Abstract

This work documents the biostratigraphy of dinoflagellate cysts from the La Barca Formation at the Punta Ainol Locality, Tierra del Fuego Province, Argentina. The succession at Punta Ainol represents a new record for the Paleogene (late Paleocene–middle Eocene) from southern South America, based on current data on nannofossils and dinoflagellate cysts. Some significant events are in agreement with nannofossil data. In ascending stratigraphic order, they include the first occurrences (FOs) of Impagidinium crassimuratum, Apectodinium homomorphum, Pyxidiniopsis waipawaensis, Samlandia septata, Cleistosphaeridium diversispinosum, and Enneadocysta dictyostila, and the latest occurrence (LO) of Palaeocystodinium golzowense. Three Paleocene/Eocene dinoflagellate cyst zones (Palaeocystodinium golzowense, NZDP7 and Apectodinium homomorphum) are recognized here.

摘要

这项工作记录了阿根廷火地岛省 Punta Ainol 地区 La Barca 组的甲藻囊肿的生物地层学。根据目前有关纳米化石和甲藻囊肿的数据，Punta Ainol 的演替代表了南美洲南部古近纪（晚古新世-中始新世）的新记录。一些重大事件与纳米化石数据一致。在地层升序中，它们包括首次出现 ( FO ) 的Impagidinium crassimuratum、Apetodinium homomorphum、Pyxidiniopsis waipawaensis、Samlandia septata、Cleistosphaeridium diversispinosum和Enneadocysta dictyostila，以及Palaeocystodinium golzowense的最新出现 (LO) 。三个古新世/始新世甲藻囊肿区（Palaeocystodinium golzowense、NZDP7 和Apetodinium homomorphum）在这里被识别。