Here's a section of a page I recently uploaded--about a specific
superior middle Miocene paleontologic site in Nevada's Great Basin
Desert--a place that yields many 14.5 million year-old fossil insects
preserved along the natural bedding planes of "paper shales"--successive detrital accumulations so thinly bedded than each individual layer is no thicker than a proverbial sheet of paper.
Images of fossil insects from the middle Miocene Esmeralda Formation,
Nevada:
http://inyo2.coffeecup.com/fossilvalley/fossilvalley.html#insects
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