Even tho shark teeth, and the magnificent meg, are the most
popular fossils to hunt in the Aurora mines, there's a whole
lotta other stuff too.
So much other stuff as a matter of fact, I would usually set
my sights on collecting only two different types each visit.
For example, vertebrates and scallop shells, plus teeth, or,
clams and oyster shells, plus teeth. Otherwise you can quickly
get overloaded.

The are many ways a fossil can be formed and preserved.
Shark teeth and most of the shells in these pics are from
a process called simply enough, "Simple Burial".
Where teeth, plant remains, and limy shells often lie for long
periods of time without much change. Preserved like it was
lost yesterday, but now an extinct species.

Once you have decided what you're looking for, all you have
to do is go find the BIGgest one of them you can! 

Scallop shells.

And then, of course, the natural progression being,
to find the Biggest One with Both Halves!

My rarest tooth find to date isn't a shark tooth.
It's a whale.
Squalodon atlanticus.

Hey Joe! Sooooo glad to hear from you! You are sorely missed! 
Thanks for the clarification. I didn't realize that something would be considered a fossil without changing mineral composition. Therefore, I have thrown some away just thinking they were "just buried", and not exactly a fossil  . Like a lot of other things you have said, I wish you would have told me this earlier. You know how I don't learn, and yes, it is your responsibility.  And it is always the simplest things!
Of course, I never really thought that hard about fossils that much since they are not crystals. 

Tubeworn fossils. LOL  Coprolite always makes me laugh.  I guess its the 12-year old in me.

hey joe good to see ya around man !!! i miss goin out with you guys collecting  i ve been doing the solo thing not having alotta luck tho but gotta start somewhere ...... just wanted to say hi and hope too see ya soon !!!