ID Help Please

[Mr.Waffles]

Hey guys. I usually hang out in the Native American Artifact forum but today I did some fossil hunting and found something I can't ID.

I'm in Northern Arizona in an area full of crinoid, bryozoan, and brachiopod fossils. The first 4 images are examples of these.

The last 4 images are what I'm trying to identify. Found alongside the other fossils, this last one is embedded in limestone (i think), round, and pitted like a golf ball. I'd crack it open but I'm kinda concerned about damaging the fossil. Any ideas what it is? Im no paleontologist but my theory is that some caveman lost his golf ball in a water hazard on a prehistoric golf course 500 million years ago.

You guys are the experts here so any help would be appreciated!

 

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[Indian Steve]

Possibly the "head" of a crinoid?

 

[Mr.Waffles]

Possibly but I'm not sure. Other these hexagon shapes are pits and go into the golf ball. When I look at other fossils of crinoids it looks like the have little bumps protruding out of the head, not in or hexagon shaped.

 

[Mackaydon]

Top pic looks like a scallop shell.
Don.......

 

[Older The Better]

I thought caylix (sp)? too. Maybe some other kind of echinoderm.

 

[Mr.Waffles]

It could be a calyx but because the little hexagons on my fossil are inward, not outward it doesn't seem to match photos of other specimens online. However I did stumble across pictures of Cyclocrinites online. Do think that could be it?

 

[KaliCo]

It looks like coral to me. I have buckets of it here, various kinds, and it kind of looks like it could be coral encased in there. Here is a quick photo of one piece of mine. Taken in the house (dark outside right now).

 

[Charlie P. (NY)]

In Michigan they call them "Petosky Stones". Fossilized coral.

 

[Mr.Waffles]

I chipped off some of the top rock with a chisel. My initial thought was a sponge as well, but now I'm think that it may be the calyx of a crinoid.