Criteria for Recognit
Criteria for Recognit
Criteria for Recognit
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Caldera <strong>Recognit</strong>ion• Multiphase, sill-like, subvolcanic intrusion• Abrupt change in the thickness and orientation of units• Extensive, thick, pyroclastic/volcaniclastic deposits• Thick, ponded flow succession - low aspect ratio• Internal angular and erosional uncon<strong>for</strong>mities• Megabreccias - A product of collapse• Numerous dikes and sills – dike swarms (cone sheets)• Synvolcanic Faults – orthogonal, radial or concentric• Intense semicon<strong>for</strong>mable alteration
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