Rocks are broken apart, Small particles called sediment form. Compacted by weight from above And cemented by minerals dissolved in water start To form new — clastic sedimentary rock is born. Sandstone ...

Sedimentary rock is one of the three main rock groups (along with igneous and metamorphic rocks) and is formed in four main ways: by the deposition of the weathered remains of other rocks (known ...

Clastic sedimentary rocks are made from broken bits of older rocks that get packed together– like sandstone or shale. Chemical sedimentary rocks form when minerals in water settle and harden ...

A system of grain-size nomenclature of terrigenous sediments and sedimentary rocks is introduced wherein fifteen major textural groups are defined on the ratios of gravel, sand, silt, and clay.

The authors provide evidence for the existence of life on Earth in the earliest known sedimentary rocks and suggest that the presence of organic carbon, and low stable-isotope values of graphite ...