Sobral Formation

Sobral Formation
Stratigraphic range: Danian
~66–61.6 Ma

PreꞒ

Ꞓ

O

S

D

C

P

T

J

K

Pg

N

↓
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
Underlies	& 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°WCoordinates: 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

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. 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. doi:10.1371/journal.pone.0114743. PMC 4262473. PMID 25493546.

Further reading[]

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): 89–98.
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: 9–27. doi:10.1016/s0034-6667(02)00244-0.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. 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. doi:10.1371/journal.pone.0114743. PMC 4262473. PMID 25493546.

[1]

[2]

Sobral Formation

See also[]

References[]

Further reading[]