Day #39 Deskcrop: Oolitic/Pisolitic Grainstone

We’ll begin the week where we left off last week – at a roadcut on the south side of Douglas Pass in western Colorado. In fact, today’s deskcrop was formed in pretty much the same depositional environment within the Eocene Green River Formation’s lacustrine facies as last Friday’s. Today’s displays a remarkable texture (best viewed large in Flickr) with plenty of primary porosity in the interstices between the oolites/pisolites that make up the bulk of this rock. It sure would’ve been interesting to frolic in the shallows of this lake…

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Oolitic/Pisolitic Grainstone

Explore this and all of my 2010 Deskcrops and Outcrops in Google Earth!

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