Sedimentary rocks are the best place to find fossils. This is because sedimentary rocks are formed by the accumulation of sediments, such as mud, sand, and gravel, which contain organic matter that can become fossilized.

Here are some reasons why fossils are generally found in sedimentary rocks:

1. Sedimentary rocks are formed by the accumulation of sediments: Sediments are tiny particles of rocks, minerals, and organic matter that are carried by water, wind, or ice and deposited in a particular location. Over time, these sediments accumulate and become compacted and cemented together to form sedimentary rocks. Fossils can become trapped in these sediments and preserved over millions of years.

2. Sedimentary rocks are often formed in environments conducive to fossilization: Sedimentary rocks are often formed in environments such as rivers, lakes, oceans, and swamps where the conditions are conducive to fossilization. These environments provide a stable and protective environment for fossils to be preserved.

3. Sedimentary rocks are often softer and more easily eroded than other types of rocks: Sedimentary rocks are often softer and more easily eroded than other types of rocks, such as igneous and metamorphic rocks. This makes it easier for fossils to be exposed and discovered by paleontologists.

4. Fossils can provide clues about the environment in which they were formed: Fossils can provide valuable information about the environment in which they were formed, such as the type of vegetation, climate, and animal life that existed at the time. This information can help scientists better understand the history of the earth and the evolution of life on our planet.

In summary, sedimentary rocks are the best place to find fossils because they are formed by the accumulation of sediments, are often formed in environments conducive to fossilization, are often softer and more easily eroded than other types of rocks, and can provide valuable information about the history of the earth.