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This pile of thin, inclined layers of sediment is a classic sign of cross-stratification - a rock feature sculpted by water moving in a turbulent flow.

Cross-stratification is one of those processes that is so well understood, you can use it to pull out some amazing information about the past environment in which it occurred.

Two of their colleagues on the work have some particularly nice web resources related to cross-stratification.

Cross-stratification from water currents, on the other hand, will likely show movement in assorted directions.

For anyone about to begin their study of geology, cross-stratification, or cross-bedding, will be one of the first topics to be covered in "sedimentary processes", and Shaler is a beautiful example.