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Selection of the conodont Idiognathodus simulator (Ellison) as the event marker for the base of the global Gzhelian Stage (Upper Pennsylvanian, Carboniferous)
MICROCHEMICAL IDENTIFICATION AND DIFFERENTIATION OF AMARYLLIDACEAE ALKALOIDS PART II: TRISPHERIDINE, 6--ETHOXYBUPHANISINE, 6--ETHOXYCRININE, 3-O-ACETYLPOWELLINE, 3-O-ACETYLCRININE, CHERYLLINE, FLEXININE, BULBISINE AND AUGUSTISINE