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The Denver Tertiary formation
Charles Whitman Cross

American Journal of Science April 1889, s3-37 (220) 261-282; DOI: https://doi.org/10.2475/ajs.s3-37.220.261
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Note on the Fox Hills group of Colorado
John J. Stevenson

American Journal of Science May 1879, s3-17 (101) 369-373; DOI: https://doi.org/10.2475/ajs.s3-17.101.369
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Note on the age of the Laramie group or Rocky Mountain lignitic formation
Henry Martyn Bannister

American Journal of Science March 1879, s3-17 (99) 243-245; DOI: https://doi.org/10.2475/ajs.s3-17.99.243
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Notes on the geology of Kansas
Ferdinand Vandiveer Hayden

American Journal of Science July 1867, s2-44 (130) 32-40; DOI: https://doi.org/10.2475/ajs.s2-44.130.32
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Notes on chalk and Cretaceous deposits in eastern Colorado
D. C. Collier

American Journal of Science May 1866, s2-41 (123) 401-403; DOI: https://doi.org/10.2475/ajs.s2-41.123.401
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Remarks on the Carboniferous and Cretaceous rocks of eastern Kansas and Nebraska
Fielding Bradford Meek

American Journal of Science March 1865, s2-39 (116) 157-174; DOI: https://doi.org/10.2475/ajs.s2-39.116.157

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