What type of sedimentary rock involves the deposition of plant and animal remains?

Organic sedimentary rocks are formed from the accumulation and compaction of plant and animal remains over time. This type of rock typically includes materials such as coal, which is derived from ancient swamp vegetation, and limestone, which can form from the remains of marine organisms like coral and shells.

The formation processes of organic sedimentary rocks involve the burial of these biological materials, leading to lithification, where compacted layers become solid rock. This process is crucial for understanding the geological history of an area, as organic sedimentary rocks can reveal information about past environments and ecosystems.

In contrast, clastic sedimentary rocks are composed of fragments of pre-existing rocks and minerals, while chemical sedimentary rocks precipitate from mineral-rich water. Igneous rocks originate from the cooling and solidification of molten material (magma or lava) and are not related to sedimentary processes. Thus, the distinction of organic sedimentary rocks lies in their biological origins, making them a unique category within sedimentary geology.