Mason, J.F., 1936, [Pioche and Highland Ranges, Nevada]: Peking National University Press, p. 274-276., 2nd edition
[Written commun. from John F. Mason, Princeton Univ., Oct. 6, 1935, on his latest studies in the Pioche and Highland Range region, Nevada]. Comet shale. Predominantly shaly beds 545 feet thick. Underlies Lyndon limestone; overlies Forlorn Hope shale (new). Pioche shale of Walcott (1908), and Westgate and Knopf (1927) includes Comet shale, Forlorn Hope shale, and Pioche shale as used here. Fossils (trilobites, mollusks). Age is Middle Cambrian [based on fossils].
Source: US geologic names lexicon (USGS Bull. 1200, p. 903).
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