Graded Beds Sample Plans PDF

graded beds 1

Graded beds form when a steep pile of sediment on the sea floor (or lake floor) suddenly slumps into a canyon or off a steep edge. As the sediment falls, water mixes in with it, creating a slurry of sediment and water that flows quickly down a sloping bottom. GRADED BEDDING means that the grain size within a bed decreases upwards. This type of bedding is commonly associated with so called turbidity currents. Sedimentary structures such as cross-beds, graded beds, and mud cracks are useful for determining which way was up in the original sequence of sediments.

graded beds 2REVERSED, or inverted, graded bedding, although recorded by several.

Geological Magazine

graded beds 3

Graded Bedding