UNA FAUNA LOCAL LUJANENSE (PLEISTOCENO SUPERIOR–HOLOCENO INFERIOR) DEL SUR DE URUGUAY: SANTA REGINA, DEPARTAMENTO DE COLONIA

DANIEL PEREA; ANA BADIN; ALDO MANZUETTI; FELIPE MONTENEGRO; EVA SILVA; ELOISA COCOREL; ANDRES BATISTA; ANDREA CORONA; MARIANO VERDE; MARTIN UBILLA

REVISTA BRASILEIRA DE PALEONTOLOGIA

SOC BRASILEIRA PALEONTOLOGIA

Lugar: Porto Alegre; Año: 2022

1519-7530

– A Lujanian Local Fauna (Upper Pleistocene–Lower Holocene) from southern Uruguay: Santa Regina, ColoniaDepartment. On the southwestern coast of Uruguay, in the Colonia and San José departments, sedimentary rocks that correspond to theNeogene and Quaternary are found. Herein we describe the fossiliferous locality of Santa Regina, located on the east coast of the departmentof Colonia. The stratigraphic profile shows at the base grayish-green sandy rocks belonging to the Camacho Formation (Upper Miocene).Overlying this unit, there is a tough yellowish-greenish siltstone in net contact, in which several pieces of a Notiomastodon platensis specimenwere found. Towards the upper part, a thicker greenish-brownish bed is observed, ranging upwards from conglomerates to siltstones. Thelower part of this bed includes disarticulated and fragmentary remains of Lestodon armatus, Glyptodon reticulatus, Pampatheriidae indet.,Toxodon cf. T. platensis, Morenelaphus sp., and Lycalopex gymnocercus, and to the top large portions of carapaces of Glyptodon sp.and Panochthus sp. The aforementioned mastofaunistic assemblage corresponds to the Lujanian Mammal Age or regional Stage (UpperPleistocene-Greenlandian). The lithostratigraphy allows us to refer the two upper levels to the Dolores Formation, a characteristic unit of theQuaternary of southern Uruguay, and not to the Raigón Formation, as indicated in some previous reports for this locality. The presence ofLestodon armatus, Glyptodon reticulatus, Notiomastodon platensis, Lycalopex gymnocercus, and the probable presence of Toxodon platensis,allow us to infer landscapes of open or semi-open areas, with a predominance of grasslands and shrubs during the genesis of the deposits.