摘要: During a seismic survey in Big Horn County, Montana, number of deep reflections from 7.0 to 8.5 seconds were observed. The reflecting surfaces are relatively flat as shown by the small step‐outs. It is demonstrated that these cannot be multiples and they therefore must come inside basement at depth 18 21 km. nature determined available data, but it pointed out fall range generally stated for granitic layer.
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