Santa Maria Formation
Santa Maria Formation | |
---|---|
Stratigraphic range: Carnian ~ | |
Type | Geological formation |
Unit of | Rosário do Sul Group |
Sub-units | Passo das Tropas & Alemoa Members |
Underlies | Caturrita Formation |
Overlies | Sanga do Cabral Formation |
Location | |
Coordinates | 29°41′42″S 53°47′43″W / 29.695042°S 53.795403°W |
Region | Rio Grande do Sul |
Country | Brazil |
Extent | Paraná Basin |
The Santa Maria Formation is a sedimentary rock formation found in Rio Grande do Sul, Brazil. It has a Late Ladinian[1][2] to Early Norian age[3][2] (Middle to Late Triassic[4][5]), and is notable for its fossils of early dinosaurs and other dinosauromorphs,[6][7] including the herrerasaurid Staurikosaurus, the basal sauropodomorphs Buriolestes and Saturnalia, and the lagerpetid Ixalerpeton.[8][9][10][11] It received this name because it was discovered first in the city of Santa Maria, on the central region of Rio Grande do Sul state.
A U-Pb (Uranium decay) dating of a locality of the Upper portion of the Santa Maria Formation dated around 233.23±0.73 million years ago, putting that locality 1.5 million years older than the Ischigualasto Formation, instead being in the temporal range of the Los Chañares Formation, and making the two formations (Santa Maria and Ischigualasto) approximately equal as having the earliest dinosaur localities.[3][7][12][13][14]
The Santa Maria Formation is part of the Candelária Sequence,[2][4] and is biostratigraphically subdivided into Dinodontosaurus (latest Ladinian-earliest Carnian), Santacruzodon (earliest Carnian-middle Carnian), and Hyperodapedon (middle Carnian-latest Carnian) Assemblage Zones (from the oldest to youngest).[15][5] Moreover, the Hyperodapedon Assemblage Zone is subdivided into Hyperodapedon Acme Zone (most of the zone, where the rhynchosaur Hyperodapedon is widely reported) and Exaeretodon Zone (restricted to 3 known and sampled localities, where Hyperodapedon is almost absent, but the traversodontid cynodont Exaeretodon is widely reported).[16][5] These subdivisions are also known as Lower and Upper Hyperodapedon Assemblage Zone, respectively.[15][16]
Vertebrate paleofauna
Temnospondyls
Temnospondyls of the Santa Maria Formation | ||||||
---|---|---|---|---|---|---|
Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
Compsocerops[17] | C. sp.[18] | Rio Grande do Sul | Upper Santa Maria Formation, Alemoa Member, Candelária Sequence, Hyperodapedon Assemblage Zone, Hyperodapedon Acme Zone | A partial skull | A chigutisaurid temnospondyl |
Lepidosauromorphs
Lepidosauromorphs of the Santa Maria Formation | ||||||
---|---|---|---|---|---|---|
Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
Clevosaurus | C. hadroprodon | Rio Grande do Sul | Upper Santa Maria Formation, Alemoa Member, Candelária Sequence, Hyperodapedon Assemblage Zone, Exaeretodon Zone | Cranial remains | A clevosaurid rhynchocephalian |
Parareptiles
Parareptiles of the Santa Maria Formation | ||||||
---|---|---|---|---|---|---|
Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
Candelaria | C. barbouri | Dona Francisca-Candelária, Rio Grande do Sul | Lower Santa Maria Formation, Alemoa Member, Pinheiros-Chiniquá Sequence, Dinodontosaurus Assemblage Zone | Cranial and postcranial remains | A owenetiid procolophonoid |
Synapsids
Synapsids of the Santa Maria Formation | ||||||
---|---|---|---|---|---|---|
Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
Alemoatherium[19] | A. huebneri | Santa Maria, Rio Grande do Sul | Upper Santa Maria Formation, Alemoa Member, Candelária Sequence, Hyperodapedon Assemblage Zone, Hyperodapedon Acme Zone | A partial dentary | A probainognathian cynodont | |
Aleodon | A. cromptoni | Rio Grande do Sul | Lower Santa Maria Formation, Alemoa Member, Pinheiros-Chiniquá Sequence, Dinodontosaurus Assemblage Zone | Cranial and postcranial remains | A probainognathian cynodont | |
Bonacynodon | B. schultzi | Rio Grande do Sul | Lower Santa Maria Formation, Alemoa Member, Pinheiros-Chiniquá Sequence, Dinodontosaurus Assemblage Zone | Cranial remains | A probainognathian cynodont | |
Candelariodon[20] | C. barberenai | Rio Grande do Sul | Lower Santa Maria Formation, Alemoa Member, Pinheiros-Chiniquá Sequence, Dinodontosaurus Assemblage Zone | A partial mandible having some complete teeth | A probainognathian cynodont | |
Charruodon[21] | C. tetracuspidatus | Candelária, Rio Grande do Sul | Upper Santa Maria Formation, Alemoa Member, Candelária Sequence, Hyperodapedon Assemblage Zone, Hyperodapedon Acme Zone | A partial dentary | A probainognathian cynodont[22] | |
Chiniquodon[23] | C. theotonicus | Rio Grande do Sul | Lower Santa Maria Formation, Alemoa Member, Pinheiros-Chiniquá Sequence, Dinodontosaurus Assemblage Zone | Several cranial remains | A chiniquodontid cynodont | |
Chiniquodon[23] | C. sp. | Santa Cruz, Rio Grande do Sul | Middle Santa Maria Formation, Alemoa Member, Santa Cruz Sequence, Santacruzodon Assemblage Zone | A chiniquodontid cynodont | ||
Dinodontosaurus | D. pedroanum | Rio Grande do Sul | Lower Santa Maria Formation, Alemoa Member, Pinheiros-Chiniquá Sequence, Dinodontosaurus Assemblage Zone | Cranial and postcranial remains | A kannemeyeriiform dicynodont | |
Exaeretodon[24] | E. major | Rio Grande do Sul | Upper Santa Maria Formation, Alemoa Member, Candelária Sequence, Hyperodapedon Assemblage Zone, Exaeretodon Zone | Cranial and postcranial remains | A traversodontid cynodont | |
Exaeretodon[24] | E. riograndensis | Rio Grande do Sul | Upper Santa Maria Formation, Alemoa Member, Candelária Sequence, Hyperodapedon Assemblage Zone, Exaeretodon Zone | Cranial and postcranial remains | A traversodontid cynodont | |
Gomphodontosuchus[25] | G. brasiliensis | Santa Maria, Rio Grande do Sul | Upper Santa Maria Formation, Alemoa Member, Candelária Sequence, Hyperodapedon Assemblage Zone, Hyperodapedon Acme Zone | Cranial remains | A traversodontid cynodont | |
Luangwa | L. sudamericana | Rio Grande do Sul | Lower Santa Maria Formation, Alemoa Member, Pinheiros-Chiniquá Sequence, Dinodontosaurus Assemblage Zone | Cranial remains | A traversodontid cynodont | |
Massetognathus | M. ochagavie | Rio Grande do Sul | Lower and Middle Santa Maria Formation, Alemoa Member, Santa Cruz nad Pinheiros-Chiniquá Sequences, Santacruzodon Assemblage Zone and Dinodontosaurus Assemblage Zone | Cranial and postcranial remains | A traversodontid cynodont | |
Massetognathus | M. pascuali | Rio Grande do Sul | Lower Santa Maria Formation, Alemoa Member, Pinheiros-Chiniquá Sequence, Dinodontosaurus Assemblage Zone | Cranial remains | A traversodontid cynodont | |
Menadon | M. besairiei | Rio Grande do Sul | Middle Santa Maria Formation, Alemoa Member, Santa Cruz Sequence, Santacruzodon Assemblage Zone | A traversodontid cynodont | ||
Protheriodon | P. estudianti | Rio Grande do Sul | Lower Santa Maria Formation, Alemoa Member, Pinheiros-Chiniquá Sequence, Dinodontosaurus Assemblage Zone | Cranial remains | A probainognathian cynodont | |
Protuberum[26] | P. cabralensis | Rio Grande do Sul | Lower Santa Maria Formation, Alemoa Member, Pinheiros-Chiniquá Sequence, Dinodontosaurus Assemblage Zone | Partial articulated skeleton including skull, vertebrae and ribs | A traversodontid cynodont | |
Prozostrodon[27] | P. brasiliensis | Santa Maria-São João do Polêsine, Rio Grande do Sul | Upper Santa Maria Formation, Alemoa Member, Candelária Sequence, Hyperodapedon Assemblage Zone, Hyperodapedon Acme Zone | Cranial remains | A probainognathian cynodont | |
Santacruzgnathus[28] | S. abdalai | Santa Cruz, Rio Grande do Sul | Middle Santa Maria Formation, Alemoa Member, Santa Cruz Sequence, Santacruzodon Assemblage Zone | Cranial remains | A probainognathian cynodont | |
Santacruzodon[29] | S. hopsoni[29] | Santa Cruz, Rio Grande do Sul[29] | Middle Santa Maria Formation, Alemoa Member, Santa Cruz Sequence, Santacruzodon Assemblage Zone | Cranial remains[29] | A traversodontid cynodont[29] | |
Scalenodon | S. ribeiroae | Rio Grande do Sul | Lower Santa Maria Formation, Alemoa Member, Pinheiros-Chiniquá Sequence, Dinodontosaurus Assemblage Zone | A traversodontid cynodont | ||
Stahleckeria | S. potens | Rio Grande do Sul | Lower Santa Maria Formation, Alemoa Member, Pinheiros-Chiniquá Sequence, Dinodontosaurus Assemblage Zone | Cranial and postcranial remains | A stahleckeriid dicyndont | |
Therioherpeton[30] | T. cargnini | Santa Maria, Rio Grande do Sul | Upper Santa Maria Formation, Alemoa Member, Candelária Sequence, Hyperodapedon Assemblage Zone, Hyperodapedon Acme Zone | Cranial remains | A probainognathian cynodont | |
Traversodon | T. stahleckeri | Rio Grande do Sul | Lower Santa Maria Formation, Alemoa Member, Pinheiros-Chiniquá Sequence, Dinodontosaurus Assemblage Zone | A traversodontid cynodont | ||
Trucidocynodon[31] | T. riograndensis | Rio Grande do Sul | Upper Santa Maria Formation, Alemoa Member, Candelária Sequence, Hyperodapedon Assemblage Zone, Exaeretodon Zone | An ecteniniid probainognathiancynodont |
Archosauromorphs of the Santa Maria Formation | ||||||
---|---|---|---|---|---|---|
Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
Aetobarbakinoides[32] | A. brasiliensis | Santa Maria, Rio Grande do Sul | Upper Santa Maria Formation, Alemoa Member, Candelária Sequence, Hyperodapedon Assemblage Zone, Hyperodapedon Acme Zone | Partial postcranial skeleton | A stagonolepidid aetosaur pseudosuchian | |
Aetosauroides [33] | A. scagliai | Santa Maria, Rio Grande do Sul | Upper Santa Maria Formation, Alemoa Member, Candelária Sequence, Hyperodapedon Assemblage Zone, Hyperodapedon Acme Zone | An almost complete skull and incomplete postcranial elements | An aetosaur pseudosuchian | |
Bagualosaurus [34] | B. agudoensis | Agudo, Rio Grande do Sul | Upper Santa Maria Formation, Alemoa Member, Candelária Sequence, Hyperodapedon Assemblage Zone, Exaeretodon Zone | Almost complete skull with lower jaws, several vertebrae, partial pelvic girdle, partial hindlimbs | A basal sauropodomorph | |
Barberenasuchus[35] | B. brasiliensis | Santa Maria, Rio Grande do Sul | Upper Santa Maria Formation, Alemoa Member, Candelária Sequence, Hyperodapedon Assemblage Zone, Hyperodapedon Acme Zone | poorly preserved skull and axis vertebra | An archosauriform of uncertain affinities | |
Brasinorhynchus[36] | B. mariantensis | Porto Mariante, Rio Grande do Sul | Lower Santa Maria Formation, Alemoa Member, Pinheiros-Chiniquá Sequence, Dinodontosaurus Assemblage Zone | A complete skull, atlas, axis, third neck vertebra | A stenaulorhynchine rhynchosaur archosauromorph | |
Buriolestes [37][38] | B. schultzi | São João do Polêsine, Rio Grande do Sul | Upper Santa Maria Formation, Alemoa Member, Candelária Sequence, Hyperodapedon Assemblage Zone, Hyperodapedon Acme Zone | parts of the skull, vertebrae, left forelimb, and left hindlimb | The basalmost sauropodomorph dinosaur | |
Cerritosaurus [39] | C. binsfeldi | Santa Maria, Rio Grande do Sul | Upper Santa Maria Formation, Alemoa Member, Candelária Sequence, Hyperodapedon Assemblage Zone, Hyperodapedon Acme Zone | Badly preserved skull and postcranial elements | A proterochampsid archosauromorph | |
Chanaresuchus[40][41] | C. bonapartei | Candelária-Santa Cruz do Sul, Rio Grande do Sul | Middle Santa Maria Formation, Alemoa Member, Santa Cruz Sequence, Santacruzodon Assemblage Zone | Disarticulated cranial and postcranial elements | A proterochampsid archosauromorph | |
Dagasuchus [42] | D. santacruzensis | Santa Cruz do Sul, Rio Grande do Sul | Middle Santa Maria Formation, Alemoa Member, Santa Cruz Sequence, Santacruzodon Assemblage Zone | an illium and a pair of ischia | A "rauisuchian"/loricatan pseudosuchian archosaur | |
Decuriasuchus [43] | D. quartacolonia | Dona Francisca, Rio Grande do Sul | Lower Santa Maria Formation, Alemoa Member, Pinheiros-Chiniquá Sequence, Dinodontosaurus Assemblage Zone | Assemblage of several individuals, which together preserved virtually all the skeleton | A "rauisuchian"/loricatan pseudosuchian archosaur | |
Dynamosuchus [44] | D. collisensis | Agudo, Rio Grande do Sul | Upper Santa Maria Formation, Alemoa Member, Candelária Sequence, Hyperodapedon Assemblage Zone, Exaeretodon Zone | Semi articulated partial skull and disarticulated fragmentary postcranial skeleton | An ornithosuchid pseudosuchian archosaur | |
Gnathovorax [45] | G. cabreirai | São João do Polêsine, Rio Grande do Sul | Upper Santa Maria Formation, Alemoa Member, Candelária Sequence, Hyperodapedon Assemblage Zone, Hyperodapedon Acme Zone | A complete semi-articulated skeleton, part of a multiataxic fossil assemblage, including two cynodonts and two rhynchosaurs | A herrerasaurid dinosaur | |
Hyperodapedon [46][15] | H. sanjuanensis H. mariensis H. huenei |
Santa Maria-Agudo-Candelária, Rio Grande do Sul | Upper Santa Maria Formation, Alemoa Member, Candelária Sequence, Hyperodapedon Assemblage Zone | Complete skulls, and most postcranial elements | A hyperodapedontine rhynchosaur archosauromorph | |
Ixalerpeton [37] | I. polesinensis | São João do Polêsine, Rio Grande do Sul | Upper Santa Maria Formation, Alemoa Member, Candelária Sequence, Hyperodapedon Assemblage Zone, Hyperodapedon Acme Zone | Partial skull including a partial maxilla and both dentaries, most of the presacral vertebrae, two sacral vertebrae, several caudal verterae and associated chevrons, scapula and humerus, femora of at least two individuals, and tibia | A basal lagerpetid ornithodiran | |
Nhandumirim [47] | N. waldsangae | Santa Maria, Rio Grande do Sul | Upper Santa Maria Formation, Alemoa Member, Candelária Sequence, Hyperodapedon Assemblage Zone, Hyperodapedon Acme Zone | Some vertebrae, partial pelvic girdle, partial hindlimb | A juvenile saturnaliidsauropodomorph dinosaur[48][49][50][51][52] | |
Pagosvenator [53] | P. candelariensis | Candelária, Rio Grande do Sul | Lower Santa Maria Formation, Alemoa Member, Pinheiros-Chiniquá Sequence, Dinodontosaurus Assemblage Zone | Poorly preserved skull and cervical elements | An erpetosuchid archosaur | |
Pampadromaeus[54] | P. barberenai | Agudo, Rio Grande do Sul | Upper Santa Maria Formation, Alemoa Member, Candelária Sequence, Hyperodapedon Assemblage Zone, Exaeretodon Zone | Almost complete skull and lower jaws, several vertebrae, partial pectoral girdle, partial forelimb, partial pelvic girdle, partial hindlimb | A basal sauropodomorph dinosaur | |
"Polesinesuchus" [55] | "P. aurelioi" | São João do Polêsine, Rio Grande do Sul | Upper Santa Maria Formation, Alemoa Member, Candelária Sequence, Hyperodapedon Assemblage Zone, Hyperodapedon Acme Zone | Several postcranial elements | An immature aetosaur pseudosuchian, possible synonym of Aetosauroides scagliai[56] | |
Prestosuchus [57][58][59] | P. chiniquensis P. loricatus |
Candelária-Dona Francisca-São Pedro do Sul, Rio Grande do Sul | Lower Santa Maria Formation, Alemoa Member, Pinheiros-Chiniquá Sequence, Dinodontosaurus Assemblage Zone | Virtually all the skeleton is known | A "rauisuchian"/loricatan pseudosuchian archosaur | |
Procerosuchus[60] | P. celer | São Pedro do Sul, Rio Grande do Sul | Lower Santa Maria Formation, Alemoa Member, Pinheiros-Chiniquá Sequence, Dinodontosaurus Assemblage Zone | A "rauisuchian"/loricatan pseudosuchian archosaur | ||
Proterochampsa | P. nodosa | Candelária, Rio Grande do Sul | Upper Santa Maria Formation, Alemoa Member, Candelária Sequence, Hyperodapedon Assemblage Zone, Hyperodapedon Acme Zone | Skull and partial postcranial elements | A proterochampsid archosauromorph | |
Rauisuchus [61] | R. tiradentes | Santa Maria, Rio Grande do Sul | Upper Santa Maria Formation, Alemoa Member, Candelária Sequence, Hyperodapedon Assemblage Zone, Hyperodapedon Acme Zone | Incomplete skeleton including skull elements, several vertebrae and partial hindlimb | A "rauisuchian"/loricatan pseudosuchian archosaur | |
Rhadinosuchus [62] | R. gracilis | Santa Maria, Rio Grande do Sul | Upper Santa Maria Formation, Alemoa Member, Candelária Sequence, Hyperodapedon Assemblage Zone, Hyperodapedon Acme Zone | Badly preserved skull and postcranial elements | A proterochampsid archosauromorph | |
Saturnalia [11] | S. tupinquim | Santa Maria, Rio Grande do Sul | Upper Santa Maria Formation, Alemoa Member, Candelária Sequence, Hyperodapedon Assemblage Zone, Hyperodapedon Acme Zone | Three partial skeleton, including partial skull and lower jaw, complete cervical, dorsal and partial caudal vertebral series, pectoral girdle, partial forelimb, pelvic girdle, partial hindlimb | A basal sauropodomorph dinosaur | |
Spondylosoma [63] | S. absconditum | São Pedro do Sul, Rio Grande do Sul | Lower Santa Maria Formation, Alemoa Member, Pinheiros-Chiniquá Sequence, Dinodontosaurus Assemblage Zone | Several postcranial remains | An avemetatarsalian aphanosaur | |
Staurikosaurus [8][9] | S. pricei | Santa Maria, Rio Grande do Sul | Upper Santa Maria Formation, Alemoa Member, Candelária Sequence, Hyperodapedon Assemblage Zone, Hyperodapedon Acme Zone | Partial postcranial skeleton with mandible | A basal herrerasaurid dinosaur | |
Unnamed lagerpetid[7] | Unnamed | Santa Maria, Rio Grande do Sul | Upper Santa Maria Formation, Alemoa Member, Candelária Sequence, Hyperodapedon Assemblage Zone, Hyperodapedon Acme Zone | Specimen UFSM 11611 (partial left femur) | A basal lagerpetid dinosauromorph |
Formations
See also
References
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- ^ Desojo, Julia B.; Ezcurra, Martin D.; Kischlat, Edio E. (2012). "A new aetosaur genus (Archosauria: Pseudosuchia) from the early Late Triassic of southern Brazil". Zootaxa. 3166: 1–33. doi:10.11646/zootaxa.3166.1.1.
- ^ Da-Rosa, Átila Augusto Stock; Paes-Neto, Voltaire Dutra; Schultz, Cesar Leandro; Desojo, Julia Brenda; Brust, Ana Carolina Biacchi (2018-08-15). "Osteology of the first skull of Aetosauroides scagliai Casamiquela 1960 (Archosauria: Aetosauria) from the Upper Triassic of southern Brazil (Hyperodapedon Assemblage Zone) and its phylogenetic importance". PLOS ONE. 13 (8): e0201450. Bibcode:2018PLoSO..1301450B. doi:10.1371/journal.pone.0201450. ISSN 1932-6203. PMC 6093665. PMID 30110362.
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- ^ Mattar, L.C.B. 1987. Descrição osteólogica do crânio e segunda vértebrata cervical de Barberenasuchus brasiliensis Mattar, 1987 (Reptilia, Thecodontia) do Mesotriássico do Rio Grande do Sul, Brasil. Anais, Academia Brasileira de Ciências, 61: 319–333
- ^ Leandro Schultz, Cesar; Cardoso Langer, Max; Chinaglia Montefeltro, Felipe (2016). "A new rhynchosaur from south Brazil (Santa Maria Formation) and rhynchosaur diversity patterns across the Middle-Late Triassic boundary". Paläontologische Zeitschrift. 90 (3): 593–609. doi:10.1007/s12542-016-0307-7. hdl:11449/161986. S2CID 130644209.
- ^ a b Cabreira, S.F.; Kellner, A.W.A.; Dias-da-Silva, S.; da Silva, L.R.; Bronzati, M.; de Almeida Marsola, J.C.; Müller, R.T.; de Souza Bittencourt, J.; Batista, B.J.; Raugust, T.; Carrilho, R.; Brodt, A.; Langer, M.C. (2016). "A Unique Late Triassic Dinosauromorph Assemblage Reveals Dinosaur Ancestral Anatomy and Diet". Current Biology. 26 (22): 3090–3095. doi:10.1016/j.cub.2016.09.040. PMID 27839975.
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(help) - ^ "http://tede2.pucgoias.edu.br:8080/handle/tede/3645". doi:10.18315/argumentum.v10i3.16911.s5842.
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