Looking for planar cross-bedding? Find out information about planar cross-bedding. Cross-bedding characterized by planar surfaces of erosion in the lower bounding surface Explanation of planar cross-bedding. I. Cross-bedding in which the lower bounding surfaces are planar surfaces of erosion. It results from beveling and subsequent deposition. Ref: AGI ii. Above threshold of movement on artificially smoothed bed unidirectional flow ripples are formed at relatively low flow strengths. Sections normal to flow may be horizontal, defining planar cross lamination (2-D ripples) or may be trough-shaped, defining trough cross lamination (3-D ripples).
A Few Definitions: 1) Stratification – layers in rocks; stratified rocks are those organized into beds See Grand Canyon Beds: Grand Canyon Beds. Planar Laminae are parallel to bedding, e.g. planar. See: trough cross stratification and other examples at: dune cross stratification See ripple cross lamination on Mars: martian ripples. Upon closer examination, however, you may see very fine layers (usually 1 to several mm thick) that are at an angle to the main bedding. These tilted layers contained within larger layers are termed cross bedding. Lecture Index: Definitions for and description of fabrics. Axial planar cleavage. bedding cleavage patterns. cleavage as a flattening plane, versus a slip surface.