Dinosaur teeth pieces?

[clf_02]

Found these in a creek. Smallest piece is about 2"x2" and the largest piece is about 4"x3". I am pretty sure they are dinosaur. Just would like to know what kind.

 

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[Gunrunner61]

Don't we have a fossil forum on here somewhere? thats where i'd post them

 

[Broken knee]

Can you post other pics of the top one?
Broken Knee

 

[clf_02]

 

[smcdmc]

I'm certainly not an expert on the subject, but the smaller one looks kind of like a piece of agate.

 

[Digs68]

Looks like pieces of mammoth or mastodon enamel (tooth shards). Depending on where you live, they can sometimes be common. Either way, still cool finds.