Concretions Rock! (really cool rocks.)

Concretions

My neighbor has the coolest rock garden.  They aren’t really rocks but to me they are so beautiful.  They are perfectly round and come in sizes from very large to very small.

Growing up in the North end of Columbus, Ohio I saw my very 1st concretions at an impressionable young age.  When the shale riverbanks and nearby hills of the Olentangy river were disrupted to build the I270 outer belt, many concretions were unearthed.  Because of the hardness the bulldozers didn’t destroy them and ended up dumping them in piles (still visible today if you know where to look)  Apparently my neighbor found a few on a work site and brought them home. 

It truly amazes me when we find something natural that is so perfectly ordered and sculptured like crystals and concretions.  Aren’t things supposed to be random in nature?  Aren’t things supposed to fall apart over time?  I appreciate natural things that visually challenge our arrogant tendency to simplify nature.  Obviously these aren’t just ordinary rocks.

Concretion

Concretion

Concretion w/ cell phone for size perspective

Concretion w/ cell phone for size perspective

Cute little concretion

Cute little concretion

Concretion

Concretion

From Wikipedia.org “Concretions”

A concretion is a volume of sedimentary rock in which a mineral cement fills the porosity (i.e. the spaces between the sediment grains). Concretions are often ovoid or spherical in shape, although irregular shapes also occur. The word ‘concretion’ is derived from the Latin con meaning ‘together’ and cresceremeaning ‘to grow’. Concretions form within layers of sedimentary strata that have already been deposited. They usually form early in the burial history of the sediment, before the rest of the sediment is hardened into rock. This concretionary cement often makes the concretion harder and more resistant to weathering than the host stratum.

Enjoy!

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