FANDOM


Caturrita Formation
FormacaoX
Caturrita Formation. Source: UFSM
Type Geological formation
Age Carnian - Norian
Unit of Santa Maria Supersequence
Underlies Mata Sandstone
Overlies Alemoa Member, Santa Maria Formation
Thickness 30 - 60 m
Lithology
Primary sandstones, siltstones
Location
Named for Caturrita, barrio of Santa Maria


Region Geopark of Paleorrota in Rio Grande do Sul
Country Brazil
Extent 250 km
Paleorrota3
Geopark of Paleorrota


The Caturrita Formation is a rock formation found in Rio Grande do Sul, Brazil. Its sediments were deposited in the Paraná Basin. The formation has a late Carnian to early Norian age (Upper Triassic) and forms part of the Santa Maria Supersequence in the upper section of the Rosário do Sul Group.

StratigraphyEdit

The sediments of the Caturrita Formation belong to the second unit of the Santa Maria Supersequence and overlie the Alemoa Member of the Santa Maria Formation. The clayey sediments of the Alemoa Member gradually give way to the more sandy, rarely conglomeratic, Caturrita Formation, which finishes with an unconformity. After this erosional event follow the Rhaetian sediments of the Mata Sandstone, the third unit of the Santa Maria Supersequence.

The Caturrita Formation was once regarded as a member of the stratigraphically higher Botucatu Formation[1] or was expanded to include the Mata Sandstone.[2]

The Caturrita Formation reaches a maximum thickness of 60 meters, but generally oscillates around values of 30 meters.

AgeEdit

So far no absolute ages have been determined, but the formation is assigned to a late Carnian to early Norian age on paleontological grounds, i.e. an age range of about 220 to 215 Ma.

Geographical occurrenceEdit

Outcrops of the Caturrita Formation are found in the Brazilian state of Rio Grande do Sul. From the town of Taquari they follow for 250 kilometers a thin band in the central part of the state in an east-westerly fashion right up to Mata.

Depositional environmentEdit

The sediments of the Caturrita Formation belong to the upper section of the Santa Maria Supersequence. In terms of sequence stratigraphy they are equivalent to a highstand systems tract. The scarlet, ephemeral, mainly clayey fluvio-lacustrine deposits of the Alemoa Member gradually cede to more sandy[3], occasionally gravelly deposits of a braided river-system that was operational all-year-round. These deposits of the Caturrita Formation settled out in an alluvial flood-plain. The changeover in sedimentary facies was accompanied by a climatic change to more humid conditions.[4]

The sediments are of continental nature (red beds) and form massive sandstone and siltstone bodies.[5]

Vertebrate faunaEdit

The Caturrita Formation contains a biozone for tetrapods, the so-called “Ictidosauria Assemblage Zone″ Ca-1.[6]Ictidosaurs are trithelodontid cynodonts, a sister group of the mammals. This is the reason, why this biozone recently has been renamed as “Mammaliamorpha Cenozone” to underline the importance of the cynodont fossils.[7] The Caturrita Formation also hosts the stratigraphic marker level “Jachaleria”[8] named after the dicynodont Jachaleria candelariensis. Dinosaurs and other vertebrates have been discovered as well.

In 1998, tracks of prosauropods have been found near Faxinal do Soturno that were most likely caused by Unaysaurus tolentinoi.[9].

The fossil finds are concentrated around three major areas:

The following taxa have been discovered so far in the Caturrita Formation:

Cynodonts Edit

Cynodonts of the Caturrita Formation
Taxa Presence Notes Images

Genus:

  1. B. riograndensis

Genus:

  1. B. quadrangularis

Genus:

Genus:

  1. I. hernandezi

Genus:

  1. R. guaibensis

Dicynodonts Edit

Dicynodonts of the Caturrita Formation
Taxa Presence Notes Images

Genus:

Genus:

  1. J. candelariensis
Caturrita Formation
250px
Caturrita Formation. Source: UFSM
Type Geological formation
Age Carnian - Norian
Unit of Santa Maria Supersequence
Underlies Mata Sandstone
Overlies Alemoa Member, Santa Maria Formation
Thickness 30 - 60 m
Lithology
Primary sandstones, siltstones
Location
Named for Caturrita, barrio of Santa Maria


Coordinates -29.695042, -53.795403
Region Geopark of Paleorrota in Rio Grande do Sul
Extent 250 km
Paleorrota3
Geopark of Paleorrota


The Caturrita Formation is a rock formation found in Rio Grande do Sul, Brazil. Its sediments were deposited in the Paraná Basin. The formation has a late Carnian to early Norian age (Upper Triassic) and forms part of the Santa Maria Supersequence in the upper section of the Rosário do Sul Group.

EtymologyEdit

The formation received this name, because Caturrita is a neighbourhood (Barrio) of Santa Maria. [10] [11] In Portuguese Caturrita also designates the Monk parakeet.

StratigraphyEdit

The sediments of the Caturrita Formation belong to the second unit of the Santa Maria Supersequence and overlie the Alemoa Member of the Santa Maria Formation. The clayey sediments of the Alemoa Member gradually give way to the more sandy, rarely conglomeratic, Caturrita Formation, which finishes with an unconformity. After this erosional event follow the Rhaetian sediments of the Mata Sandstone, the third unit of the Santa Maria Supersequence.

The Caturrita Formation was once regarded as a member of the stratigraphically higher Botucatu Formation[12] or was expanded to include the Mata Sandstone.[13]

The Caturrita Formation reaches a maximum thickness of 60 meters, but generally oscillates around values of 30 meters.

AgeEdit

So far no absolute ages have been determined, but the formation is assigned to a late Carnian to early Norian age on paleontological grounds, i.e. an age range of about 220 to 215 million years BP.

Geographical occurrenceEdit

Outcrops of the Caturrita Formation are found in the Brazilian state of Rio Grande do Sul. From the town of Taquari they follow for 250 kilometers a thin band in the central part of the state in an east-westerly fashion right up to Mata.

Depositional environmentEdit

The sediments of the Caturrita Formation belong to the upper section of the Santa Maria Supersequence. In terms of sequence stratigraphy they are equivalent to a highstand systems tract. The scarlet, ephemeral, mainly clayey fluvio-lacustrine deposits of the Alemoa Member gradually cede to more sandy[14], occasionally gravelly deposits of a braided river-system that was operational all-year-round. These deposits of the Caturrita Formation settled out in an alluvial flood-plain. The changeover in sedimentary facies was accompanied by a climatic change to more humid conditions.[15]

The sediments are of continental nature (red beds) and form massive sandstone and siltstone bodies.[16]

Vertebrate faunaEdit

The Caturrita Formation contains a biozone for tetrapods, the so-called “Ictidosauria Assemblage Zone″ Ca-1.[17]Ictidosaurs are trithelodontid cynodonts, a sister group of the mammals. This is the reason, why this biozone recently has been renamed as “Mammaliamorpha Cenozone” to underline the importance of the cynodont fossils.[18] The Caturrita Formation also hosts the stratigraphic marker level “Jachaleria”[19] named after the dicynodont Jachaleria candelariensis. Dinosaurs and other vertebrates have been discovered as well.

In 1998 tracks of prosauropods have been found near Faxinal do Soturno that were most likely caused by Unaysaurus tolentinoi.[20].

The fossil finds are concentrated around three major areas:

  • Santa Maria and northern surroundings (Água Negra)
  • Faxinal do Soturno
  • Candelária and surroundings (Linha São Luis)

The following taxa have been discovered so far in the Caturrita Formation:

Cynodonts Edit

Cynodonts of the Caturrita Formation
Taxa Presence Notes Images

Genus:

  1. B. riograndensis

Genus:

  1. B. quadrangularis

Genus:

Genus:

  1. I. hernandezi

Genus:

  1. R. guaibensis

Dicynodonts Edit

Dicynodonts of the Caturrita Formation
Taxa Presence Notes Images

Genus:

Genus:

  1. J. candelariensis

Dinosaurs Edit

Dinosaurs of the Caturrita Formation
Taxa Presence Notes Images

Genus:

  1. G. candelariensis[21]
  1. Geographically present in Rio Grande do Sul, Brazil.[21]
Sauropod

Genus:

  1. S. agudoensis
  1. Geographically present in Rio Grande do Sul, Brazil
Sauropod

Genus:

  1. S. tupiniquim
  1. Geographically present in Rio Grande do Sul, Brazil
Sauropod

Genus:

  1. S. pricei
  1. Geographically present in Rio Grande do Sul, Brazil
Theropod

Genus:

  1. U. tolentinoi
  1. Geographically present in Rio Grande do Sul, Brazil
Sauropod

Infraorder:

  1. Unnamed genus.[21]
  1. Geographically present in Rio Grande do Sul, Brazil.[21]

Sauropsida Edit

Sauropsida of the Caturrita Formation
Taxa Presence Notes Images

Genus:

  1. C. brasiliensis
Sphenodontia

Genus:

Genus:

  1. S. caliodon
Procolophonia

Order:

  1. Undetermined genus

See alsoEdit

ReferencesEdit

  1. ^ Bortoluzzi, C.A. 1974. Contribuição à Geologia da Região de Santa Maria, Rio Grande do Sul, Brasil. Pesquisas, 4 (1):7-86
  2. ^ Andreis, R.R.; Bossi, G.E. & Montardo, D.K. 1980. O Grupo Rosário do Sul (Triássico) no Rio grande do Sul. In: CONGRESSO BRASILEIRO DE GEOLOGIA,31, Balneário 16 Camboriú, 1980. Anais... Balneário de Camboriú, SBG, v. 2, p.659-673.
  3. ^ Zerfass, H.; Lavina, E.L.; Schultz, C.L.; Garcia, A.J.V.; Faccini, U.F. & Chemale Jr., F. 2003. Sequence stratigraphy of continental Triassic strata of Southernmost Brazil: a contribution to Southwestern Gondwana palaeogeography and palaeoclimate. Sedimentary Geology, 161:85-105.
  4. ^ Holz, M. und Scherer, C.M.S., 2000, Sedimentological and paleontological evidence of paleoclimatic change during the Southbrazilian Triassic: the register of a global trend towards a humid paleoclimate: Zentralblatt für Geologie und Paläontologie, Teil I, v. 11-12, p. 1589-1609.
  5. ^ Rubert, R. R. & Schultz, C. L. 2004. — Um novo horizonte de correlação para o Triássico Superior do Rio Grande do Sul. Pesquisas em Geociências 31: 71-88.
  6. ^ Oliveira É. V. 2006. — Reevaluation of Therioherpeton cargnini Bonaparte & Barberena, 1975 (Probainognathia, Therioherpetidae) from the Upper Triassic of Brazil. Geodiversitas 28 (3) : 447-465.
  7. ^ Soares, M.B. & Schultz, C.L., 2006. Proposta de nova denominação para a Cenozona de Ictidosauria, do Triássico Superior (Formação Caturrita) do Rio Grande do Sul. V Simpósio Brasileiro de Paleontologia de Vertebrados, Boletim de Resumos, p. 41, Santa Maria, RS, 2006.
  8. ^ Schultz. C.L.; Scherer, C.M.S. & Barberena, M.C. 1994. Uma nova proposta de zoneamento estratigráfi co para o Triássico Superior Sul-Rio-Grandense. In: Congresso Brasileiro de Geologia, 38, Camboriú - SC, 1994. Boletim de Resumos, p. 107-108.
  9. ^ Rafael Costa Da Silva, Ismar De Souza Carvalho, Cibele Schwanke, 2006. Vertebrate dinoturbation from the Caturrita Formation (Late Triassic, Paraná Basin), Rio Grande do Sul State, Brazil. Gondwana Research 11 (2007) 303–310.
  10. ^ http://www.lenep.uenf.br/~severian/es-sm-sincro.html Formação Santa Maria, (in Portuguese)
  11. ^ http://www.pesquisasemgeociencias.ufrgs.br/arquivos/ARTIGO311.pdf Paleoformações, (in Portuguese)
  12. ^ Bortoluzzi, C.A. 1974. Contribuição à Geologia da Região de Santa Maria, Rio Grande do Sul, Brasil. Pesquisas, 4 (1):7-86
  13. ^ Andreis, R.R.; Bossi, G.E. & Montardo, D.K. 1980. O Grupo Rosário do Sul (Triássico) no Rio grande do Sul. In: CONGRESSO BRASILEIRO DE GEOLOGIA,31, Balneário 16 Camboriú, 1980. Anais... Balneário de Camboriú, SBG, v. 2, p.659-673.
  14. ^ Zerfass, H.; Lavina, E.L.; Schultz, C.L.; Garcia, A.J.V.; Faccini, U.F. & Chemale Jr., F. 2003. Sequence stratigraphy of continental Triassic strata of Southernmost Brazil: a contribution to Southwestern Gondwana palaeogeography and palaeoclimate. Sedimentary Geology, 161:85-105.
  15. ^ Holz, M. und Scherer, C.M.S., 2000, Sedimentological and paleontological evidence of paleoclimatic change during the Southbrazilian Triassic: the register of a global trend towards a humid paleoclimate: Zentralblatt für Geologie und Paläontologie, Teil I, v. 11-12, p. 1589-1609.
  16. ^ Rubert, R. R. & Schultz, C. L. 2004. — Um novo horizonte de correlação para o Triássico Superior do Rio Grande do Sul. Pesquisas em Geociências 31: 71-88.
  17. ^ Oliveira É. V. 2006. — Reevaluation of Therioherpeton cargnini Bonaparte & Barberena, 1975 (Probainognathia, Therioherpetidae) from the Upper Triassic of Brazil. Geodiversitas 28 (3) : 447-465.
  18. ^ Soares, M.B. & Schultz, C.L., 2006. Proposta de nova denominação para a Cenozona de Ictidosauria, do Triássico Superior (Formação Caturrita) do Rio Grande do Sul. V Simpósio Brasileiro de Paleontologia de Vertebrados, Boletim de Resumos, p. 41, Santa Maria, RS, 2006.
  19. ^ Schultz. C.L.; Scherer, C.M.S. & Barberena, M.C. 1994. Uma nova proposta de zoneamento estratigráfi co para o Triássico Superior Sul-Rio-Grandense. In: Congresso Brasileiro de Geologia, 38, Camboriú - SC, 1994. Boletim de Resumos, p. 107-108.
  20. ^ Rafael Costa Da Silva, Ismar De Souza Carvalho, Cibele Schwanke, 2006. Vertebrate dinoturbation from the Caturrita Formation (Late Triassic, Paraná Basin), Rio Grande do Sul State, Brazil. Gondwana Research 11 (2007) 303–310.
  21. ^ a b c d e f Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Triassic, South America)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 527–528. ISBN 0-520-24209-2.

Ad blocker interference detected!


Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.