FORAMINIFEROS DEL CRETACICO SUPERIOR Y TERCIARIO DEL SUBSUELO DE LA PROVINCIA SANTA CRUZ, ARGENTINA

摘要: The paper contains the study of S.C.3 well foraminifera, center-south Santa Cruz province, Argentina. Fifty-six foraminiferal specia are determined, and fortyfour described illustrated, with a lithological description samples that contain them, followed by brief review cf micropaleontological stratigraphical knowledges Cuenca Austral. presence Cenomanian based on planctonic foraminifera Globigerinelloides ben- tonensis (Morrow) Globigerina washitensis Carsey, was determined. hiatus probably goes from Upper to Lower Santonian is verified. It had been noted already Leanza (1963) surface at Ultima Esperanza region, in Chile, arnmonites. microfauna Campanian-Lower Maestrichtian illustrated; it characterized Gyroidinoides globosa (Hagenow) varo orbicella Bandy, Praebulimina kicleapoensis (Cole l, Cyclammina sp. Allomorphina paleocenica Cushman Piramidina minima (Brotzen ): age assigned this fauna Heterohelix punctulata (Cushman) association Eubaculites? A Eocene presents affinity one Agua Fresca forma- tion (Todd K.niker, 1952) by. Cyclamina cancellata (Brady ), Heterolepa haidingeri (d'Orb.), Cassidulina crassa d'Orb., Trochamina? sp., Gyroi- dinoides soldanii, Quinqueloculina imperialis Hanna Harina, corresponding ecologically normal salinity environment, cold waters deepness no more than 200 m. also Miocene which officinalis Subbotina, indicates -since seems marine Oligocene absent country (Carnacho, 1966)- ingression south begun Aquitanian. studied belong tO shallow water environment cha- racterized Porosorotalia ornata results its pre.sence recent sediments due rework, other nowadays live present patagonian coasts.