This is a great website at the USGS that has graphics to help visualize how cross-bedding and bedforms develop (based on Rubin, D.M., and Carter, C.L., 2006, Bedforms and Cross-Bedding in Animation: SEPM Atlas Series No. 2).
Guide to Stratigraphy with definitions, usage, lithostratigraphy, biostratigraphy, sequence stratigraphy and more by the International Commission on Stratigraphy.