page_title: Roca Formation, Argentina
hierarchical_section_title: Roca Formation, Argentina
caption_attribution_description: Español: Horno de cal en la Localidad de Barda Norte, General Roca, Río Negro, Argentina
context_page_description: The Roca Formation is a Cretaceous to Paleogene lithostratigraphic unit, located in the Neuquén Basin. It crops out in the Argentinian provinces of Río Negro, Neuquén, La Pampa, and Mendoza. Its deposition is diachronous, beginning during the Maastrichtian in the north of its distribution, and later moving to the south, where its strata reached the Late Danian. It lies transitionally above the Jagüel Formation, and the top of the formation is marked by a regional unconformity due to an Eocene and Oligocene orogenic pulse. These two units belong to the Malargüe Group. The marine sediments of the Jagüel and Roca Formations were deposited during a transgression from the Atlantic Ocean, beginning in the Maastrichtian and ending in the Danian.
  The stratotype of the Roca Formation is located 12 kilometres north of General Roca, Río Negro. The fossiliferous beds of the Roca Formation were discovered by G. Rohde Windhausen, who was also the first author to describe these sediments. Schiller took samples of one section along the Zanjón Roca, from the northern part of General Roca to Horno de Cal.
context_section_description: The Roca Formation is a Cretaceous to Paleogene lithostratigraphic unit, located in the Neuquén Basin. It crops out in the Argentinian provinces of Río Negro, Neuquén, La Pampa, and Mendoza. Its deposition is diachronous, beginning during the Maastrichtian in the north of its distribution, and later moving to the south, where its strata reached the Late Danian. It lies transitionally above the Jagüel Formation, and the top of the formation is marked by a regional unconformity due to an Eocene and Oligocene orogenic pulse. These two units belong to the Malargüe Group. The marine sediments of the Jagüel and Roca Formations were deposited during a transgression  from the Atlantic Ocean, beginning in the Maastrichtian and ending in the Danian.
  The stratotype of the Roca Formation is located 12 kilometres (7.5 mi) north of General Roca, Río Negro (39º40´S, 67º32´W). The fossiliferous beds of the Roca Formation were discovered by G. Rohde Windhausen  (1914), who was also the first author to describe these sediments. Schiller (1922) took samples of one section along the Zanjón Roca, from the northern part of General Roca to Horno de Cal (lime kiln). This author proposed to name the lime kiln as the "classic area", and the westward cliffs from the lime kiln as the "model area" of these beds. The lithological composition of this type locality contains gray-yellowish and highly fossiliferous limestones, with greenish claystones and marls, and abundant gypsum at the top. The basal and middle sections are approximately 26 metres (85 ft) thick (Weber, 1972).
caption: Lime kiln in Barda Norte Locality, General Roca, Río Negro, Argentina
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