赤道几内亚里奥姆尼盆地K-1井白垩纪生物地层

CRETACEOUS BIOSTRATIGRAPHY FROM WELL K-1 IN THE OMNI BASIN OF EQUATORIAL GUINEA

赤道几内亚境内西部里奥姆尼(Rio Muni)盆地K-1井白垩纪地层含丰富的沟鞭藻类,孢粉,钙质超微和介形类等化石,自下而上可以划分出3个生物组合带,A带含孢粉Classopollis-Cicatricosisporites-Inaperturopollenites-Afropollis组合和介形类Hourcqia,Petrobrasia等,时代属于Aptian—Albian期。B带含孢粉Schizaeoisporites-Ephedripites-Jugella-Tricolpites组合,沟鞭藻类Dinogymnium,Oligosphaeridium,Impletosphaeridium,Florentinia,以及钙质超微化石Eiffelithus eximius,Lithastrinus grillii,Eprolithus moratus等,时代为Cenomanian—Santonian期。C带含孢粉Polypodiaceae-Psophosphaera-Proteacidites-Tricolpopollenites组合,沟鞭藻类Peridiniaceae,Dinogymnium,Tenua,Spiniferites,和钙质超微化石Micula concave,Arkangelskiella cymbiformis等,时代为Campanian—Maastrichtian期。

Abundant dinoflagellates, spores and pollen, calcareous nannopiankton and ostracods were found in Well K-l, Omni basin, Equatorial Guinea. Three assemblage zones were established. The assemblage zone A contained spores and pollen Classopollis-Cicatricosisporites Inaperturolollenites-Afropollis and ostracode Hourcqia and Petrobrasia, belonging to Aptian--Albian in age. The assemblage zone B contained spores and pollen Schizaeois- porites-Ephedripites-Jugella-T.ricolpites, dinoflagellate Oligosphaeridium, Dinogymnium, Impletosphaeridium, Florentinia and calcareous nannoplankton Eiffelithus eximius , Lithastrinus grillii and Eprolithus moratus , belong- ing to Cenomanian--Santonian in age. The assemblage zone C contained spores and pollen Polypodiaceae-Psophos- phaera-Proteacidites Tricolpopollenites, dinoflagellate Peridiniaceae, Dinogymnium, Tenua, Spini ferites and cal- careous nannoplankton Micula concave and Arkangelskiella cymbiformis, belonging to Campanian--Maastrichtian in age.