Cronobioestratigrafía del Mioceno tardío-Plioceno temprano, Puerta de Corral Quemado y Villavil, provincia de Catamarca, Argentina

GRACIELA ESTEBAN; NORMA NASIF; SERGIO GEORGIEFF

Acta Geologica Lilloana

Fundación Miguel Lillo

Lugar: San miguel de Tucumán; Año: 2014 vol. 26 p. 165 - 192

0567-7513

New records of Mylodontidae, Dasypodidae, Pampatheriidae (Xenarthra) andCaviomorpha (Hystricognathi, Rodentia) recovered from Chiquimil (El Jarillal Member) and Andalhuala Formations allocated in Puerta de Corral Quemado and Villavil areas, Catamarca Province, are presented. Radimetric and relative datings indicate ages between 8.7 Ma and 3.66 Ma. Three biostratigraphic units are proposed: 1) Proeuphractus limpidus ? Paleuphractus argentinus ? Chasicotatus ameghinoi Association Zone, Chiquimil Formation, El Jarillal Member (Late Tortonian ? Early Messinian, 8,7 ? 7,14 Ma); 2) Paraeuphractus prominens-Cardiomys ameghinorum ? Cardiatherium Association Zone, Lower two-thirds of Andalhuala Formation (Messinian, 7,14?5,64 Ma), 3) Vassallia maxima ? Pseudoplataeomys ? Pithanotomys Abundance Zone, Upper third of Andalhuala Formation (Late Messinian ? Zanclean, 5,64?3,66 Ma). This analysis not supports the validity of Macrochorobates scalabrinii Zone, proposed for the atlantic coast, as Lower Huayquerian and the Cyonasua brevirostris Zone as Montehermosean, in the Santa María and Hualfín-Belén valleys. It is established that the oldest record of Cyonasua comes from the highest levels in the Chiquimil Formation (El Jarillal Member), immediately below the tuff dated to 7,14 Ma. The environment proposed for El Jarillal Member (Chiquimil Formation) and lower levels of the Andalhuala Formations is savannalike, with small forests and a wet season with a progressive aridification toward the top of the Andalhuala Formation.