(a) Why are cross-beds (Fig. 5.4) very important sedimentary structures?
Answer to relevant QuestionsWhat type of bed is illustrated in Fig. 5.5(a)?Contrast the histories of a well-rounded, well-sorted quartz sandstone [Fig. 5.8(a)] and a poorly sorted graywacke with angular grains of various compositions [Fig. 5.8(d)].Two limestones are shown in microscopic views in Fig. 5.9. Contrast their histories.If a body of seawater is totally evaporated, what sequence of rock types results?Do ripple marks preserved in a sedimentary rock indicate deposition in shallow water?
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