Middens are analyzed in specialized laboratories such as the USGS-NAU Macrobotanical Laboratory. The midden is first dissected, the fossil parts are extracted from the matrix of crystalized urine by washing, and then the fossils are identified through the use of comparative collections of plants, pollen, bones, and other materials.
So I do apologize, I see snakes as they fit into history of our planet. Not into deli cups.
At this time, all this information is at your finger tips. Just google up, any and all of these subjects.

Packrat mittens are important to herp studies as snake bones did not fossilize well and was rare to find. Mittens, gave a history lesson going back 50,000 years. Which is not a long time in the history of the earth. But showed it was very different from now. Just the simple thought that snakes migrated across a land bridge connecting Alaska and Russia, tells you conditions were much different then today.

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