page_title: Keystone (limestone)
hierarchical_section_title: Keystone (limestone)
caption_attribution_description: English: Photograph of cut slab of keystone at the Hurricane Monument in the Florida Keys. Lenscap 5.8 cm diameter. Taken by Jim Stuby (talk) 04:07, 22 March 2008 (UTC)
context_page_description: Keystone is a type of limestone, or coral rag, quarried in the Florida Keys, in particular from Windley Key fossil quarry, which is now a State Park of Florida. The limestone is Pleistocene in age, and the rock primarily consists of scleractinian coral, such as Elkhorn coral and Brain coral.
  The Hurricane Monument, commemorating victims of the Labor Day Hurricane of 1935, and located at mile marker 82 on U.S. Route 1 near Islamorada, is constructed of keystone, as is the David W. Dyer Federal Building and United States Courthouse.
context_section_description: Keystone is a type of limestone, or coral rag, quarried in the Florida Keys, in particular from Windley Key fossil quarry, which is now a State Park of Florida.  The limestone is Pleistocene in age, and the rock primarily consists of scleractinian coral, such as Elkhorn coral and Brain coral.
  The Hurricane Monument, commemorating victims of the Labor Day Hurricane of 1935, and located at mile marker 82 on U.S. Route 1 near Islamorada, is constructed of keystone, as is the David W. Dyer Federal Building and United States Courthouse.
caption: Example of keystone at the Hurricane Monument.
exif: {"Image Make": "Canon", "Image Model": "Canon EOS DIGITAL REBEL", "Image Orientation": "Horizontal (normal)", "Image XResolution": "180", "Image YResolution": "180", "Image ResolutionUnit": "Pixels/Inch", "Image DateTime": "2008:03:22 00:00:47", "Image YCbCrPositioning": "Centered", "Image Software": "Adobe Photoshop CS Windows", "Image ExifOffset": "324", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "72", "Thumbnail YResolution": "72", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "1226", "Thumbnail JPEGInterchangeFormatLength": "6420", "EXIF ExposureTime": "1/80", "EXIF FNumber": "71/10", "EXIF ISOSpeedRatings": "100", "EXIF ExifVersion": "0220", "EXIF DateTimeOriginal": "2008:03:09 19:32:57", "EXIF DateTimeDigitized": "2008:03:09 19:32:57", "EXIF ComponentsConfiguration": "YCbCr", "EXIF CompressedBitsPerPixel": "3", "EXIF ShutterSpeedValue": "207157/32768", "EXIF ApertureValue": "46331/8192", "EXIF ExposureBiasValue": "0", "EXIF MaxApertureValue": "162885/32768", "EXIF MeteringMode": "Pattern", "EXIF Flash": "Flash did not fire, auto mode", "EXIF FocalLength": "46", "EXIF FlashPixVersion": "0100", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "819", "EXIF ExifImageLength": "544", "Interoperability InteroperabilityIndex": "R98", "Interoperability InteroperabilityVersion": "[48, 49, 48, 48]", "Interoperability RelatedImageWidth": "2048", "Interoperability RelatedImageLength": "1360", "EXIF InteroperabilityOffset": "1076", "EXIF FocalPlaneXResolution": "512000/223", "EXIF FocalPlaneYResolution": "16000/7", "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"}