page_title: Basement (geology)
hierarchical_section_title: Basement (geology)
caption_attribution_description: English: Gneiss outcrop, w:South Rona off w:Raasay. The island of Rona consists of ancient Lewissian gneiss, among the oldest rocks in Europe..
context_page_description: In geology, basement and crystalline basement are the rocks below a sedimentary platform or cover, or more generally any rock below sedimentary rocks or sedimentary basins that are metamorphic or igneous in origin. In the same way, the sediments or sedimentary rocks on top of the basement can be called a "cover" or "sedimentary cover".
context_section_description: In geology, basement and crystalline basement are the rocks below a sedimentary platform or cover, or more generally any rock below sedimentary rocks or sedimentary basins that are metamorphic or igneous in origin. In the same way, the sediments or sedimentary rocks on top of the basement can be called a "cover" or "sedimentary cover".
caption: Gneiss outcrop, basement rock, Scotland
exif: {"Image Make": "Canon", "Image Model": "Canon EOS 300D DIGITAL", "Image Orientation": "Horizontal (normal)", "Image XResolution": "180", "Image YResolution": "180", "Image ResolutionUnit": "Pixels/Inch", "Image DateTime": "2006:08:25 19:22:11", "Image YCbCrPositioning": "Centered", "Image ExifOffset": "188", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "180", "Thumbnail YResolution": "180", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "1105", "Thumbnail JPEGInterchangeFormatLength": "7786", "Thumbnail YCbCrPositioning": "Co-sited", "EXIF ExposureTime": "1/30", "EXIF FNumber": "7/2", "EXIF ISOSpeedRatings": "200", "EXIF ExifVersion": "0221", "EXIF DateTimeOriginal": "2006:08:25 19:22:11", "EXIF DateTimeDigitized": "2006:08:25 19:22:11", "EXIF ComponentsConfiguration": "YCbCr", "EXIF CompressedBitsPerPixel": "3", "EXIF ShutterSpeedValue": "160789/32768", "EXIF ApertureValue": "118447/32768", "EXIF ExposureBiasValue": "0", "EXIF MaxApertureValue": "118447/32768", "EXIF MeteringMode": "Pattern", "EXIF Flash": "Flash did not fire, compulsory flash mode", "EXIF FocalLength": "18", "EXIF FlashPixVersion": "0100", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "640", "EXIF ExifImageLength": "427", "Interoperability InteroperabilityIndex": "R98", "Interoperability InteroperabilityVersion": "[48, 49, 48, 48]", "Interoperability RelatedImageWidth": "3072", "Interoperability RelatedImageLength": "2048", "EXIF InteroperabilityOffset": "940", "EXIF FocalPlaneXResolution": "768000/223", "EXIF FocalPlaneYResolution": "409600/119", "EXIF FocalPlaneResolutionUnit": "2", "EXIF SensingMethod": "One-chip color area", "EXIF FileSource": "Digital Camera", "EXIF CustomRendered": "Normal", "EXIF ExposureMode": "Auto Exposure", "EXIF WhiteBalance": "Auto", "EXIF SceneCaptureType": "Standard"}