The Golconda group is overlain by the Hardinsburg formation and underlain by the Cypress formation in Illinois and western Kentucky but by the Elwren formation in Indiana and N.-central Kentucky. The 3 units of the Golconda group, the Beech Creek formation, Fraileys and correlative Big Clifty formations, and the Haney formation, in ascending order, are readily distinguishable on the basis of their respective conodont faunas. Gnathodus is the dominant genus in the Beech Creek whereas Cavusgnathus dominates the Haney fauna. The fauna of the Beech Creek represents an invasion from a southern faunal province of Texas and Oklahoma, and the Haney fauna is characteristic of the Illinois basin faunal province.

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