Medical Definition of amnesia. 1: loss of memory sometimes including the memory of personal identity due to brain injury, shock, fatigue, repression, or illness or sometimes induced by anesthesia a period of amnesia after the wreck.
Shale is a fine-grained sedimentary rock that forms from the compaction of silt and clay-size mineral particles that we commonly call mud. This composition places shale in a category of sedimentary rocks known as mudstones.
TWO TYPES OF SEDIMENTARY ROCKS. 1  DETRITAL SEDIMENTARY ROCKS-rocks that form from transported solid material. 2  Detritus-Latin for worn down.. 3  Solid rock fragments in sediment are defined by size of the fragments: largest to smallest: BOULDERS, COBBLES, PEBBLES, SAND, SILT, and CLAY. DETRITAL SEDIMENTARY ROCKS-rocks that form from transported solid material. 2  Detritus-Latin for worn down.. 3  Solid rock fragments in sediment are defined by size of the fragments: largest to smallest: BOULDERS, COBBLES, PEBBLES, SAND, SILT, and CLAY.