biostratigraphy

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Stratigraphic position of the Olenellus fauna in North America and Europe
C. D. Walcott

American Journal of Science July 1889, s3-38 (223) 29-42; DOI: https://doi.org/10.2475/ajs.s3-38.223.29
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Note on the age of Swedish Paradoxides beds
S. W. Ford

American Journal of Science December 1886, s3-32 (192) 473-476; DOI: https://doi.org/10.2475/ajs.s3-32.192.473
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The genealogy and the age of the species in the southern old-Tertiary
O. Meyer

American Journal of Science December 1885, s3-30 (180) 421-434; DOI: https://doi.org/10.2475/ajs.s3-30.180.421
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Successional relations of the species in the French old-Tertiary
O. Meyer

American Journal of Science August 1885, s3-30 (176) 151-152; DOI: https://doi.org/10.2475/ajs.s3-30.176.151

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