What is this?

[Secolo]

Found this in Morrison clay.  This is what is uncovered, not sure sure if it’s petrified bone or plant. Any ideas ? In southeast colorado.

[Fossildude19]

This looks geologic in nature, to me.
Maybe limestone with some agate, quartz,  or chert inclusions?

[Rockwood]

I can understand why something on the surface like this might suggest bones of an animal. However, I think the reason these stand out the way a body might is that they are more resistant to weathering and erosion than the surrounding rock.

[JohnJ]

Freeze/thaw fractured silicate rock. 

[jpc]

Looks like typical Morrison Fm chert

 

[Secolo]

How or what causes this to form like it does.  You don’t see it anywhere other than the Morrison.  Thanks for taking time to educate me.

[Rockwood]

8 hours ago, Secolo said:

How or what causes this to form like it does.  You don’t see it anywhere other than the Morrison.  Thanks for taking time to educate me.

If no one gives a better answer type this into a search engine. morrison formation silicate

[jpc]

14 hours ago, Secolo said:

How or what causes this to form like it does.  You don’t see it anywhere other than the Morrison.  Thanks for taking time to educate me.

I do not have answer for this, but I find it in certain Eocene beds in southwestern WY.