Where: Ceará, Brazil (7.2° S, 40.0° W: paleocoordinates 8.7° S, 8.3° W)
• coordinate based on nearby landmark
When: Romualdo Formation (Santana Group), Late/Upper Aptian (122.5 - 112.0 Ma)
• Romualdo Member, Santana Formation, Lower Cretaceous, Albian
•From Melo et al. 2020: In summary, this integrated study of foraminifera, ostracodes and other microfossil data from the Romualdo Formation indicates that the local Alagoas Stage (Ostracoda Zone RT-011) can now be constrained to the Aptian. Arai and Assine 2020 also support that the Romualdo Formation is entirely Aptian in age.
• member-level stratigraphic resolution
Environment/lithology: marine; nodular lithology not reported
Size class: macrofossils
Collection methods: In 1995 the late Professor Murilo R. Lima gave me an enigmatic and badly preserved fossil nodule from the Santana Formation...The recent discovery of new, better-preserved specimens in the nodules of the Santana Formation and in the Crato Formation, as well as the preparation of two specimens using chemical techniques, allows the description of this new halecomorph.
Primary reference: P. M. Brito. 2000. A new halecomorph with two dorsal fins, Placidichthys bidorsalis n. g., n. sp. (Actinopterygii: Halecomorphi) from the Lower Cretaceous of the Araripe Basin, northeast Brazil. Comptes Rendus de l'Academie des Sciences Paris, Sciences de la Terre et des planètes 331:749-754 [G. Lloyd/G. Lloyd]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 124310: authorized by Graeme Lloyd, entered by Graeme Lloyd on 11.02.2012
Creative Commons license: CC BY (attribution)