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Sand Spheres Are Usually Ooids Made by Microbes.

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Last updated on Sept. 5, 2016
Sand spheres are usually ooids. Evidence: this webpage  shows that only ooid sand contain spheres among all kinds of sand. Moqui marbles and Martian blueberries are much larger than 0.5-mm ooids. Ooids show many different colors, but moqui marbles and Martian blueberries do not. Ooids contain nucleus, but most moqui marbles and Martian blueberries do not. The above-mentioned evidence is elaborated in 

http://wretchfossil.blogspot.tw/p/putative-martian-microbes-formed.html

Ooids are formed by microbes. Evidences:
2. Figure 1: Ooids Form in Dense Concentration.
On March 10, 2016 (Sol 1278), NASA’s Mars rover Curiosity acquired the above microscopic image near Naukluft Plateau, Gale Crater, Mars. Ten red arrows point to less-eroded ooids. These ooids are smaller than 1 mm across. Note the density of the spheres and the spheroidal particles. If they were formed by geological process, what geological process concentrated them here?  Geological processes, such as wind or water transportation, disperse rather than concentrate such particles. The spheres and spheroidal particles are ooids, which usually form in dense concentrations. 
Image source: mars.nasa.gov/msl/multimedia/raw/?rawid=1278MH00058400004… 
3. Figure 2: Sand Spheres Do Not Result from Abrasion.

NASA’s description: http://mars.jpl.nasa.gov/msl/multimedia/images/?ImageID=7314
In NASA’s description, the spheres resulted from abrasion during transportation.The explanation comes from no physical evidence. Above photo shows concentration of spherical and spheroidal ooids. Wind or water does not concentrate such particles. 

In view of the above, sand spheres are usually ooids made by microbes. 

Note 1: Oncoids are similar to ooids, but much larger. Oncoids are formed by microbes, too, according to Wikipedia article https://en.wikipedia.org/wiki/Oncolite .

See also: Introduction to oncoids and pisolite: 

 

 

 

 



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