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DHOTTcTcy's avatar

A couple fun things to ponder: further west most of the Proterozoic rocks are covered by thick volumes of Palaeozoic rocks from (540-240 million years ago). Here they are missing and you have a gap of 1.5 billion years between the X and C units. A very long disconformity. One thought is the paleozoic and a lots else was there but got eroded away. Second these are the traces of Pangea which existed from chinle to entrada times. the chinle itself is remnant of vast, transpangean river systems, buried by the later wingate dune systems. The morrison represents the flooding of North America during the Jurassic at creation the Atlantic and destruction of pangea. The whole sequence records the construction, existence and destruction of a supercontinent.

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Tony Scialdone | GodWords's avatar

Growing up near Los Angeles and Seattle, I'd never heard of a hogback (or a flatiron). When we moved to Morrison, I assumed those were names given by the locals. Turns out they're very specific kinds of formations, which makes me wonder how many times I've seen either (or both) and not realized it.

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