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{"Image DocumentName": "I. Principles of Relative Dating", "Image ImageDescription": "Long before radiometric dating was possible, important principles of relative ages of rock units were established. I. Principle of original horizontality: Because sedimentary particles settle under the influence of gravity, sedimentary layers of rock are deposited horizontally. Sedimentary rock layers that are not horizontal have been folded or tilted by a tectonic event. Deposition of the sedimentary rocks predates the tectonic event.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}