Devil's Postpile, a spectacular example of columnar basalt.  Once molten and under great pressure underground, the lava that makes up Devil's Postpile cooled evenly and slowly, contracting and fracturing into polygonal-sided columns.  The age of the formation is estimated between 100 and 700 thousand years old.  Sometime after the basalt columns formed, a glacier passed over the formation, cutting and polishing the tops of the columns.  The columns have from three to seven sides, varying because of differences in how quickly portions of the lava cooled, Devils Postpile National Monument, California
{"Image ImageDescription": "Devil's Postpile, a spectacular example of columnar basalt.  Once molten and under great pressure underground, the lava that makes up Devil's Postpile cooled evenly and slowly, contracting and fracturing into polygonal-sided columns.  The age of the formation is estimated between 100 and 700 thousand years old.  Sometime after the basalt columns formed, a glacier passed over the formation, cutting and polishing the tops of the columns.  The columns have from three to seven sides, varying because of differences in how quickly portions of the lava cooled.", "Image Orientation": "Horizontal (normal)", "Image XResolution": "72", "Image YResolution": "72", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "Adobe Photoshop Lightroom Classic 9.2 (Macintosh)", "Image DateTime": "2020:02:22 14:30:58", "Image Artist": "Phillip Colla", "Image Copyright": "\u00a9 Phillip Colla / OceanLight.com, all rights reserved worldwide", "Image ExifOffset": "860", "GPS GPSVersionID": "[2, 2, 0, 0]", "GPS GPSLatitudeRef": "N", "GPS GPSLatitude": "[37, 1873383/50000, 0]", "GPS GPSLongitudeRef": "W", "GPS GPSLongitude": "[119, 15993/3125, 0]", "GPS GPSAltitudeRef": "0", "GPS GPSAltitude": "291047/125", "Image GPSInfo": "974", "EXIF ExifVersion": "0231", "EXIF DateTimeOriginal": "2009:08:19 17:53:35", "EXIF DateTimeDigitized": "2009:08:19 17:53:35", "EXIF OffsetTime": "-08:00", "EXIF ColorSpace": "sRGB"}