This is all "old stuff" from the end of the 60ties and 70ties (of the last century). Oil shale was actively mined starting in 1859 - mining ceased in 1971. In 1967, I started to collect in Messel at age of 15 (when I was still in school). At that time, even though the pit and the abundant fossils were well known to science for more than 100 years, nobody was really interested in fossils from Messel. Reason for this was: The slate there contains around 40% water - when the water evaporates, the s
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