GLGY 209 Lecture Notes - Lecture 14: Erosion Surface, Unconformity, Ripple Marks
31 May 2016
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Document Summary
States that younger features or rock cut across older features or rocks. Prominently used in characterizing veins, dykes in igneous rocks. Younger features cut across older features or rocks. An igneous body that thermally alters a body of rock is younger that the altered rock. Thermally altered rock are older than the source of alteration. Structures due to sedimentary processes with consistent upward or downward orientation. Sedimentary structures in fine sediments that opens upwards (layer top) and narrows downwards (layer bottom) to indicate the top and bottom direction in a layer. Structures produced by organisms in sediments in the course of their life activities. The burrows as a rule opens toward the top of a layer and closes to the bottom of a layer. Sedimentary structures formed as a result od current action on unconsolidated particles at the top of a layer.
