Travelling in USA 2008/09 travel blog








Incredible sight - peaks and valleys of banded colours - desolate, eery.

[75 million years ago, a shallow sea teaming with life covered the USA Great Plains (from Gulf of Mexico in south, to Canada in north, from Iowa in east, to Wyoming in west) - this now appears as the greyish-black layer of shale, full of fossils of sea creatures. Then the land rose as the continental plates shifted, forming the Rockies, and the sea drained away - the land was then covered with dense sub-tropical forest, this in turn gave way to savannah and then later grassland as the climate cooled and dried. Result: a great range of fossilised soils (hence the vivid colours of the different layers) with enormous variety of fossils of extinct animals - large and small.]

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