Abstract
IN several recently-published papers,1 Prof. George P Merrill has called attention to some interesting deposits which are shown by careful microscopic study to consist of volcanic dust.
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References
"On Volcanic Dust from South-Eastern Nebraska" (Proc. Nat. Mus-vol. vii. 1885, p. 99; "Notes on the Composition of Certain Pliocene Sandstones from Montana and Idaho" (Am. Journ. Sci. vol. xxxii. 1886, p. 199).
Water given off at 105° C.
Science, July 24, 1885.
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Deposits of Volcanic Dust . Nature 35, 174–175 (1886). https://doi.org/10.1038/035174a0
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DOI: https://doi.org/10.1038/035174a0