Bivlaves occur as very thinned coquina blanket in the Mesozoic strata in southern Tibet (Tethyan Himalaya). Quite abundant by single taxon. What species or genus in what age? T, J, or K? or in epoch?
Hello Xianghui
I can give you just a broad idea, may be it will help you to direct your search. It seem to me that this could be genus Pectinidae, which lived from Messosoic on and is very frequent still today. Hopefully some paleonthologist will be of greater help.
Hi, Mirka,
Thank you for your helpful comment! Yes, I am going to ask a help of palaeonotologist!
The bivalves you figured look very much like Monotis, which are predominantly Norian (Late Triassic) in age. Monotis, as well as other thin-shelled pectiniid "flat clams" often occur locally in profusion in beds such as those you have figured.
You will meed to examine carefully the hinge line and auricles of the shell to confirm whether the material in fact is referable toy Monotis, or belongs to some other genus.
For a start you may wish to check out:
1.) Norman Silberling, 1997. The Late Triassic bivalve Monotis in accreted terranes of Alaska: U. S. Geological Survey Bulletin 2151,
2.) Chris McRoberts, 2011, LATE TRIASSIC BIVALVIA (CHIEFLY HALOBIIDAE AND MONOTIDAE) FROM THE PARDONET FORMATION, WILLISTON LAKE AREA, NORTHEASTERN BRITISH COLUMBIA, CANADA. JOURNAL OF PALEONTOLOGY, 85 (4): 613 - 664, and
3.) Hisao Ando 1987. Paleobiological study of the Late Triassic bivalve Monotis from Japan. Univ. Museum, Univ. of Tokyo, Bulletin 30.
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