LIVINGSTONITES GABRIELAE GEN. ET SP. NOV., PERMINERALIZED MOSS (BRYOPHYTA:BRYOPSIDA) FROM THE APTIAN CERRO NEGRO FORMATION OF LIVINGSTON ISLAND (SOUTH SHETLAND ISLANDS, ANTARCTICA)

摘要

THE Cerro Negro Formation is a non-marine succession that outcrops in Byers Peninsula (Livingston Island) and Williams Point (Snow Island). Both islands belong to the South Shetland Islands Archipelago, Antarctica. ~(40)Ar/~(39)Ar age of the Cerro Negro Formation was estimated at 120.3 ±2.2 Ma, 119.4±0.6 Ma and 119.1±0.8 Ma (Aptian) (Hathway, 1997; Hathway et al., 1999). A highly diverse palaeoflora, containing mosses, liverworts, hepatophytes, horse-tails, ferns, corystosperms, Caytoniales, bennettites, cycads, and conifers was recorded by several authors from the unit (Hernandez and Azcarate, 1971; Torres a al, 1997; Cesari a 4, 1998, 1999, 2001; Cantrill, 2000; Falcon-Lang and Cantrill, 2001; Cesari 2006; Parica et at, 2007; Vera, 2007, 2009; among others).