Found in upper Himalayan river bed, looks like ammonite, any information?
Looks relatively modern. Rock type is apparently a black shale with a pyritic preservation of fossils. It would be helpful to have the finding place somewhat more exactly defined.
There is e.g. the Upper Jurassic Spiti Shale which has yielded an ammonite fauna. See e.g. Oloriz & Tintori 1991: http://rogov.zwz.ru/Oloriz,Tintori,1991.pdf
I agree--Jurassic or Cretaceous ammonite. Looks to be preserved in a siderite concretion. We see reworked ammonite-bearing Cretaceous concretions in river beds and glacial till in Alberta.
It is definitely an ammonite and I fully agree with my colleagues concerning the age. I suppose that upstream of the discovery is easy to find these fossiliferous units cropping out. I suggest to have a look to existing geological maps, if any!
Just came across the question and an answer might be obsolete by now. The specimen looks like Blanfordiceras (or something close to it), an ammonite that seems to be quite common in the upper Jurassic Spiti Shales. Pyritization is common in this formation and nice specimens can be bought as "souvenirs" on markets in Nepal.
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