Sedimentary rocks made from dead plants or animals compacted together are called organic sedimentary rocks.

Here are some examples:

* Coal: Formed from compacted and fossilized plant matter, primarily from ancient swamp forests.

* Oil shale: Contains organic matter like algae and plankton that can be extracted to produce oil.

* Limestone: Often forms from the accumulation of the shells and skeletons of marine organisms like corals, foraminifera, and mollusks.

These rocks are formed through a process called diagenesis, where organic matter is buried under sediment and undergoes chemical and physical changes over time.