Cretaceous paleogeography and depositional cycles of western South America

Episodicity of Mesozoic terrane accretion along the Pacific margin of Gondwana: implications for superplume-plate interactions

“…Dalziel (1986) western South America in mid-Aptian and Aptian-Albian times (Macellari 1988). An unconformity related to one of these hiatuses cuts felsic tuff, dated at ~104 Ma, in the Andes of central Chile (Charrier et al 1996).…”

First fission-track age for the dinosaur-bearing Neuquén Group (Upper Cretaceous), Neuquén Basin, Argentina.

“…The Ncuquen Group (Stipanicic et al, 1968) in this region lies between the Bajada del Agrio and Malargue Groups, and is bounded by two major regional surfaces recognized as seismic reileclor horizons: the iVain Miranican (Aibian/Cenornanian boundary) and the Hiiar~traiquican (MidCampanian) unconibrmit,ies (see 12amos;1981, Macellari, 1988, Vergani el al., 1995, Leanza, 1999. It consists of continental red beds up to 1,300 m in thickness (Cazau & IJliana, 1973), ii~cluding conglomerates, sandstones, a n d mudrocks, dominantly deposited under alluvial processes (Legarreta & Uliana, 1998 Dinosaur remains discovered in this unit were found in different fbssii spots located in a wide area around the Limay River, in t h e border between Neuqubn and Rio Negro Provinces.…”

Phylogeny of the Neotropical Killifish Family Rivulidae (Cyprinodontiformes, Aplocheiloidei) Inferred from Mitochondrial DNA Sequences

“…If this was the case, it would indicate that there was reduced habitat prior to this event. It is well documented that global sea levels were at a high during the Late Cretaceous approximately 88-100 MYA (Haq et al, 1987) and probably would have flooded up to 80% or more of northern South America (Macellari, 1988). The Guyanan massifs would have been relatively unscathed, and it may have been this structure which isolated the ancestors of the current Guyana Shield fauna.…”