Mount Achernar (84°12′S 160°56′E / 84.200°S 160.933°E) is a peak forming the northeast end of the MacAlpine Hills, on the south side of Law Glacier. Named by the New Zealand Geological Survey Antarctic Expedition (NZGSAE) (1961–62) after the star Achernar used in fixing the survey baseline.Antacrtica[1][2]
Late Permian buried forest
editMount Achernar consists of the deeply eroded and glacially sculptured beds of sandstone, siltstone, shale, and coal of the Buckley Formation of the Beacon Supergroup. Exposed by the slopes of this mountain is a well known and studied late Permian buried forest consisting of numerous in situ fossil tree stumps. These silicified stumps are up to 18 cm (7.1 in) and 20 cm (7.9 in) height and in growth position. The tree rings on these stumps are well-preserved and exhibit narrow zones of latewood that represent a young, rapidly growing forest at latitudes of about 80° to 85 °S. These trees are interpreted to represent a forest growing at the time that the climate was warm because of the wide growth rings, lack of frost rings, and the deciduous nature of Glossopteris.[3][4][5]
Go see
editGordon Valley buried forest
References
edit- ^ "Mount Achernar". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved 2023-08-06.
- ^ Stewart, J., 2011. Antarctica: An Encyclopedia, 2nd ed. Jefferson, North Carolina and London, McFarland & Company, Inc. 1771 pp. ISBN 978-0-7864-3590-6
- ^ Cúneo, N.R., Isbell, J., Taylor, E.L. and Taylor, T.N., 1993. The Glossopteris flora from Antarctica: taphonomy and paleoecology. Comptes Rendus XII ICC-P, 2, pp.13-40.
- ^ Taylor, E.L., Taylor, T.N. and Cúneo, N.R., 1992. The present is not the key to the past: a polar forest from the Permian of Antarctica. Science, 257(5077), pp.1675-1677.
- ^ Ryberg, P.E., Taylor, E.L. and Taylor, T.N., 2012. Antarctic glossopterid diversity on a local scale: the presence of multiple megasporophyll genera, Upper Permian, Mt. Achernar, Transantarctic Mountains, Antarctica. American Journal of Botany, 99(9), pp.1531-1540.
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