I’m not sure but I believe I found a fossil! What is it???

[Patriotgamer]

Well? I found this today “kicking rocks”. I’ve been in the business of fossil hunting for about an hour… total in my life… what did I find? 

[Fin Lover]

Welcome to the forum.  Looks manmade to me. 

[ynot]

can you post pictures of the other side and ends?

[Patriotgamer]

The center piece (white) has a chalk like consistency but has great detail showing possible foramen and what looks like growth lines. Being in the medical field, my brain screamed bone (picked a few up in the course of my job over the years) which is what originally garnered my attention.  The broken outside shell is rock, but it has what looks like rust particles in it. I have an email into the state paleontologist group in Bismarck (found in North Dakota) to see if it’s something they might recognize. I’ll let ya know!

[Patriotgamer]

Here are some more pictures with size in inches

[ynot]

I think this is a small piece of an agate vein with some clay or chalk matrix still attached.

There is no bone cellular structure visible and only a vague resemblance in shape.

That is why you can not really place what bone it could be.

[FranzBernhard]

This could be an ironstone concretion with a fresh, chalky, sideritic core and a limonitic, hard weathering crust. Note the gap between core and crust. This would be due to volume loss during transformation of siderite to "limonite".

Similar things were recovered here locally during gravel mining, when pits hit marl-clay bedrock. Sometimes, the core was just a sideritic slurry or paste.

Franz Bernhard.

[Fossildude19]

I have found concretions similar to this in various places.

[Patriotgamer]

Thanks to all! I was contacted by Clint, on of North Dakota’s paleontologists and the mysterious formation we see above is indeed a natural forming rock, but unfortunately it is not a fossil. I have copied his response below:

 

 

[Mark Kmiecik]

Iron siderite concretion, similar to this: