Nearly all fossils occur in what kind of rock?

Nearly all fossils occur in sedimentary rock. This type of rock forms from the accumulation and compression of sediments, which can include organic materials, allowing for the preservation of organisms over time. The environments where sedimentary rocks are formed, such as riverbeds, lakes, and oceans, are conducive to fossilization. In contrast, igneous and metamorphic rocks are typically not associated with fossils due to their formation processes.