06/16/2026
Sedimentary Rocks
Sedimentary rocks are formed by the deposition, compaction, and cementation of sediments such as sand, mud, gravel, and organic remains.
OR
Sedimentary rocks are formed by the accumulation, compaction, and cementation of sediments or by chemical and organic processes."
Main Characteristics:
•Usually occur in layers (strata).
•Often contain fossils.
•Form at or near the Earth's surface.
•Cover about 75% of the Earth's land surface.
Types:
•Clastic Sedimentary Rocks : formed from rock fragments.
Example: Sandstone, Shale
•Chemical Sedimentary Rocks : formed by precipitation of minerals from water.
Example: Rock Salt
•Organic Sedimentary Rocks : formed from plant and animal remains.
Example: Coal
Examples:
•Limestone
•Sandstone
•Shale
•Conglomerate
