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Music Mt. (con't) White. Much [[underline]] Girvanella [[/underline]] occurs here. It is a little larger than is usual for the M. [[strikethrough]] C [[/strikethrough]]. type, but otherwise quite similar. Trilobite fragments (unidentifiable) occur in the lower Muav as in the sandy layers of the underlying Bright Angel Devonian follows. [Dr. Stoyanow has measured section]