The Plottier Formation is a geologic formation that outcrops in the Argentine Patagonian provinces of Río Negro and Neuquén . It is the younger of two formations belonging to the Río Neuquén Subgroup within the Neuquén Group of the Neuquén Basin , with the oldest rocks dating from the late Coniacian and its youngest maybe from the very start of the Santonian . Formerly, that subgroup was treated as a formation, and the Plottier Formation was known as the Plottier Member .
6-399: [REDACTED] Río Neuquén Subgroup Plottier Formation Portezuelo Formation The Neuquén Group is a group of geologic formations found in Argentina . Rocks in the Neuquén Group fall within the Cenomanian to early Campanian stages of the Late Cretaceous Period. It overlies the older Lohan Cura Formation and is itself overlain by the younger Allen Formation of
12-474: Is differentiated from the underlying Portezuelo Formation primarily by its higher content of argillites (mud deposits) and was deposited under fluvial conditions. In 2006, a detailed lithostratigraphic and paleoecological study of a section of the Plottier Formation was published. This section contained alluvial deposits laid down by what was essentially a low-gradient wandering river throughout
18-571: The Malargüe Group , separated from both by unconformities , dated to 98 and 79 Ma respectively. Deposits have been located in the provinces of Río Negro , Neuquén , and Mendoza . Although several different types of environments are represented in various sections of the Neuquén Group, the dominant regime is alluvial deposition. Many dinosaur and other fossil types have been discovered in these sediments. There are seven formations within
24-657: The Neuquén City airport , north of the town of Plottier , is the type locality of the Plottier Formation. At its base, this formation grades into the Portezuelo Formation , and it is in turn overlain conformably by the Bajo de la Carpa Formation , a unit of the Río Colorado Subgroup. The Plottier Formation is the thinnest formation within the Neuquén Group, with a maximum thickness of only 25 metres (82 ft). It
30-494: The Neuquén Group. These are divided into three subgroups named after major rivers in the area. In some works, the subgroups themselves are treated as formations and what usually is considered to be the formations as mere members of these. However, particularly in the Río Limay Subgroup, the formations are clearly composed of very distinct rock layers. Neuquén Group strata, ordered from youngest to oldest South of Añelo , on
36-594: The road between Lake Los Barreales and the Neuquén River are views on the successively younger formations, starting with the Lisandro Formation to the northwest of Lake Los Barreales, and finally crossing the Anacleto Formation about 35 kilometres (22 mi) down the road near the eastern tip of the lake. The older strata are exposed south of Lake Los Barreales. Plottier Formation A section near
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