. Bulletins of American paleontology. 270 Bulletin 361 Russell Bank Core 19B Mg/Ca (avg) Sr/Ca (avg) Na/Ca (avg). Park Key Core 23A Mg/Ca (avg) 15 20 25 30 35 40 45 50. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Paleontological Research Institution (Ithaca, N. Y. ); Columbia University. Ithaca, N. Y. , Paleontological Research Institution [etc. ]

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