June 19 - Whitehorse |
Ken & Case's Excellent Adventure June 19, Concertion Day |
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 In search of the illusive Concretions
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 To see a close up of the concrections pooping out of the hill click on the steep hill opposite. |
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 Heading home after a day of concretion hunting. Finn has the job of grading concretions |
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| 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 crescere meaning '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 . |