1.3m diameter vertebrae found

you should find out the geology and environment from which it came before you do anything else


you did mean 1.3 meters ?

Benn why not post a snapshot of your find

If you found it in back of a school, I might guess it's just a plaster prop from a school play. Legit vertebrae that size are rarely found, but certainly exist. The largest dinosaur vertebra ever found was about that size, from the 85-foot long "Dreadnoughtus."

http://wunc.org/post/nc-state-student-uncovered-neck-bone-biggest-dinosaur-ever#stream/0
Some whales can have an even greater width (though finer bones) such as this, from a blue whale:

http://www.pressdemocrat.com/news/2216545-181/buried-whale-skeleton-unearthed-reassembled?gallery=2339173