PART II.
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HYPERSTHENE-DACITES.
DISTRIBUTION AND DESCRIPTION
OF DACITE MASSES.
LLAO ROCK FLOW.
As far as may be judged from
the few specimens collected from this most conspicuous of the Crater Lake dacite
flows, the Llao Rock mass shows three quite distinct varieties of dacite—namely,
vitrophyric, lithoidal, and spherulitic dacite.
