The type of rocks that contain fossils are formed when grains accumulate at the bottom of bodies of water; they are called _______ rocks, and they can be dated relative to each other by a method called stratigraphy.

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Sedimentary rocks are formed from the accumulation of sediments, including fossils, at the bottom of bodies of water. They can be dated relative to each other through stratigraphy, which involves analyzing the layers (strata) of the rock and the fossils contained within them. Igneous and deep rocks are not likely to contain fossils, and stromatolite and tertiary are specific types of sedimentary and time periods, respectively, but do not fully encompass the answer.

The Type of Rocks That Contain Fossils Are Formed When