life on Earth.