Here's the answer:
While fossils can be found in various sedimentary rocks, they are most commonly found in:
* Limestone: Formed from the accumulation of marine organisms' shells and skeletons.
* Sandstone: Formed from sand grains, which can contain the remains of ancient organisms.
* Shale: Formed from compacted clay and silt, which can preserve delicate fossils.
It's important to note that not all sedimentary rocks contain fossils.
For example, rock salt and evaporites are formed from the evaporation of water and generally don't contain fossils.
The key factors determining the presence of fossils in sedimentary rocks are:
* Type of organism: Hard-shelled organisms are more likely to be preserved than soft-bodied ones.
* Depositional environment: Environments with rapid burial and low oxygen levels are ideal for fossil preservation.
* Geological processes: Rocks can be eroded, metamorphosed, or deformed, which can destroy fossils.
Let me know if you have any other questions!
