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Re: Age of La Colonia



> Is the La Colonia Formation of Argentina Albian/Aptian of Maastrichtian?

Taken from http://dml.cmnh.org/2003Sep/msg00120.html (see references
therein):

The Bayo Overo Member [of Cerro Barcino Formation] has yielded the sauropod
Chubutisaurus (Del Corro, 1975), an undescribed sauropod, and several
theropod teeth ( Rich et al., 2000). Though frequently cited as being
derived from the Aptian?Albian (e.g. Weishampel, 1990; Bonaparte, 1996;
Novas, 1997) Chubutisaurus is thus most probably of Late Cretaceous age
(Page et al., 1999; Rich et al., 2000). Likewise, the abelisaurid
Carnotaurus, originally thought to be from the Albian of the Cerro Barcino
(=Gorro Frigio) Formation (Bonaparte, 1985; Bonaparte et al., 1990), is now
known to have come from the La Colonia Formation, which, according to new
palynological evidence, is Maastrichtian in age (A. Archangelsky, pers.
comm. 2001). Likewise, the abelisaurid Carnotaurus, originally thought to be
from the Albian of the Cerro Barcino (=Gorro Frigio) Formation (Bonaparte,
1985; Bonaparte et al., 1990), is now known to have come from the La Colonia
Formation, which, according to new palynological evidence, is Maastrichtian
in age (A. Archangelsky, pers. comm. 2001).

Hope this helps.

Matías Soto