Pyrite Decay in Crinoids from Corey's Bluff, Crawfordsville Indiana?

[Mochaccino]

Hello all,

 

I hear that crinoids from a site known as "Corey's Bluff" of Crawfordsville, Indiana tend to be susceptible to pyrite decay. I don't know if this is a pattern but I've noticed a few crinoids from this location having black spots that I'm told are pyrite. Could I ask any members who've dealt with these crinoids or heard of this speak about their experiences? I noticed @Harry Pristis for one has some very nice crinoids from this site with such spots. I'd really appreciate any and all thoughts.

 

Thank you.

[Harry Pristis]

I've had the slab of crinoids from Corey's Bluff for more than 40 years with no problem.  I have never heard of pyritized specimens from that site.

[Mochaccino]

8 hours ago, Harry Pristis said:

I've had the slab of crinoids from Corey's Bluff for more than 40 years with no problem.  I have never heard of pyritized specimens from that site.

I see, good to know they've been stable, thank you!