FIGURE 8. Fryxell photo 315, showing Hueyatlaco ash overlain by Tetela brown mud 4 m higher at 1973 grid points 28V to 30F.
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FIGURE 8. Fryxell photo 315, showing Hueyatlaco ash overlain by Tetela brown mud 4 m higher at 1973 grid points 28V to 30F.
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