Museum Quality Fossil Rock w Unknown Object 3.3 Lb. from Siberia Region Russia

Description

Museum Quality Fossil Rock with Unknown Object from Siberia Russian Region.
Heavy rock, a little more than 3.3 lbs and size is 11.25" H x 8.25" W about 1" Thick.
This rock from my own collection. Purchased in 1970's in this period time i lived and study in Ukraine (i am original from Ukraine). I have University diploma work about native Siberian folk stories and culture...so my long story i make short when i visiting  Siberia and in one small village school have some fossils and other bones founded by local kids...this one really catch my eye and i ask if they willing to sell...sense then its sitting in my storage and its time to let go....
this fossil come with Lucite stand to display.
Really i don't know objects on this stone (please view photos).
If you have any questions or need more photos ask I'll do my best to answer.
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Thank you for viewing.