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{{Infobox rockunit |
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{{Infobox rockunit |
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| name = Mawson Formation |
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| name = Mawson Formation |
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| image =Oreochima WilliamStout.png |
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| image = Oreochima WilliamStout.png |
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| caption =Freswater environment of the Mawson Formation, with Hidrotermal influences and the fish ] |
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| caption = Freshwater environment of the Mawson Formation, with hydrothermal influences and the fish '']'' |
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| type = ] |
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| type = ] |
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| age ={{fossilrange|183}} ] to ] |
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| age = ]-]<br>~{{fossilrange|185|181}} |
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| period = Early Jurassic |
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| period = Early Jurassic |
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|prilithology = pond; lithified, volcaniclastic mudstone |
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| prilithology = ] ] |
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| otherlithology = pond; lithified, volcaniclastic, gray, blue mudstone |
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| otherlithology = Volcaniclastic gray & blue mudstone |
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| namedfor = |
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| namedfor = ] |
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| namedby = |
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| namedby = |
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| region = ] |
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| region = ] |
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| country = ] |
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| country = ] |
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| coordinates = 76.9° S, 159.4° E |
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| coordinates = {{coord|76.9|S|159.4|E|display=inline,title}} |
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| paleocoordinates = {{coord|60.1|S|46.5|E|display=inline}} |
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| unitof = Ferrar Large Igneous Province |
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| subunits = Carapace Sandstone member |
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| unitof = ] |
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| underlies = |
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| subunits = Carapace Sandstone Member |
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| overlies = |
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| underlies = |
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| thickness = |
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| overlies = |
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| extent = |
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| thickness = |
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| area = |
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| extent = |
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| map = |
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| area = |
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| map = {{Location map+ | Antarctica |
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| map_caption = |
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| relief = 1 |
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| width = 250 |
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| float = center |
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| places = |
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{{Location map~ | Antarctica |
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| lat_deg = -76.9 |
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| lon_deg = 159.4 |
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| mark = Blue pog.svg |
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| marksize = 12 |
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}} |
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}} |
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| map_caption = |
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}} |
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The '''Mawson Formation''' is a ] in ], dating to roughly between 185-181 ] and covering the ]-] ] of the ] Period in the ].<ref name=Ballance1971>Ballance et al., 1971</ref><ref name=Burgess2015>Burgess et al., 2015</ref> Vertebrate remains are known from the formation.<ref name=Elliot2013>Elliot, 2013</ref> |
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The '''Mawson Formation''' is a ] in ], dating to roughly between 185-181 ] and covering the ]-] ] of the ] Period in the ].<ref>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</ref><ref>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</ref> Vertebrate remains are known from the formation.<ref>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</ref> The Formation represents an ancient lake, with ] influences, thanks to the relationships with the Kirckpatrick Basalt.<ref>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</ref> 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 (])<ref name="Hydrotermal">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.</ref><ref name="HydroDepth">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.</ref>. |
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==Fossils== |
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== Description == |
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The formation was deposited in an ancient lake, with ] influences, thanks to the relationships with the Kirckpatrick Basalt.<ref name=Bradshaw1987>Bradshaw, 1987</ref> 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 (])<ref name="Hydrotermal">Babcock et al., 2006</ref><ref name="HydroDepth">Stigall et al., 2008</ref> |
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There abundant Fossils of microorganisms, as members of the group ] and other who take advantage of the Hydrotermal activity<ref name="Hydrotermal" /><ref name="HydroDepth" /><ref>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.</ref> |
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== Fossil content == |
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===Spinicaudata=== |
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There abundant Fossils of microorganisms, as members of the group ] and other who take advantage of the hydrothermal activity<ref name="Hydrotermal" /><ref name="HydroDepth" /><ref name=Norris1965>Norris, 1965</ref> |
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=== Spinicaudata === |
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{| class="wikitable sortable" |
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! Notes |
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! Notes |
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| '']'' |
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| ''C. disgregaris'' |
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'']''<ref name="Hydrotermal" /><ref name="HydroDepth" /> |
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| Carapace Nunatak |
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''Carapacestheria disgregaris'' |
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| Carapaces |
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| Related to the modern ''] mexicanus''<ref name="Hydrotermal" /><ref name="HydroDepth" /> |
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Carapace Nunatak |
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Carapaces.<ref name="Hydrotermal" /><ref name="HydroDepth" /> |
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Related to the modern ''] mexicanus'' |
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=== Fish === |
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===Ostracoda=== |
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! Notes |
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! Notes |
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| '']'' |
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| ''O. ellioti'' |
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'']''<ref name="Hydrotermal" /><ref name="HydroDepth" /> |
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| Carapace Nunatak |
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''Darwinula sp'' |
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| Various specimens |
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| An ] ]<ref name=schaeffer>Schaeffer, 1972</ref> |
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Carapace Nunatak |
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Valves.<ref name="Hydrotermal" /><ref name="HydroDepth" /> |
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Common Lower Jurassic ]n |
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===Insecta=== |
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=== Insects === |
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Fossil insect wings not described to the genus level are known from the formation.<ref name=Bomfleur2011>Bomfleur et al., 2011</ref> |
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Unknow Insect wings are know.<ref>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.</ref> |
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{| class="wikitable sortable" |
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! Notes |
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! Notes |
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| '']'' |
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| ''C. antartica'' |
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'']''<ref name="InsectAnta">F. M. Carpenter. 1969. Fossil insects from Antarctica. 76:418–425.</ref>. |
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| Carapace Nunatak |
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''C. antartica'' |
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| wings |
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| A ]<ref name="InsectAnta">Carpenter, 1969</ref> |
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Carapace Nunatak |
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wings.<ref name="InsectAnta" /> |
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A ] |
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| ''U. sehopfi'' |
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'']''<ref name="InsectAnta">F. M. Carpenter. 1969. Fossil insects from Antarctica. 76:418–425.</ref>. |
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| Carapace Nunatak |
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''U. sehopfi'' |
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| A nearly complete specimen |
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| A ] nymph<ref name="InsectAnta" /> |
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Carapace Nunatak |
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A nearly complete specimen.<ref name="InsectAnta" /> |
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A ] nymph |
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| ] |
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| Indeterminate |
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]<ref>P. Tasch. 1973. Jurassic beetle from southern Victoria Land, Antarctica. 47:590-592</ref> |
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| Carapace Nunatak |
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Indeterminate |
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| Wing |
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| Unnamed and non compared<ref name=Tasch1973>Tasch, 1973</ref> |
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Carapace Nunatak |
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Wing. |
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Unnamed and non compared. |
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===Actinopterygii=== |
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=== Ostracoda === |
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{| class="wikitable sortable" |
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! Notes |
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! Notes |
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| '']'' |
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| ''Darwinula sp.'' |
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'']''<ref name=schaeffer>Schaeffer, Bobb. . American Museum of Natural History, 1972.</ref> |
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| Carapace Nunatak |
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''O. ellioti'' |
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| Valves |
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| Common Early Jurassic ]<ref name="Hydrotermal" /><ref name="HydroDepth" /> |
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Carapace Nunatak |
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Various specimens.<ref name=schaeffer /> |
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An ] ] |
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===Fungi=== |
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=== Fungi === |
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{| class="wikitable sortable" |
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! Notes |
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! Notes |
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| ] |
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| Indeterminate |
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]<ref>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.</ref> |
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| Carapace Nunatak |
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Indeterminate |
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| Wood affected by ] fungi |
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| Infestation traces and fungal parasitic interaction on several plants<ref name=Harper2012>Harper et al., 2012</ref> |
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Carapace Nunatak |
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Wood affected by pathogenic fungi. |
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Infestation traces and fungal parasitic interaction on several plants. |
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===Plants=== |
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=== Plants === |
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One of the best preserved fossil flora of the Antarctic.<ref name=Bomfleur2007>Bomfleur et al., 2007</ref><ref name=Gair1965>Gair et al., 1965</ref> |
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One of the best preserved Floras of the Antarctic.<ref>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).</ref><ref>Gair, H. S., Norris, G., & Ricker, J. (1965). Early mesozoic microfloras from Antarctica. New Zealand Journal of Geology and Geophysics, 8(2), 231-235.</ref> |
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{| class="wikitable sortable" |
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! Notes |
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! Notes |
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| '']'' |
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| ''N. warreni'' |
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'']''<ref name="NunatakFlora">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}}.</ref> |
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| Carapace Nunatak |
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''N. warreni'' |
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| Specimens |
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| A member of the family ]<ref name="NunatakFlora">Townrow, 1967</ref> |
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Carapace Nunatak |
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Specimens.<ref name="NunatakFlora" /> |
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A member of the family ]. |
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| '']'' |
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| ''M. warrenii'' |
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'']''<ref name="NunatakFlora" /> |
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| Carapace Nunatak |
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''M. warrenii'' |
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| Specimens |
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| A member of the family ]<ref name="NunatakFlora" /> |
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Carapace Nunatak |
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Specimens.<ref name="NunatakFlora" /> |
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A member of the family ]. |
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| '']'' |
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| Indeterminate |
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'']''<ref name="NunatakFlora" /> |
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| Carapace Nunatak |
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Indeterminate |
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| Specimens |
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| A member of the ]<ref name="NunatakFlora" /> |
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Carapace Nunatak |
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Specimens.<ref name="NunatakFlora" /> |
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A member of the ]. |
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| '']'' |
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| ''C. elliotii'' |
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'']''<ref>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.</ref> |
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| Carapace Nunatak |
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''C. elliotii'' |
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| Specimens |
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| A member of the ]<ref name=Hieger2015>Hieger et al., 2015</ref> |
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Carapace Nunatak |
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Specimens. |
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A member of the ]. |
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| '']'' |
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| ''C. minutus'' |
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'']''<ref>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.</ref> |
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| Carapace Nunatak |
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''C. minutus'' |
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| Specimens |
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| An indeterminate conifer pollen cone{{what|date=October 2019}}<ref name=Atkinson2018>Atkinson et al., 2018</ref> |
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Carapace Nunatak |
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Specimens. |
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An indeterminate Conifer Pollen cone. |
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| '']'' |
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| ''P. stormensis'' |
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'']''<ref>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.</ref> |
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| Carapace Nunatak |
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''P. stormensis'' |
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| Specimens |
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| Fern Petioles{{what|date=October 2019}}<ref name=Yao1991>Yao et al., 1991</ref> |
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Carapace Nunatak |
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Specimens. |
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Fern Petioles. |
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| '']'' |
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| Indeterminate |
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'']''<ref name="Hydrotermal" /><ref name="HydroDepth" /> |
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| Carapace Nunatak |
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Indeterminate |
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| Specimens |
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| ] '']''<ref name="Hydrotermal" /><ref name="HydroDepth" /> |
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Carapace Nunatak |
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Specimens.<ref name="Hydrotermal" /><ref name="HydroDepth" /> |
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] incertade sedis. |
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== See also == |
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{{Portal|Geology|Paleontology|Dinosaurs|Jurassic|Prehistory of South America}} |
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* ] |
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* ] |
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* ] |
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* ] |
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* ] |
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==See also== |
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== References == |
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{{reflist|30em}} |
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{{Portal|Earth sciences|Paleontology|Dinosaurs||}} |
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*] |
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*] |
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=== Bibliography === |
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==References== |
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<!--Most recent publications first--> |
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{{Reflist}} |
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* 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 |
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* 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 |
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* 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 |
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* D.H. Elliot The geological and tectonic evolution of the Transantarctic Mountains: a review Geol. Soc. Lond. Spec. Publ., 381 (2013), pp. 7-35 |
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* 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 |
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* 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 |
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* 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 |
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* 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) |
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* 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 |
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* 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 |
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* P. Tasch. 1973. Jurassic beetle from southern Victoria Land, Antarctica. 47:590-592 |
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* 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 |
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* Schaeffer, Bobb. . American Museum of Natural History, 1972 |
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* 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 |
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* F. M. Carpenter. 1969. Fossil insects from Antarctica 76: 418–425 |
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* 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}} |
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* Gair, H. S., Norris, G., & Ricker, J. (1965). Early mesozoic microfloras from Antarctica. New Zealand Journal of Geology and Geophysics, 8(2), 231-235 |
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* 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 |
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{{DEFAULTSORT:Mawson Formation}} |
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Fossil insect wings not described to the genus level are known from the formation.
One of the best preserved fossil flora of the Antarctic.