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The Mawson Formation is a geological formation in Antarctica, dating to roughly between 185-181 million years ago and covering the Pliensbachian-Toarcian stages of the Jurassic Period in the Mesozoic Era. Vertebrate remains are known from the formation. The Formation represents an ancient lake, with Hydrothermal influences, thanks to the relationships with the Kirckpatrick Basalt. Sedimentary interbeds deposited over lava flows of the Kirkpatrick Basalt during the Early Jurassic splitting of Gondwana represent unusual freshwater paleoenvironments, with hotter conditions that allow to the diversification of the Microbes (Archea).

Fossils

There abundant Fossils of microorganisms, as members of the group Archea and other who take advantage of the Hydrotermal activity

Spinicaudata

Ostracoda

Insecta

Unknow Insect wings are know.

Actinopterygii

Fungi

Plants

One of the best preserved Floras of the Antarctic.

See also

• Shafer Peak Formation
• Hanson Formation

References

1. P.F. Ballance, W.A. Watters The Mawson Diamictite and the Carapace Sandstone, formations of the Ferrar Group at Allan Hills and Carapace Nunatak, Victoria Land, Antarctica N. Z. J. Geol. Geophys., 14 (1971), pp. 512-527 CrossRefView Record in ScopusGoogle Scholar
2. Burgess et al., 2015 S.D. Burgess, S.A. Bowring, T.H. Fleming, D.H. Elliot High-precision geochronology links the Ferrar large igneous province with early Jurassic ocean anoxia and biotic crisis Earth Planet. Sci. Lett., 415 (2015), pp. 90-99
3. Elliot, 2013 D.H. Elliot The geological and tectonic evolution of the Transantarctic Mountains: a review Geol. Soc. Lond. Spec. Publ., 381 (2013), pp. 7-35
4. Bradshaw, 1987 M.A. Bradshaw Additional field interpretation of the Jurassic sequence at Carapace Nunatak and Coombs Hills, south Victoria Land Antarctica N. Z. J. Geol. Geophys., 30 (1987), pp. 37-49
5. ^ Babcock LE, Leslie SA, Elliot DH, Stigall AL, et al. 2006. The “Preservation Paradox”: microbes as a key to exceptional fossil preservation in the Kirkpatrick Basalt (Jurassic), Antarctica. The Sedimentary Record 4: 4–8.
6. ^ Stigall, A. L., Babcock, L. E., Briggs, D. E. G., & Leslie, S. A. (2008). Taphonomy of Lacustrine Interbeds in the Kirkpatrick Basalt (Jurassic), Antarctica. PALAIOS, 23(6), 344–355. doi:10.2110/palo.2007.p07-029r.
7. Norris, G. (1965). Triassic and Jurassic miospores and acritarchs from the Beacon and Ferrar groups, Victoria Land, Antarctica. New Zealand journal of geology and geophysics, 8(2), 236-277.
8. Bomfleur, B., Schneider, J. W., Schöner, R., Viereck-Götte, L., & Kerp, H. (2011). Fossil sites in the continental Victoria and Ferrar groups (Triassic-Jurassic) of north Victoria Land, Antarctica. Polarforschung, 80(2), 88-99.
9. ^ F. M. Carpenter. 1969. Fossil insects from Antarctica. 76:418–425.
10. P. Tasch. 1973. Jurassic beetle from southern Victoria Land, Antarctica. 47:590-592
11. ^ Schaeffer, Bobb. "A Jurassic Fish from Antarctica". American Museum of Natural History, 1972.
12. Harper, C. J., Bomfleur, B., Decombeix, A. L., Taylor, E. L., Taylor, T. N., & Krings, M. (2012). Tylosis formation and fungal interactions in an Early Jurassic conifer from northern Victoria Land, Antarctica. Review of Palaeobotany and Palynology, 175, 25-31.
13. Bomfleur, B., Schneider, J., Schöner, R., Viereck-Götte, L., Kerp, H., Cooper, A. K., & Raymond, C. R. (2007, August). Exceptionally well-preserved Triassic and Early Jurassic floras from North Victoria Land, Antarctica. In Antarctica: a keystone in a changing world. Proceedings of the 10th International Symposium on Antarctic Earth Sciences, US Geol. Surv., OF-2007-1047, extend. abstr (Vol. 34).
14. Gair, H. S., Norris, G., & Ricker, J. (1965). Early mesozoic microfloras from Antarctica. New Zealand Journal of Geology and Geophysics, 8(2), 231-235.
15. ^ J. A. Townrow. 1967. Fossil plants from Allan and Carapace Nunataks, and from the Upper Mill and Shackleton Glaciers, Antarctica. 10(2):456-473 ISBN 0-520-24209-2.
16. Hieger, T. J., Serbet, R., Harper, C. J., Taylor, T. N., Taylor, E. L., & Gulbranson, E. L. (2015). Cheirolepidiaceous diversity: An anatomically preserved pollen cone from the Lower Jurassic of southern Victoria Land, Antarctica. Review of palaeobotany and palynology, 220, 78-87.
17. Atkinson, B. A., Serbet, R., Hieger, T. J., & Taylor, E. L. (2018). Additional evidence for the Mesozoic diversification of conifers: Pollen cone of Chimaerostrobus minutus gen. et sp. nov.(Coniferales), from the Lower Jurassic of Antarctica. Review of Palaeobotany and Palynology, 257, 77-84.
18. Yao, X., Taylor, T. N., & Taylor, E. L. (1991). Silicified dipterid ferns from the Jurassic of Antarctica. Review of Palaeobotany and Palynology, 67(3-4), 353-362.

• Geologic formations of Antarctica
• Jurassic System of Antarctica
• Pliensbachian Stage
• Toarcian Stage
• Sandstone formations
• Tuff formations
• Fluvial deposits
• Paleontology in Antarctica