It has been dated by means of planktonic foraminifers and magnetostratigraphy. Ammonia is a genus of marine foraminifers. Cyclammina is a genus of foraminifers in the family Cyclamminidae. Taxa used include plants, molluscs, foraminifers, mammals and dinoflagellates. Additional fossils include radiolarians, arenaceous foraminifers, and remains of sponges. The formation contains foraminifers, mollusks, and coccoliths. These pearl oysters feed on infusorians, foraminifers, radiolarians and other small planktonic organisms. Evidence of DNRA has also been found in marine foraminifers. The typical skeletal association includes foraminifers, red algae and molluscs. Yet findings of foraminifers appear to indicate for older ages, that is Eocene. Gastropods, thin-shelled and thick-shelled ostracods and some rare aggloutinated foraminifers are present in this facies. Baggina is a genus of foraminifers in the order Rotaliida. Evidence of subpolar foraminifers (Turborotalita quinqueloba) indicate open water conditions in that area. These mixotrophic foraminifers are particularly common in nutrient-poor oceanic waters. Mixotrophic foraminifers are particularly common in nutrient-poor oceanic waters.