Fox Hills Formation

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Some suggestions upon the methods of grouping the formations of the middle Cretaceous and the employment of an additional term in its nomenclature
George Homans Eldridge

American Journal of Science October 1889, s3-38 (226) 313-321; DOI: https://doi.org/10.2475/ajs.s3-38.226.313
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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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