Wednesday, March 12, 2014

Roxbury Conglomerate Puddingstone

There is an outcropping of Roxbury Conglomerate on the beach in Hull, an assemblance of pre-Devonian granite pebbles and cobbles in the conglomming medium of muds.  A snapshot of the geology at that period, with less interesting sedimentaries because the contributing landmass was more upswelled ignitions than previously deposited record rocks.  But the rock is rock-hard, not flimsy for being conglomerated.

Rocks have become more interesting as time has gone on since the Cambrian, since calciferous lifeforms have deposited immense calcium, now known as limestone and marble, and carbon is laid down in fossil fuel rocks.

The Roxbury Conglomerate represents a time when the life of earth did not contribute so much to deposition, although it is lightly present, more in the sea than the highlands that fell into the muddy seas that created this formation.

The most interesting rocks in my purely amateur opinion are from the sedimentaries of the life period.  

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