Tulane Physical Geology Laboratory -INSTRUCTOR: E. GONZALEZ
Last Updated September 14, 2003
SEDIMENTARY ROCKS -OUTLINE
Laboratory
Manual in Physical Geology by The American Geological Institute (AGI) and the National
Association of Geoscience Teachers (NAGT); Richard M. Busch, Editor; 6th
Edition, 2003.
SEDIMENTS
ORIGINAL SOURCE
WEATHERING
(Chemical and physical (mechanical))
SEDIMENTARY ROCKS
-CLASTIC
GRAIN SHAPE
DEGREE
OF ROUNDNESS (rounded to angular)
GRAIN SIZE (gravel, sand, silt, clay)
DEGREE OF SORTING (well sorted to poorly sorted)
-CRYSTALLINE
or MICROCRYSTALLINE
COMPOSITION
BIOCHEMICAL
(ORGANIC)
CHEMICAL
DETRITAL
(CLASTIC)
SEDIMENTARY
ROCK PROCESSES
COMPACTATION
CEMENTATION
PRECIPITATION
SEDIMENTARY ROCK CLASSIFICATION (based on texture and mineral composition; Figure 6.8, p. 101)
DETRITAL (CLASTIC |
BIOCHEMICAL |
CHEMICAL |
Stratification (lamination or bed) |
Ripple marks |
Raindrop impressions |
Cross-stratification or Cross-bedding |
Flutes |
|
Graded Bedding |
Mudcracks |
|
Sedimentary Environments (Characteristic sediments, structures, and fossils; Figure 6.12, pp. 108-109)