A Formação Serra Alta, Permiano, no centro-leste do Estado de São Paulo, Bacia do Paraná, Brasil

Warren, Lucas Veríssimo; Assine, Mário Luís; Simões, Marcello Guimarães; Riccomini, Cláudio; Anelli, Luiz Eduardo

doi:10.1590/23174889201500010008

Cited by 20 publications

(30 citation statements)

References 26 publications

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“…In other words, the studied assemblage is tied to the period of progressive continentalization and growing aridization of the Paran a Basin (see Simões et al, 1998;Warren et al, 2008) extending from the late Guadalupian to the early Lopingian, possibly to the end of the Permian at subsurface. Therefore, this paleoenvironmental scenario is completely distinct from that observed in the basal and middle portions of the Passa Dois Group (i.e., Serra Alta and Teresina formations), when storm-influenced offshore-to-coastal-plain settings prevailed in the Paran a Basin (Holz et al, 2010;Warren et al, 2015). In this context, the current contribution sheds light on the evolution of the Passa Dois Group bivalves and records an extreme faunal turnover tied to the continentalization phase of the central-western Gondwana basins with a profound influence on bivalve assemblage composition, abundance, and dominance.…”

Section: Introductionmentioning

confidence: 81%

A new Permian bivalve-dominated assemblage in the Rio do Rasto Formation, Paraná Basin, Brazil: Faunal turnover driven by regional-scale environmental changes in a vast epeiric sea

Simões

Matos

Anelli

et al. 2015

Journal of South American Earth Sciences

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a b s t r a c tThe basal portion of the Permian Rio do Rasto Formation (Serrinha Member), Passa Dois Group, Paran a Basin, Brazil, records an entirely new bivalve fauna intercalated between the underlying Pinzonella neotropica assemblage (uppermost portion of the Teresina Formation) and the overlying Leinzia similis assemblage (Rio do Rasto Formation). Mollusks of these assemblages lived in marginal shallow-water habitats of an immense epeiric sea and were dominated by endemic bivalve species. Taxonomic analysis revealed the presence of Terraia curvata (60.61%), Astartellopsis prosoclina (19.70%), Cowperesia emerita (10.61%), Leinzia curta (4.55%), Terraia bipleura (3.03%) and Beurlenella elongatella (1.52%), which are associated with conchostracans and plant remains. Species composition, abundance, and dominance in this novel assemblage differ notably from the preceding ones, suggesting a substantial evolutionary turnover. Regional-scale environmental changes recognized based on taphonomy, facies analysis, and geochemical data consist of progressive freshening of the marginal habitats of the Paran a Basin and taxic changes that include the following: (a) loss of genera, (b) decrease in bivalve abundance and ecological guilds, (c) disappearance of the dominant bivalve group (Pinzonellinae) and (d) diversification of Terrainae bivalves. The ecological signature also changed notably because only infaunal suspension-feeding bivalves are present, indicating a significant loss of functional diversity at the regional scale. Likely stressor factors (among others) are tied to freshening events, suggesting profound changes in (a) salinity, (b) primary productivity and (c) a lack of coarse, stable substrates coupled with high bioturbation rates. Hence, our regional example could offer valuable clues to benthic (bivalve) community responses in a habitat subjected to (a) rapid climate changes and (b) freshening events in shallow-water settings. Finally, the stratigraphic range of the dominant species (T. curvata) appears to be restricted to the basal portion of the Rio do Rasto Formation. Based on the presence of this species and of C. emerita, the novel assemblage is tentatively correlated with that of the Permian Gai-As Formation in the Huab region of Namibia, thus supporting previous assumptions of a seaway connecting both basins during the Guadalupian Epoch.

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Section: Introductionmentioning

confidence: 81%

A new Permian bivalve-dominated assemblage in the Rio do Rasto Formation, Paraná Basin, Brazil: Faunal turnover driven by regional-scale environmental changes in a vast epeiric sea

Simões

Matos

Anelli

et al. 2015

Journal of South American Earth Sciences

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“…The fossil (a single complete and poorly preserved left valve) was found 30 m above the basal portion of the Irati Formation (Beurlen, 1957b;Runnegar and Newell, 1971, p. 57). The rare specimen was assigned as a new species of Maackia (M. iratiensis), the dominant genus in the bivalve assemblages of the overlying Serra Alta Formation (Bondioli, 2014;Bondioli et al, 2015;Warren et al, 2015;Matos, 2016). Regrettably, repository information on the specimen (collection and reference number) is not available in Beurlen's brief note, and this fossil is probably lost.…”

Section: The Long Search For the Missing Bivalvesmentioning

confidence: 99%

“…More recently, during a broad study of the basal portion of the Passa Dois Group (see Bondioli et al, 2015;Warren et al, 2015), we had an opportunity to study the Irati Formation at its type locality in southern Brazil. Following the information provided by Márcio Kazubek, we explored the basal deposits of the Irati Formation (Taquaral Member) in the vicinity of the homonymous city in the State of Paraná.…”

Section: The Long Search For the Missing Bivalvesmentioning

confidence: 99%

“…The Irati Formation lies between the Palermo and Serra Alta formations and is delimited by regional discordances and local diastems (Holz et al, 2010a;Warren et al, 2015). On the basis of SHRIMP U-Pb dating of igneous zircons in volcanic ash beds, a 206 Pb/ 238 U age of 278.4 ± 2.2 Ma is suggested for the basal portion of the Irati Formation, indicating an Artinskian depositional age (Cisuralian epoch) (Santos et al, 2006).…”

Section: The Early Permian Irati Anoxic Eventmentioning

confidence: 99%

“…These shales record widespread dysoxic to anoxic conditions (Araújo, 2001;Araújo et al, 2001;Milani et al, 2007;Holz et al, 2010a), and are succeeded by a brief transgressive cycle (Serra Alta Formation). Deposition of this last unit is followed by a large-scale regressive phase (Teresina and Corumbataí formations) that ended with the establishment of the transitional and continental deposits (fluvial, deltaic and eolian) of the Rio do Rasto Formation (Zalán et al, 1991;Sousa et al, 1991;Rohn, 1994;Simões et al, , 2015Wesselingh, 2007;Warren et al, 2008Warren et al, , 2015Holz et al, 2010a).…”

Section: Introductionmentioning

confidence: 99%

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Permian endemic bivalves of the “Irati anoxic event”, Paraná Basin, Brazil: Taphonomical, paleogeographical and evolutionary implications

Matos

Warren

Varejão

et al. 2017

Palaeogeography, Palaeoclimatology, Palaeoecology

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Anoxic to dysoxic conditions must have existed in the Paraná Basin during the deposition of the Permian oil-bearing shales of the Irati Formation, reflecting the marine isolation of the basin from the Panthalassic Ocean. In this environment, benthic invertebrates are extremely rare, in contrast to the overlying Serra Alta and Teresina formations, which were deposited in dysoxic/oxic waters, respectively. Hence, the abundant shallow-burrowing, endemic bivalves recorded in the shales of the basal portion of the Irati Formation are one of the most distinctive features of this stratigraphic interval. Their preservation in offshore deposits is, however, a product of storm flows in shallow waters that swept the shells to distal settings. Subsequently, these were sorted by long-lasting shelf currents that produced dense (2-5 shells/20 cm 2) pavements in which shells in a hydrodynamically stable posture (convex-up) predominate, forming thin, complex shell concentrations despite their simple internal stratigraphy. The new data presented here have important paleoecologic, paleogeographic and evolutionary implications and indicate that (a) during the deposition of the oil-rich shales of the Irati Formation, numerous benthic bivalves thrived in the contemporary shallow-water bottoms of the Paraná Basin; (b) the mono-to paucispecific nature of the studied shell-rich pavements is, in part, due to hydrologic shell transport; and (c) restricted connections to open ocean waters (Panthalassa) existed during Irati times. Therefore, the origin of the endemic Passa Dois molluscan fauna occurred somewhere between the interval represented by the underlying Palermo Formation and the basal portion of the Irati Formation. Finally, these endemic bivalves appeared at least~10 million years earlier than previously thought.

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A Look into the Past: Fossils from the Campos Sulinos Region

da Rosa,

Kerber,

Pinheiro

et al. 2023

South Brazilian Grasslands

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A Formação Serra Alta, Permiano, no centro-leste do Estado de São Paulo, Bacia do Paraná, Brasil

Cited by 20 publications

References 26 publications

A new Permian bivalve-dominated assemblage in the Rio do Rasto Formation, Paraná Basin, Brazil: Faunal turnover driven by regional-scale environmental changes in a vast epeiric sea

A new Permian bivalve-dominated assemblage in the Rio do Rasto Formation, Paraná Basin, Brazil: Faunal turnover driven by regional-scale environmental changes in a vast epeiric sea

Permian endemic bivalves of the “Irati anoxic event”, Paraná Basin, Brazil: Taphonomical, paleogeographical and evolutionary implications

A Look into the Past: Fossils from the Campos Sulinos Region

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