I was browsing the Abandoned Coal Mine database looking for information on the Sego mines (Chesterfield 1, 2 and 3) and found a map showing the arrangement of the sediment layers, and some of the layers are labled as "bone" or "shale and bone". Question: Is this a mining term, or does it literally mean that those layers are rich in fossil deposits? A resident of the town in the 1920s told me that the mines were temporarily closed a few times as fossils were discovered and removed.
Capture.jpg
Image from Chesterfield No.2 maps folder, http://geology.utah.gov/databases/umsh/index.html
Thanks,
Josh B.



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