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April 24, 2016 Weekly Geology Guess

April 24, 2016
Greetings from the Bluff Park   Porch, way up yonder on Shades Mountain (1,109′) in Alabama:
With my discussion on Alabama Geology, I have gotten the geologic cart before the horse.  I have not included a basic discussion regarding rocks and all the various kinds of sedimentary, metamorphic, and igneous rocks.
We will continue with Sedimentary Rocks.
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Minerals and Rocks – The Good Life from the Ground
 
“If it ain’t grown, it has to be mined”
Sedimentary Rocks

>    This is one of the best and simple explanations of Sedimentary Rocks.


“Clastic sedimentary rocks such as breccia, conglomerate, sandstone, siltstone, and shale are formed from mechanical weathering debris.”
for this week.
“Chemical sedimentary rocks, such as rock salt, iron ore, chert, flint, some dolomites, and some limestones, form when dissolved materials precipitate from solution.”
In Alabama we have salt domes in South Alabama in the Coastal Plain.  Iron ore as magnetite is located in the Alabama Piedmont, hematite in the Red Mountain Formation that put Birmingham on the map, and limonite in all of the Alabama Physiographic Provinces.  Chert and Flint is found in the Highland Rim and Valley and Ridge Provinces.  Limestones and dolomites are found in both the Highland Rim and Valley and Ridge Provinces.
Note:  Flint is a variety of chert and is darker in color.
“Organic sedimentary rocks such as coal, some dolomites, and some limestones, form from the accumulation of plant or animal debris.”
Attached is a handy guide to rocks by the USGS (US Geological Survey).  Simple in terms of Petrology, but still detailed.  R

http://geology.about.com/od/rocks/a/Rock-Tables.htm?utm_source=facebook&utm_medium=social&utm_campaign=shareurlbuttons

Thanks,
Randy


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Another Editors Note:  It is the intent of this site to keep this discussion as simple as possible, so as to educate the interested general public and not to discuss with the geology crowd the latest geologic theories and nuances.  Thanks, R
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“No copyright infringement intended.
The rights belong to their respective owners”
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Copyright Disclaimer: Under Section 107 of the Copyright Act 1976, allowance is made for “fair use” for purposes such as criticism, comment, news reporting, teaching, scholarship, and research. Fair use is a use permitted by copyright statute that might otherwise be infringing. Non-profit, educational or personal use tips the balance in favor of fair use.

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Author’s Request:  If you see any pictures that you know the source and photographer, let me know immediately.  Thanks!  R

Images have been searched by TinEye Reverse Image Search.  http://tineye.com/

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Next week we will cover the “Organic Sedimentary Rocks”  Note, at times limestones and dolomites are a blend of chemical and organic deposition.  We will discuss coal, limestone, and dolomite next week.  Thanks, R
 
 
Have A Great Week!
Randy/Randall
AL.  Highland Rim. Chert Pit. unknown

AL. Highland Rim. Chert Pit. unknown

AL-HR.  Ft. Payne Chert.  Flint Drill. unknown

AL-HR. Ft. Payne Chert. Flint Drill. unknown

Flint and Chert Arrohead. rocksforfun.com. by Doon McClellan

Flint and Chert Arrohead. rocksforfun.com. by Don McClellan

Halite Crystal.  National Mineral Gallery.  geogallery.si.edu

Halite Crystal. National Mineral Gallery. geogallery.si.edu

Halite, Blue Crystal.. Intrepid Potash East Mine, Carsbad, NM.  cr Spirifer Minerals

Halite, Blue Crystal.. Intrepid Potash East Mine, Carsbad, NM. cr Spirifer Minerals

Halite, Pink Hoppered Crystals. Searles Lake, Trona, San Bernadino Co., CA.  cr John Veevaert

Halite, Pink Hoppered Crystals. Searles Lake, Trona, San Bernadino Co., CA. cr John Veevaert

Hematite, Red Mt. Iron Ore.  Birmingham, AL.  edificerex.blogspot.com.  edifice rex

Hematite, Red Mt. Iron Ore. Birmingham, AL. edificerex.blogspot.com. edifice rex

Magnetite - lodestone,  earthscienceteamperiod7.wikispaces.com

Magnetite – lodestone, earthscienceteamperiod7.wikispaces.com

Magnetite.  Bolivia. cr Rob Lavinski, iRocks.com

Magnetite. Bolivia. cr Rob Lavinski, iRocks.com

Red Mountain Expressway Cut.  Hematite.  01-04-2011. Grreg Willis

Red Mountain Expressway Cut. Hematite. 01-04-2011. Greg Willis

Sedimentary.  Fold Halite in Salt Mine, Sicily.  Messinian Salinity Crisis.  Geology of the world and the environment

Sedimentary. Folded Halite in Salt Mine, Sicily. Messinian Salinity Crisis. Geology of the world and the environment

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