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Hanson Formation
The Hanson Formation is one of only two major dinosaur-bearing rock formations found on the continent of Antarctica to date; the other is the Santa Marta Formation from the Late Cretaceous. The formation has yielded only a handful of Mesozoic specimens so far and most of it is as yet unexcavated. Part of the Victoria Group of the Transantarctic Mountains, it is below the Prebble Formation and above the Falla Formation.〔Elliot, D.H. (1996). ''The Hanson Formation: a new stratigraphical unit in the Transantarctic Mountains, Antarctica.'' Antarctic Science 8(4):389-394.()〕
== Fauna ==
The first dinosaur to be discovered from the Hanson Formation was the predator ''Cryolophosaurus'' in 1991, which was then formally described in 1994. Alongside these dinosaur remains were fossilized trees, suggesting that plant matter had once grown on Antarctica's surface before it drifted southward. Other finds from the formation include tritylodonts, herbivorous mammal-like reptiles and crow-sized pterosaurs. Surprisingly were the discovery of prosauropod remains, which were found commonly on other continents only until the Early Jurassic. However, the bone fragments found at the Hanson Formation were dated until the Middle Jurassic, millions of years later. In 2004, paleontologists discovered partial remains of a large sauropod dinosaur that has not formally been described yet.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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