Araripina region (general) (Cretaceous of Brazil)

Where: Pernambuco, Brazil (7.6° S, 40.6° W: paleocoordinates 9.0° S, 8.9° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Romualdo Formation (Santana Group), Late/Upper Aptian (122.5 - 113.0 Ma)

• described as "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: lagoonal or restricted shallow subtidal; gray, green, silty mudstone and concretionary limestone

• "brackish or quasi-marine conditions. It represents either a lagoonal setting or a basin with only restricted connections to waters of normal marine salinity."
• "The Romualdo Member comprises a series of greyish-green silty mudtsones with bands of lenticular, ostracod-rich limestones and laminated carbonate concretions, the latter usually containing vertebrate fossils." Fossil here found in a "flat, finely laminated carbonate concretion."

Size class: macrofossils

Preservation: soft parts

Collection methods: mechanical,

Primary reference: D. M. Martill, E. Frey, H.-D. Sues and A. R. I. Cruickshank. 2000. Skeletal remains of a small theropod dinosaur with associated soft structures from the Lower Cretaceous Santana Formation of northeastern Brazil. Canadian Journal of Earth Sciences 37(6):891-900 [M. Carrano/M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 28050: authorized by Matthew Carrano, entered by Matthew Carrano on 22.01.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Reptilia
 Theropoda - Compsognathidae
Mirischia asymmetrica n. gen. n. sp.
Mirischia asymmetrica n. gen. n. sp. Naish et al. 2004 compsognathid