The Giron beds of Colombia are a sparsely fossiliferous series of continental clastic deposits which have been regarded as late Triassic or younger. Fern leaves referred to Callipteridium and ostracods of the genus Darwinula, indicative of Permo-Carboniferous age, have recently been identified in carbonaceous shale in the lower part of the series in the Lebrija valley, Santander.

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