Taphonomic analyses of Conularia quichua (Cnidaria, Conulariidae) from Pimenteira Formation (Middle Devonian), Parnaíba Basin, Tocantins State, Brazil

Author(s)

Felipe Nascimento Sousa ^[1] ; Ana Laura Dangió ^[2] ; Renato Pirani Ghilardi ^[3]

Affiliation

^[1] Universidade Estadual Paulista “Júlio de Mesquita Filho”. Faculdade de Ciências. Departamento de Ciências Biológicas, Laboratório de Paleontologia de Macroinvertebrados - Brasil

^[2] Universidade Estadual Paulista “Júlio de Mesquita Filho”. Faculdade de Ciências. Departamento de Ciências Biológicas, Laboratório de Paleontologia de Macroinvertebrados - Brasil

^[3] Universidade Estadual Paulista “Júlio de Mesquita Filho”. Faculdade de Ciências. Departamento de Ciências Biológicas, Laboratório de Paleontologia de Macroinvertebrados - Brasil

• Document type: Journal article
• Source: BRAZILIAN JOURNAL OF GEOLOGY; v. 54, n. 2 2024-10-14.

Abstract

Abstract Conulariids are extinct scyphozoans, have benthic and sessile life modes, and inhabited shallow marine platforms. Taphonomic studies of these animals from the Parnaíba Basin are scarce, distinctly from the Paraná Basin. The present work seeks to analyze the taphonomic characteristics of Conularia quichua from the Pimenteira Formation, Parnaíba Basin, and infer deposition events that influenced this fossiliferous concentration. The material is housed at Laboratório de Paleontologia de Macroinvertebrados (LAPALMA) and consists of 43 specimens. The taphonomic signatures used in the analyses were orientation in relation to the bedding plane, concentration, degree of preservation, and theca filling. The cluster and correspondence analyses evidenced two taphonomic classes for single-unit, fragile skeletons of conulariids from Pimenteira Formation: the taphonomic class 1 comprehends obliquely, filled, and complete skeletons; the taphonomic class 2 comprehends concordantly, fragmented, flattened, grouped, and isolated skeletons. A high-stand system tract, after the maximum transgressive surface of the Pimenteira Formation, is interpreted to be the depositional environment of this concentration, where an episodic high-energy event was responsible for the fossiliferous lens. In addition, the lack of preserved calcium carbonate shells suggests acidic conditions, assuming that diagenetic control occurred in this accumulation. (AU)

• FAPESP's process: 16/18275-4 - Paleobiogeography and migratory routes of paleoinvertebrates of Devonian of Brazil
• Grantee: Renato Pirani Ghilardi
• Support Opportunities: Regular Research Grants
• FAPESP's process: 20/12409-4 - Paleobiogeography and migratory routes of devonian paleoinvertebrates from Brazilian Intracratonic Basins of Paraná, Parecis, Parnaíba and Alto Tapajós
• Grantee: Renato Pirani Ghilardi
• Support Opportunities: Regular Research Grants