TABLE 2. CORRELATION OF COMPOSITE SECTIONS 
The terms "dust,” "sand,” "gravel,” and "rubble” refer to beds of crystal and lithic fragments, graded somewhat as to size of particle; the terms "ash,’ 
shard,” and "pumice” refer to beds of primary vitric fragments, graded similarly as to size. "Piso” denotes pisolitic structure of the fine materials, "ass’ 
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