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Daniel Goldman, Charles E. Mitchell, Stig M. Bergstrom, John W. Delano, Steven Tice; K-bentonites and graptolites biostratigraphy in the Middle Ordovician of New York State and Quebec; a new chronostratigraphic model. PALAIOS 1994;; 9 (2): 124–143. doi: https://doi.org/10.2307/3515101
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