The present contribution to our knowledge of the Kinderhook faunas differs from those which have preceded it in including material which has been collected from several distinct geographic localities. The Fern Glen formation was first described in connection with the discussion of the Glen Park section, in “Kinderhook Faunal Studies, IV.”2 It is a highly characteristic formation, consisting of beds of red calcareous shales which often graduate into red limestones. The lower limit of the formation is usually sharply defined, but toward its summit it passes gradually into greenish, shaly, calcareous beds, and these in turn merge gradually into the superjacent light colored, cherty Burlington limestone. The type locality of the formation is in the bluffs of the Meramec river, in the railroad cut just west of Fern Glen station, on the Missouri Pacific railroad, about 20 miles west of Saint Louis. At this locality the section exposed is . . .

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