clasts

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Oops, it’s been a week since I don’t draw pages… I’m not satisfied with this x’D

Regardless… the story must go on!!


I have a gif for next update, but Tumblr is mean with me, so I hope it turns out right… :c


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Last updated: March 1, 2017

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Atlantic waves crashing on a black sand beach filled with rounded clasts of basaltic rock, Iceland.

4

Ooids • Sedimentary Spheres

While these dark gray spherical clasts could be mistaken for some type of fossil, they’re actually ooids, which are chemically precipitated sedimentary grains.

Ooids form around a nucleus of a mineral grain or shell fragment. Concentric layers composed of calcium carbonate precipitate out and progressively coat the nucleus, forming a pattern almost like tree rings. In the bottom right photo, you can clearly see the center nucleus and the individual surrounding concentric layers that compose the ooid.

Generally, ooids form in shallow wave-agitated water. These higher-energy marine settings allow for accretion to occur on all sides of the grain and for their well-polished appearance. However, ooids are also known to form in non-marine settings, such as the Great Salt Lake.

Grains that are less than 2 mm in diameter are termed ooids, while those larger than 2 mm are termed pisoids. Accordingly, ooids cemented together form the sedimentary rock oolite, and pisoids form the rock pisolite.


Specimens of unknown age from Banff, Alberta, Canada

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As we step out from behind the wall…the Misti Volcano appears. This is the kind of landscape you find in a volcanic arc - cities right up against looming cones. Betting there’s some ash component to the blocks in the wall we see at the beginning - look at the open holes and the angular clasts, looks a lot like a rock erupted explosively by a volcano to me.