Cockerell

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On critical periods in the history of the earth and their relation to evolution; and on the Quaternary as such a period
Joseph Le Conte

American Journal of Science August 1877, s3-14 (80) 99-114; DOI: https://doi.org/10.2475/ajs.s3-14.80.99
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On the bearing of Devonian botany on questions as to the origin and extinction of species
John William Dawson

American Journal of Science December 1871, s3-2 (12) 410-416; DOI: https://doi.org/10.2475/ajs.s3-2.12.410

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