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This is not about the identification of a fossil (it's an Asineopps squamifrons) but about the identification of a quarry unknown to me. I received two Asineops squamifrons from a friend, unfortunately without a location (he received it as a gift, the fish themselves are not very well prepped). What irritates me is that the rock doesn't look like Green River Formation at all - at least not like the rocks I have encountered in the quarries around Kemmerer. The rock is relatively fine-grained and very dark, almost black, and probably has a high organic content. The two Asineops in it also look almost charred. I've only dug once at Lake Gosiute sites (Currant Creek Ranch), but I don't know of any dark rock like this from there either. And it doesn't look like Farson either. I am at a bit of a loss. Can anyone give me a hint as to where this slab could be from?
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- asineops
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Asineops (Greek for "donkey-faced") squamifrons was first described by Cope as having an affinity to the pirat perch family. Later, with more detailed study, this species was found to lack the diagnostic characters of that family. Thus it is not yet clearly assignable to order. Although this species is much rarer in the Fossil Lake sediments than in Lake Gosiute deposits, the specimens from Fossil Lake are much larger than those from Lake Gosiute. Line drawing from Grande 1984: Identified by oilshale using Grande 1984. References: Cope, Edward D. (1870). Observations on the Fishes of the Tertiary Shales of Green Nov. River, Wyoming Territory. Proc. Amer. Philos. Soc. Vol. 21 XI, pp. 380-384. Grande, L, (1984). Paleontology of the Green River Formation, with a Review of the Fish Fauna. Bulletin 63, the Geological Survey of Wyoming.
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Asineops squamifrons was first described by Cope as having an affinity to the pirat perch family. Later, with more detailed study, this species was found to lack the diagnostic characters of that family. Thus it is not yet clearly assignable to order. Although this species is much rarer in the Fossil Lake sediments than in Lake Gosiute deposits, the specimens from Fossil Lake are much larger than those from Lake Gosiute.