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Igneous Structures and Field Relationships - Faculty web pages

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<strong>Structures</strong> <strong>and</strong> <strong>Field</strong><br />

<strong>Relationships</strong><br />

Figure 4-194<br />

19. Section through a typical ignimbrite,<br />

showing basal surge deposit, middle flow, <strong>and</strong><br />

upper ash fall cover. Tan blocks represent<br />

pumice, <strong>and</strong> purple represents denser lithic<br />

fragments. After Sparks et al. (1973) Geology, 1,<br />

115-118. 118. Geol. Soc. America

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