Siliciclastic Shelves Warmup

Your Name

Essay Question

Compare and contrast the deposits of a tide-dominated siliciclastic shelf with deposits of a wave-dominated clastic shelf.

Multiple Choice Question

Which one of the following vertical sequences is most likely to form on a transgressive storm-dominated shelf?

gravel lags overlain by large-scale cross bedding attributed to sand-wave migration and sand ribbons, overlain by bioturbated silts and muds

coarsening upward sequence of mud, cross-bedded sand, and gravel

burrowed shelf muds overlain by graded beds, overlain by hummocky cross-stratification, overlain by trough cross-bedding

fining upward sequence of TCS, HCS, graded beds, and burrowed muds

Ripples and ripple-bedding are common features of many sedimentary deposits. Unfortunately, it is not possible to distinguish between ripples that form from unidirectional or bi-directional currents and those that form by oscillatory motion associated with waves.

true

false