EEMB 136L Lecture Notes - Lecture 1: Microcrystalline, Ripple Marks, Sedimentary Structures
15 Nov 2017
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Document Summary
Plutonic (intrusive) rocks that cooled below the earth"s surface. Volcanic (extrusive) rocks that formed at the earth"s surface. Rocks that have been altered due to heat, pressure, or other factors, and transformed into a different kind of rock. Formed of portions of previously existing rock(clastic) or by chemical precipitation(chemical) Composed of wide variety of mineral types and grain sizes. When the particle size changes gradually in a vertical direction. Largest particles settle out 1st followed by successively smaller particles. Wavy undulations on a sediment surface formed as water or wind moves across it. Secondary layering which occurs at an angle to the primary bedding orientation. Thin layers parallel to the bedding formed by the settling of fine- grained sediment. Concave upward structures that truncate layers at their margins. Usually formed with thicker particles than the surrounding material. Polygonal patterns of cracks that form on the surface of wet mud when it dries out.
