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Río Colorado Subgroup

Coordinates: 37°54′S 68°30′W / 37.9°S 68.5°W / -37.9; -68.5
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Río Colorado Subgroup
Stratigraphic range: Santonian-Early Campanian
~86–79 Ma
TypeSubgroup
Unit ofNeuquén Group
Sub-unitsAnacleto & Bajo de la Carpa Formations
UnderliesMalargüe Group
 Allen Formation
OverliesRío Neuquén Subgroup
 Plottier Formation
ThicknessUp to 240 m (790 ft)
Lithology
PrimaryMudstone, sandstone
OtherSiltstone, limestone
Location
Coordinates37°54′S 68°30′W / 37.9°S 68.5°W / -37.9; -68.5
Approximate paleocoordinates40°48′S 53°00′W / 40.8°S 53.0°W / -40.8; -53.0
RegionNeuquén & Río Negro Provinces
Country Argentina
ExtentNeuquén Basin
Río Colorado Subgroup is located in Argentina
Río Colorado Subgroup
Río Colorado Subgroup (Argentina)

The Río Colorado Subgroup, formerly named as Río Colorado Formation, is a Late Cretaceous (Santonian to Early Campanian) geologic subgroup of the Neuquén Basin in northern Patagonia, Argentina. It belongs to the Neuquén Group and contains the Anacleto and Bajo de la Carpa Formations. The subgroup overlies the Río Neuquén Subgroup and is overlain by the Allen Formation of the Malargüe Group, separated by an unconformity dated to 79 Ma.[1] Dinosaur remains diagnostic to the genus level are among the fossils that have been recovered from the formation.[2]

Fossil content

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Ornithischians

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Ornithischians reported from the Río Colorado Subgroup
Genus Species Province Stratigraphic position Material Notes Images

Gasparinisaura[3]

G. cincosaltensis[3]

Anacleto Formation

"Skull and postcranial skeleton, postcranial elements, juvenile to subadult."[4]

Gasparinisaura

Sauropods

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Titanosaur eggs are known from Neuquén Province.[5]

Sauropods reported from the Río Colorado Subgroup
Genus Species Province Stratigraphic position Material Notes Images

Antarctosaurus[3]

A. wichmannianus[3]

Anacleto Formation
Antarctosaurus

Bonatitan[3]

B.reigi[3]

Allen Formation

Loricosaurus[6]

L. scutatus[6]

Microcoelus[5]

M. patagonicus[5]

Bajo de la Carpa Formation

Possible synonym of Neuquensaurus

Neuquensaurus[7]

N. australis[7]

Anacleto Formation

"Titanosaurus"[3]

"T." robustus[3]

Anacleto Formation

Titanosaurus[7]

T. nanus[7]

Bajo de la Carpa Formation

Theropods

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Theropods reported from the Río Colorado Subgroup
Genus Species Province Stratigraphic position Material Notes Images

Abelisaurus[3]

A. comahuaensis[3]

Anacleto Formation

"Partial skull."[8]

Abelisaurus
Alvarezsaurus
Aucasaurus
Patagopteryx
Velocisaurus

Alvarezsaurus[5]

A. calvoi[5]

Bajo de la Carpa Formation

"Partial postcranial skeleton."[9]

Aucasaurus[5]

A. garridoi[5]

Anacleto Formation

"Nearly complete skeleton."[8]

Neuquenornis[5]

N. volans[5]

Bajo de la Carpa Formation

"Partial skeleton."[10]

Patagopteryx[5]

P. deferrariisi[5]

Bajo de la Carpa Formation

"Many skeletons."[11]

Velocisaurus[5]

V. unicus[5]

Bajo de la Carpa Formation

"Partial hind limb."[8]

See also

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References

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  1. ^ Leanza et al., 2004, p.63
  2. ^ Weishampel et al., 2004, pp. 603-604
  3. ^ a b c d e f g h i j k l m n o p q "63.10 Provincia de Río Negro, Argentina; 4. Río Colorado Formation," in Weishampel, et al. (2004). Page 604.
  4. ^ "Table 18.1," in Weishampel, et al. (2004). Page 395.
  5. ^ a b c d e f g h i j k l m n o p q r s t u v "63.6 Provincia de Neuquén, Argentina; 3. Río Colorado Formation," in Weishampel, et al. (2004). Page 603.
  6. ^ a b Listed as "?Loricosaurus scutatus" in "63.6 Provincia de Neuquén, Argentina; 3. Río Colorado Formation" and "63.10 Provincia de Río Negro, Argentina; 4. Río Colorado Formation," in Weishampel, et al. (2004). Pages 603-604.
  7. ^ a b c d "63.6 Provincia de Neuquén, Argentina; 3. Río Colorado Formation" and "63.10 Provincia de Río Negro, Argentina; 4. Río Colorado Formation," in Weishampel, et al. (2004). Pages 603-604.
  8. ^ a b c "Table 3.1," in Weishampel, et al. (2004). Page 49.
  9. ^ "Table 11.1," in Weishampel, et al. (2004). Page 211.
  10. ^ "Table 11.1," in Weishampel, et al. (2004). Page 213.
  11. ^ "Table 11.1," in Weishampel, et al. (2004). Page 212.

Bibliography

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  • Leanza, H.A.; Apesteguia, S.; Novas, F.E.; De la Fuente, M.S. (2004), "Cretaceous terrestrial beds from the Neuquén Basin (Argentina) and their tetrapod assemblages", Cretaceous Research, 25: 61–87, Bibcode:2004CrRes..25...61L, doi:10.1016/j.cretres.2003.10.005, retrieved 2019-02-16
  • Weishampel, David B.; Dodson, Peter; Osmólska, Halszka (2004), The Dinosauria, 2nd edition, Berkeley: University of California Press, pp. 1–880, ISBN 0-520-24209-2, retrieved 2019-02-21