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The McCauley Sinks, in the Holbrook basin of northeastern Arizona, are comprised of some 50 individual sinkholes within a 3-km-wide depression. The sinks are grouped in a semi-concentric pattern of three nested rings. The outerring is an apparent tension zone containing ring fractures. The two innerrings are semi-circular chains of large sinkholes, ranging up to 100m across and 50m deep. Severalsub-basins...
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