Figure 1. Stratigraphic profile and scheme of the Romualdo Formation (Cretaceous—Aptian/Albian) where the specimens were collected. Vertical exposure=32m.
The Barbalha, Crato, and Ipubi formations are commonly associated with freshwater sediments, and the Romualdo For- mation has the characteristics of a lagoon with fossil echinoids
(Manso and Hessel, 2012). The Romualdo Formation is com- posed of layers of dark shale at the base that alternate with layers of fine-grained, poorly consolidated sandstone. Near the top of