Produced by Currents Bedforms are structures that are moulded on beds where deposition is taking place. Current-produced bedforms are diverse, and are useful indicators of depositional processes. Most bedforms migrate over the sediment surface. As a result, sediments deposited by bedforms typically show cross-stratification. The selection shown here includes both views of bedforms, and views of cross-stratification in strata deposited in bedforms.
Faster currents produce dunes.
Dunes produce cross-bedding in deposited sediment. This is a trough cross-bed, characteristic of deposition in lunate dunes. Flow is from left to right, but antidunes were visibly migrating slowly from right to left.