有孔虫类化石，浮游类主要有Orbulina suturalis，Cassigerinella chipolensis，Globorotalia siakensis等，属N9-N15带，底栖类有Nephrolepidina verbeeki，N.sumatrensis，Miogypsina polymorpha，Miolepidocyclina burdigalensis，Cycloclypeus posteidae，Austrotrillina howchini等，相当大有孔虫化石带Te5-Tf1-2。钙质超微化石有Helicosphaera euphratis，Discoaster variabilis，D.hamatus，Sphenolithus moriformis，Cyclicargolithus floridanus等，相当NN4-NN9带；孢粉为Dicolpopollis kockelii- Polypodiisporites usmensis组合。为一套浅海相碎屑岩及碳酸盐岩。与上覆黄流组及下伏三亚组均为整合接触。厚208-424米。