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Igneous Structures and Field Relationships - Faculty web pages

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Figure 4-6. 4 a. Maar: : Hole-in<br />

in-the-Ground, Oregon (upper courtesy of<br />

USGS, lower my own). b. Tuff ring: : Diamond Head, Oahu, Hawaii<br />

(courtesy of Michael Garcia). c. Scoria cone, Surtsey, , Icel<strong>and</strong>, 1996<br />

(© courtesy Bob <strong>and</strong> Barbara Decker).<br />

a<br />

b<br />

c

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