Palaeobiogeography of the Holocene molluscan fauna from northeastern Buenos Aires Province, Argentina: its relation to coastal evolution and sea level changes

摘要: Abstract In northeastern Argentina the Holocene (ca. 2500–6000 14C yr B.P.) benthic marine molluscan fauna from Cerro de la Gloria Member of Las Escobas Formation represents a higher sea-level stand (approximately 4–5 m above m.s.1.) than present one and belongs to an original shallow water environment. Most this (48%) Argentine Zoogeographic Province while part it (12%) is shared with Magellanian Province. The rest taxa are cosmopolitan (5%) or belong Caribbean, Antillean Brazilian provinces (35%). latter considered stenothermic warm-water indicators which in shelf scarcer (6–14%), most them ranging Antilles southern Brazil Uruguay. It thermally anomalous consequence local coastal palaeogeography global mid-Holocene climatic change. On that basis sea-water temperature during mid inferred, probably due stronger influence Current could have extended farther south- westwards Hypsithermal. disagreement between data presented here micropalaeontological still problem be solved, likely through critical systematic revisions foraminiferids ostracods not included paper.