page_title: Noreán Formation
hierarchical_section_title: Noreán Formation
caption_attribution_description: Quebrada
context_page_description: The Noreán Formation is a geological formation of the Eastern Ranges of the Colombian Andes, the Serranía de San Lucas and as basement underlying the southernmost Lower and northern Middle Magdalena Valleys. The formation consists of volcanic and pyroclastic lavas that range from andesites to rhyolites. Vitric, lithic and crystal tuffs and andesitic dikes and hypabyssal bodies are also present in the formation.
  The more than 2,000 metres thick formation was deposited in a continental arc magmatic setting in an Early Jurassic graben that presently forms the basement of the Middle Magdalena Valley. A positive anomaly of Pb suggests a subduction-related genesis dominated by explosive volcanism.
context_section_description: The Noreán Formation (Spanish: Formación Noreán, J1-2n, J1n) is a geological formation of the Eastern Ranges of the Colombian Andes, the Serranía de San Lucas and as basement underlying the southernmost Lower and northern Middle Magdalena Valleys. The formation consists of volcanic and pyroclastic lavas that range from andesites to rhyolites. Vitric, lithic and crystal tuffs and andesitic dikes and hypabyssal bodies are also present in the formation.
  The more than 2,000 metres (6,600 ft) thick formation was deposited in a continental arc magmatic setting in an Early Jurassic graben that presently forms the basement of the Middle Magdalena Valley (VMM). A positive anomaly of Pb suggests a subduction-related genesis dominated by explosive volcanism.
caption: Outcrop of the Effusive Rhyolitic Unit (Jner) south of Pailitas, Cesar[1]
exif: {"Image Make": "Apple", "Image Model": "iPhone 4", "Image Orientation": "Horizontal (normal)", "Image XResolution": "72", "Image YResolution": "72", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "5.1.1", "Image DateTime": "2012:09:20 12:15:40", "Image YCbCrPositioning": "Centered", "Image ExifOffset": "2288", "GPS GPSLatitudeRef": "N", "GPS GPSLatitude": "[8, 5061/100, 0]", "GPS GPSLongitudeRef": "W", "GPS GPSLongitude": "[73, 4023/100, 0]", "GPS GPSAltitudeRef": "0", "GPS GPSAltitude": "41534/585", "GPS GPSTimeStamp": "[17, 15, 1017/25]", "GPS GPSImgDirectionRef": "T", "GPS GPSImgDirection": "22778/219", "Image GPSInfo": "4752", "Image XPKeywords": "[102, 0, 105, 0, 110, 0, 99, 0, 97, 0, 32, 0, 115, 0, 101, 0, 112, 0, 116, 0, ... ]", "Image Padding": "[]", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "72", "Thumbnail YResolution": "72", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "5084", "Thumbnail JPEGInterchangeFormatLength": "6226", "EXIF ExposureTime": "1/1160", "EXIF FNumber": "14/5", "EXIF ExposureProgram": "Program Normal", "EXIF ISOSpeedRatings": "80", "EXIF ExifVersion": "0221", "EXIF DateTimeOriginal": "2012:09:20 12:15:40", "EXIF DateTimeDigitized": "2012:09:20 12:15:40", "EXIF ComponentsConfiguration": "YCbCr", "EXIF ShutterSpeedValue": "2769/272", "EXIF ApertureValue": "4281/1441", "EXIF BrightnessValue": "5767/622", "EXIF MeteringMode": "Pattern", "EXIF Flash": "Flash did not fire, auto mode", "EXIF FocalLength": "77/20", "EXIF SubjectArea": "[1295, 967, 699, 696]", "EXIF FlashPixVersion": "0100", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "2592", "EXIF ExifImageLength": "1936", "EXIF SensingMethod": "One-chip color area", "EXIF ExposureMode": "Auto Exposure", "EXIF WhiteBalance": "Auto", "EXIF SceneCaptureType": "Standard", "EXIF Sharpness": "Hard", "EXIF Padding": "[]"}