Ripple marks are primary sedimentary structures and mud cracks begin at the ground surface and propagate downward, right? Detailed analyses of fracture surface morphology described by Bahat, Rabinovitch, and Frid in Tensile Fracturing in Rocks will convince the serious graduate student and dedicated professional that ripple marks exist on fracture surfaces as undulations and arrest marks, and mud-crack initiation points often are located along or near the base of the desiccated sediment, where potential flaws are more abundant because of natural fining-upward sorting of grains. Fractography is defined as that branch of science that analyzes fracture surface morphology and related...

First Page Preview

First page PDF preview
You do not currently have access to this article.