Açu Formation
Early Cretaceous geologic formation in Ceará, Brazil
| Açu Formation | |
|---|---|
| Stratigraphic range: Albian ~112–100 Ma PreꞒ Ꞓ O S D C P T J K Pg N | |
| Type | Geological formation |
| Unit of | Apodi Group |
| Underlies | Jandaíra Formation |
| Overlies | Alagamar Formation |
| Lithology | |
| Primary | Sandstone |
| Location | |
| Coordinates |   Açu Formation (Brazil) |
The Açu Formation is an Early Cretaceous (Albian) geologic formation of the Potiguar Basin in Ceará, northeastern Brazil. The formation comprises coarse-grained sandstones deposited in a fluvio-deltaic environment. The Açu Formation, belonging to the Apodi Group, has provided fossils of an indeterminate rebbachisaurid.
Description
The Açu Formation was deposited in a passive margin setting, overlying the Alagamar Formation and is overlain by the Jandaíra Formation. In the petroleum producing Potiguar Basin, the formation is a reservoir rock.[1]
Fossil content
The following fossils were reported from the formation:[2]
- Reptiles
- Dinosaurs
- Carcharodontosauria indet.
- Maniraptora indet.
- Megaraptora indet.
- Rebbachisauridae indet.[3]
- Spinosauridae indet.
- Tiamat valdecii[4]
- Titanosauria Indet.[5]
- Dinosaurs
- Fish
- Cartilaginous fish
- Ray-finned fis
- Amiidae Indet.
- Bawitius bartheli
- Lepisosteiformes Indet.
- Tharrhas araripis
- Pycnodontiformes indet.
- Lobe-finned fish
- Arganodus cf. tinguidiensis
- Ceratodus latissimus
- Mawsonia cf. gigas
See also
References
- ^ Maraschin et al., 2010, p.87
- ^ Açu Formation at Fossilworks.org
- ^ Gomes da Costa Pereira et al., 2020
- ^ Pereira, P. V. L. G. C.; Bandeira, K. L. N.; Vidal, L. S.; Ribeiro, T. B.; Candeiro, C. R. A.; Bergqvist, L. P. (2024). "A new sauropod species from north-western Brazil: biomechanics and the radiation of Titanosauria (Sauropoda: Somphospondyli)". Zoological Journal of the Linnean Society. doi:10.1093/zoolinnean/zlae054.
- ^ Pereira, P.V.L.G.C.; Marinho, T.S.; Candeiro, C.R.A.; Bergqvist, L.P. (2018). "A new titanosaurian (Sauropoda, Dinosauria) osteoderm from the Cretaceous of Brazil and its significance". Ameghiniana. 55 (6): 644–650. doi:10.5710/AMGH.26.08.2018.3168.
Bibliography
- Gomes da Costa Pereira, Paulo Victor; Theo Baptista Ribeiro; Stephen Louis Brusatte; Carlos Roberto Dos Anjos Candeiro; Thiago da Silva Marinho, and Lilian Paglarelli Bergqvist. 2020. Theropod (Dinosauria) diversity from the Potiguar basin (Early-late Cretaceous Albian – Cenomanian), Northeast Brazil. Cretaceous Research in press. Article 104517. . doi:10.1016/j.cretres.2020.104517
- Maraschin, Anderson; Ana Maria P. Mizusaki; P.M. Vasconcelos, and Ruth Hinrichs. 2010. Depositional age definition of the Açu Formation (Potiguar Basin, northeastern Brazil) through 40Ar-39Ar dating of early-authigenic K-feldspar overgrowths. Pesquisas em Geociencias 37. 85-96. Accessed 2020-06-18.
