EAPS 11200 Lecture 5: 01232019 day 1

• School: Purdue University
• Department: Earth Atmospheric and Planetary Sciences
• Course: EAPS 11200
• Professor: Terry West

Document Summary

Sedimentary rocks: all start as unconsolidated particles, undergo lithification, two main types, siliciclastic, chemical. Lithification: compaction and cementation of grains to form a sedimentary rock. Classifying siliciclastic rocks: composition, grain size, sorting, degree of roundness. Chemical rocks: minerals derived from materials in solution, chemical processes (inorganic, organism (skeletal debris) Carbonate rocks: limestone calcite precipitated chemically or (most commonly) by organisms, chalk soft limestone (tiny calcite plates from marine microorganisms coccoliths, dolostone dolomite usually altered from limestone. Inorganic (mostly) chemical precipitation: roc salt and gypsum, chert fine grained silica (chemical or biological, coal altered plat remains from swamps. James hutton: process that have occurred in the past are the same or similar to those occurring presently, often paraphrased: the present is the key to the past . 3 principals of stratigraphy: nicolaus steno (1638 1687) Importance of stratification or horizontal layering: stratification of sediment occurs as a result of differences in particle size and density.