- Lohan Cura Formation
The Lohan Cura Formation is a
geologic formation withoutcrop s in the Argentine provinces of Río Negro, Neuquén, and Mendoza. It is the second oldestCretaceous terrestrial formation in the Neuquén Basin.The Lohan Cura Formation unconformably overlies the terrestrial
La Amarga Formation . In some places it also overlies the older marine Agrio andBajada Colorada Formation s of theMendoza Group through the same unconformity. It is in turn overlain by theCandeleros Formation of theNeuquén Group , separated by another unconformity. The Lohan Cura correlates with theRayoso Formation in some areas.Age
Era:
Mesozoic
Period: EarlyCretaceous Faunal stage : lateAptian throughAlbian
Absolute Age: ~117 to ~100 myaComposition
The Lohan Cura Formation contains two members of roughly equal thickness.
The lower (and therefore older) of the two is the Puesto Quiroga Member, approximately 85
meter s thick. The lowest sediments in this formation are conglomerates, overlain bysandstone s andsiltstone s. The upper two-thirds of the member consists mainly ofshale s.The Cullín Grande Member is the upper member within the formation, about 92 meters thick, which contains numerous
stream channels in sandstone. By the top of the column, siltstones andclay stones become dominant.Paleontology
Numerous
tetrapod fossil s have been recovered from the Cullín Grande Member of the Lohan Cura, including:*several
turtle s (including 2 species of "Prochelidella ")
*rebbachisaurid sauropod s
*possibletitanosauria n sauropods (including "Agustinia " and "Ligabuesaurus ")The rebacchisaurid "
Rayososaurus " comes from the correlating Rayoso Formation in this same area.ee also
*
List of dinosaur-bearing rock formations References
*Leanza, H.A,, Apesteguia, S., Novas, F.E. & de la Fuente, M.S. 2004. Cretaceous terrestrial beds from the Neuquén Basin (Argentina) and their tetrapod assemblages. "Cretaceous Research". 25(1): 61-87.
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