Is this a fossil

[skikat]

Found this rock in a river bank. Im just wondering what it is. I haven't seen this pattern on rock before. Please give advise.p

 

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[bronco]

Awesome
You have found yourself a mastadon/ mammoth or other like "Mega fauna" tooth.
You'll id close species quickly... search up mammoth teeth images, dig in from there and im sure you'll find similar and tons of ID info.
Glad I could be the first to help for once. I have found a couple . Let us know when you id species!

 

[bronco]

I'd go back and see what else you can find. in that same spot. Those dentine ridges are a lot wider then I'm used to seeing. Interesting. Big critter though