page_title: Roca Formation, Argentina
section_title: Fossil content
hierarchical_section_title: Roca Formation, Argentina / Fossil content
caption_attribution_description: Español: El estrato que sobresale constituye la base de la Formación Roca (Daniano) en la localidad Cañadón Cholino, General Roca, Río Negro, Patagonia Argentina English: The pale bed constitutes the base of the Roca Formation (Danian) in Cañadón Cholini, General Roca, Río Negro, Patagonia, 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 first section of the Roca Formation has abundant fossiliferous content, including bivalves, gastropods, bryozoans, echinoderms, crustaceans, ostracods, foraminifera, and calcareous nanoplankton, as well as remains of fish.
caption: Limestones in Roca Formation, Cantera Cholino, General Roca, Río Negro
exif: {"Image Make": "Canon", "Image Model": "Canon EOS REBEL T3i", "Image Orientation": "Horizontal (normal)", "Image XResolution": "72", "Image YResolution": "72", "Image ResolutionUnit": "Pixels/Inch", "Image DateTime": "2014:04:12 15:42:07", "Image Artist": "", "Image YCbCrPositioning": "Co-sited", "Image Copyright": "", "Image ExifOffset": "348", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "72", "Thumbnail YResolution": "72", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "8916", "Thumbnail JPEGInterchangeFormatLength": "16560", "EXIF ExposureTime": "1/320", "EXIF FNumber": "71/10", "EXIF ExposureProgram": "Program Normal", "EXIF ISOSpeedRatings": "100", "EXIF SensitivityType": "Recommended Exposure Index", "EXIF RecommendedExposureIndex": "100", "EXIF ExifVersion": "0230", "EXIF DateTimeOriginal": "2014:04:12 15:42:07", "EXIF DateTimeDigitized": "2014:04:12 15:42:07", "EXIF ComponentsConfiguration": "YCbCr", "EXIF ShutterSpeedValue": "67/8", "EXIF ApertureValue": "45/8", "EXIF ExposureBiasValue": "0", "EXIF MeteringMode": "Pattern", "EXIF Flash": "Flash did not fire, compulsory flash mode", "EXIF FocalLength": "100", "EXIF SubSecTime": "00", "EXIF SubSecTimeOriginal": "00", "EXIF SubSecTimeDigitized": "00", "EXIF FlashPixVersion": "0100", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "3456", "EXIF ExifImageLength": "2304", "Interoperability InteroperabilityIndex": "R98", "Interoperability InteroperabilityVersion": "[48, 49, 48, 48]", "EXIF InteroperabilityOffset": "8598", "EXIF FocalPlaneXResolution": "691200/181", "EXIF FocalPlaneYResolution": "460800/119", "EXIF FocalPlaneResolutionUnit": "2", "EXIF CustomRendered": "Normal", "EXIF ExposureMode": "Auto Exposure", "EXIF WhiteBalance": "Auto", "EXIF SceneCaptureType": "Standard", "EXIF CameraOwnerName": "", "EXIF BodySerialNumber": "332076194510", "EXIF LensSpecification": "[75, 300, 0/0, 0/0]", "EXIF LensModel": "EF75-300mm f/4-5.6", "EXIF LensSerialNumber": "0000000000"}