George D. Brown, Robert L. Anstey; Lexington Limestone-Kope Formation contact (Ordovician) in southeastern Indiana. AAPG Bulletin ; 52 (3): 488–493. doi:
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The contact between the Lexington Limestone and Kope Formation is placed at the change in limestone lithologic types. Below the contact biosparrudite and biosparite are common; above they are absent.
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