TY - JOUR N2 - A sequence of glacial deposits up to 4 m thick unconformably overlies the Eocene La Meseta Formation on the Seymour Island plateau (meseta) and forms a lithostratigraphically distinct unit in the succession of the James Ross Basin, which is formally named here as the Weddell Sea Formation. The formation is thus far known only from Seymour Island. This is a terrestrial melt-out till which contains abundant erratics and also reworked Cretaceous–Tertiary micro- and macrofossils within a silty clay matrix. The terrestrial origin of this till is shown by glacial striations at the base of the unit. The largest erratics (up to 3 m in diameter) are composed of plutonic (granitoids) and metamorphic (gneiss and crystalline schist) rocks of the Antarctic Peninsula provenance. Smaller in size and much more numerous are erratics of volcanic rocks, represented by andesite, basalt and corresponding pyroclastics of the James Ross Island Volcanic Group. Less common are erratics of sedimentary rocks, sometimes bearing fossils derived from the underlying Tertiary and Cretaceous strata. A few erratics from the top of the studied sequence are conglomerates of the Cockburn Island Formation with a foraminifer fauna. These are the youngest clasts within the Weddell Sea Formation. The presence of the Pliocene index fossil Ammoelphidiella antarctica Conato et Segre, 1974 indicates a lower age limit of latest Pliocene or earliest Pleistocene age. The upper age limit of the formation has not been established. An encrusting, unilamellar, colony of the bryozoan Escharella Gray, 1848 has been found on the one of erratics from the Weddell Sea Formation. This is the first fossil record of this genus in Antarctica. L1 - http://journals.pan.pl/Content/110655/PDF-MASTER/ppr25-189.pdf L2 - http://journals.pan.pl/Content/110655 PY - 2004 IS - No 3-4 EP - 204 KW - Antarctica KW - Seymour (Marambio) Island KW - post-Late Pliocene glacial strata (Weddell Sea Formation) KW - Bryozoa A1 - Gaździcki, Andrzej A1 - Tatur, Andrzej A1 - Hara, Urszula A1 - del Valle, Rodolfo A. PB - Polish Academy of Sciences PB - Committee on Polar Research VL - vol. 25 DA - 2004 T1 - The Weddell Sea Formation: post-Late Pliocene terrestrial glacial deposits on Seymour Island, Antarctic Peninsula SP - 189 UR - http://journals.pan.pl/dlibra/publication/edition/110655 T2 - Polish Polar Research ER -