Well-Preserved Fruiting Body of Dicroidium Seed Fern Fossil

Umkomasia sp.

Geological Time: Triassic

Size (25.4 mm = 1 inch): 11 mm by 9 mm on a 38 mm X 50 mm matrix

Fossil Site: Merrywood Coal Mine, Royal Gorge, Tasmania, Australia

Code: AFF19

Price: $25.00

DicroidiumDescription: Corystosperms or fork-leafed seed ferns are a group of extinct plants with mostly fern-like foliage but with real seeds found in the Southern Hemisphere lands of Gondwana. The flora of Gondwana evolved in isolation from the rest of Pangaea because of an arid desert that persisted near the equator. The seed fern Dicroidium, like Glossopteris was found throughout Gondwana, and helped lend credence to the theory of Continental Drift. They possessed elaborate reproductive structures which had their known nomenclature. The female reproductive structures were of the Umkomasia type, while the male pollen-bearing structures were termed Pteruchus. They serve as important index fossils, and some data indicates that they may heave persisted into the Cretaceous when the angiosperms first made their appearance. Few are ever listed for sale—Triassic plants are rarely available, making this a desirable specimen offered at a most affordable price.

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