Sobral Formation: Difference between revisions

Sobral Formation
Sobral Formation
Stratigraphic range: Danian; ~66–61.6 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Unit of	Marambio Group
Underlies	Cross Valley & La Meseta Formations
Overlies	Lopez de Bertodano Formation
Thickness	250 m (820 ft)
Lithology
Primary	Siltstone, mudstone
Other	Concretion, sandstone
Location
Coordinates	64°18′S 56°42′W / 64.3°S 56.7°W
Approximate paleocoordinates	63°12′S 66°36′W / 63.2°S 66.6°W
Region	Seymour Island, James Ross Island group
Country	Antarctica
	; Geologic map of Seymour Island, Antarctica with the Sobral Formation in brown

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The Sobral Formation is a palaeontological formation located in Antarctica. It dates to the Danian stage of the Lower Paleocene period.^[1]

Spectacular fossils documenting marine and terrestrial ecosystems soon after the (non-avian) dinosaurs became extinct at the Cretaceous-Paleogene boundary are found in this formation.^[2] One of the most significant sites is on Seymour Island.

References

^ Bowman, V.; Ineson, J.; Riding, J.; Crame, J.; Francis, J.; Condon, D.; Whittle, R.; Ferraccioli, F. (2016). "The Paleocene of Antarctica: Dinoflagellate cyst biostratigraphy, chronostratigraphy and implications for the palaeo-Pacific margin of Gondwana". Gondwana Research. 38: 132–148. Bibcode:2016GondR..38..132B. doi:10.1016/j.gr.2015.10.018.
^ Crame, J.A.; Beu, A.G.; Ineson J.R.; Francis J.A.; Whittle R.J.; Bowman V.C. (2014). "The Early Origin of the Antarctic Marine Fauna and Its Evolutionary Implications". PLOS ONE. 7 (12): e114743. Bibcode:2014PLoSO...9k4743C. doi:10.1371/journal.pone.0114743. PMC 4262473. PMID 25493546.

Baldoni M. A., Barreda V. D. (1986). "Estudio palinológico de las formaciones López de Bertodano y Sobral, Isla Vicecomodoro Marambio, Antártida". Boletín del IG-USP, Serie Científica. 17 (17): 89–98. doi:10.11606/issn.2316-8986.v17i0p89-96.
Filkorn H. F. (1994). "Fossil scleractinian corals from James Ross Basin, Antarctica". Antarctic Research Series. 65: 1–96.
Poole I., Mennega A. M. W., Cantrill D. J. (2003). "Valdivian ecosystems in the Late Cretaceous and Early Tertiary of Antarctica: further evidence from myrtaceous and eucryphiaceous fossil wood" (PDF). Review of Palaeobotany and Palynology. 124 (1–2): 9–27. Bibcode:2003RPaPa.124....9P. doi:10.1016/s0034-6667(02)00244-0. hdl:1874/31608. S2CID 129281012.{{cite journal}}: CS1 maint: multiple names: authors list (link)

[Bowman-1] Bowman, V.; Ineson, J.; Riding, J.; Crame, J.; Francis, J.; Condon, D.; Whittle, R.; Ferraccioli, F. (2016). "The Paleocene of Antarctica: Dinoflagellate cyst biostratigraphy, chronostratigraphy and implications for the palaeo-Pacific margin of Gondwana". Gondwana Research. 38: 132–148. Bibcode:2016GondR..38..132B. doi:10.1016/j.gr.2015.10.018.

[Crame-2] Crame, J.A.; Beu, A.G.; Ineson J.R.; Francis J.A.; Whittle R.J.; Bowman V.C. (2014). "The Early Origin of the Antarctic Marine Fauna and Its Evolutionary Implications". PLOS ONE. 7 (12): e114743. Bibcode:2014PLoSO...9k4743C. doi:10.1371/journal.pone.0114743. PMC 4262473. PMID 25493546.

[1]

[2]

@@ Line 1: / Line 1: @@
+{{Short description|Paleontological Formation in Antarctica}}
-:''For the part of the Portuguese [[Lourinhã Formation]], see [[Sobral Unit]].''
+{{For|the part of the Portuguese Lourinhã Formation|Sobral Unit}}
-The '''Sobral Formation''' is a [[paleontology|palaeontological]] formation located in [[Antarctica]]. It dates to the [[Danian]] stage of the Lower [[Paleocene]] period.
+{{Infobox rockunit
+| name = Sobral Formation
+| image =
+| caption =
+| type = [[Geological formation]]
+| age = [[Danian]]<br />~{{fossil range|66|61.6}}
+| period = Danian
+| prilithology = [[Siltstone]], [[mudstone]]
+| otherlithology = Concretion, [[sandstone]]
+| namedfor =
+| namedby =
+| region = [[Seymour Island]], [[James Ross Island group]]
+| country = [[Antarctica]]
+| coordinates = {{coord|64.3|S|56.7|W|display=inline,title}}
+| paleocoordinates = {{coord|63.2|S|66.6|W|display=inline}}
+| underlies = [[Cross Valley Formation|Cross Valley]] & [[La Meseta Formation]]s
+| overlies = [[Lopez de Bertodano Formation]]
+| unitof = [[Marambio Group]]
+| subunits =
+| thickness = {{convert|250|m|ft|abbr=on}}
+| extent =
+| area =
+| map = Geologic map of Seymour Island, Antarctica.png
+| map_caption = Geologic map of Seymour Island, Antarctica with the Sobral Formation in brown
+}}
+The '''Sobral Formation''' is a [[paleontology|palaeontological]] formation located in [[Antarctica]]. It dates to the [[Danian]] stage of the Lower [[Paleocene]] period.<ref name="Bowman">{{cite journal |author1=Bowman, V. |title=The Paleocene of Antarctica: Dinoflagellate cyst biostratigraphy, chronostratigraphy and implications for the palaeo-Pacific margin of Gondwana |year=2016 |journal=Gondwana Research |volume=38 |pages=132–148 |doi=10.1016/j.gr.2015.10.018 |author2=Ineson, J. |author3=Riding, J. |author4=Crame, J. |author5=Francis, J. |author6=Condon, D. |author7=Whittle, R. |author8=Ferraccioli, F.|bibcode=2016GondR..38..132B |doi-access=free }}</ref>
-Spectacular [[fossil]]s documenting the wildlife soon after the (non-[[bird|avian]]) [[dinosaur]]s became [[extinct]] are found in this formation. One of the most significant sites is on [[Seymour Island]].
+Spectacular [[fossil]]s documenting marine and terrestrial ecosystems soon after the (non-[[bird|avian]]) [[dinosaur]]s became [[extinct]] at the [[Cretaceous-Paleogene boundary]] are found in this formation.<ref name="Crame">{{cite journal |author1=Crame, J.A. |title=The Early Origin of the Antarctic Marine Fauna and Its Evolutionary Implications |year=2014 |journal=PLOS ONE |volume=7 |issue=12 |pages=e114743 |doi=10.1371/journal.pone.0114743 |author2=Beu, A.G. |author3=Ineson J.R. |author4=Francis J.A. |author5=Whittle R.J. |author6=Bowman V.C.|pmc=4262473 |pmid=25493546|bibcode=2014PLoSO...9k4743C |doi-access=free }}</ref> One of the most significant sites is on [[Seymour Island]].
-== See also ==<!-- Revista de la Asociación Geológica Argentina 62 (2): 236- 241 -->
+== See also ==
+{{Portal|Geology|Paleontology}}
+* [[List of fossiliferous stratigraphic units in Antarctica]]
 * [[List of fossil sites]]
+== References ==
-{{Phanerozoic eon nav|cat_prefix=|cat_suffix=}}
+{{Reflist}}
+== Further reading ==
-[[Category:Graham Land]]
+* {{cite journal | author = Baldoni M. A., Barreda V. D. | year = 1986 | title = Estudio palinológico de las formaciones López de Bertodano y Sobral, Isla Vicecomodoro Marambio, Antártida | journal = Boletín del IG-USP, Serie Científica | volume = 17 | issue = 17 | pages = 89–98 | doi = 10.11606/issn.2316-8986.v17i0p89-96 | doi-access = free }}
-[[Category:Cenozoic Antarctica]]
+* {{cite journal | author = Filkorn H. F. | year = 1994 | title = Fossil scleractinian corals from James Ross Basin, Antarctica | journal = Antarctic Research Series | volume = 65 | pages = 1–96 }}
-[[Category:Paleocene geology]]
+* {{cite journal | author = Poole I., Mennega A. M. W., Cantrill D. J. | year = 2003 | title = Valdivian ecosystems in the Late Cretaceous and Early Tertiary of Antarctica: further evidence from myrtaceous and eucryphiaceous fossil wood | url =https://dspace.library.uu.nl/bitstream/1874/31608/1/Review%20of%20Palaeobotany%20and%20Palynology%20124%20%282003%29%201-2.pdf | journal = Review of Palaeobotany and Palynology | volume = 124 | issue = 1–2 | pages = 9–27 | doi=10.1016/s0034-6667(02)00244-0| bibcode = 2003RPaPa.124....9P | hdl = 1874/31608 | s2cid = 129281012 }}
-[[Category:Geologic formations of Antarctica]]
-[[Category:Paleontological sites of Antarctica]]
+[[Category:Geologic formations of Antarctica]]
+[[Category:Cenozoic Antarctica]]
-{{regional-geology-stub}}
+[[Category:Paleocene Series]]
-{{paleo-site-stub}}
+[[Category:Paleogene System of Antarctica]]
+[[Category:Danian Stage]]
+[[Category:Siltstone formations]]
+[[Category:Mudstone formations]]
+[[Category:Shallow marine deposits]]
+[[Category:Graham Land]]