ID? Of sink stone

[DesertDug]

Found Brewster Co. far west Texas. Lots of fossils in the area. I think this may be a shell? Want to make a sink out of it if I can figure out how. Need some good advice and knowledge. 

 

What is it? 

Top view first. 16" diameter.

second  bottom view.

then the edge. 6" in total height of dome as bottom is flat.

 

 

[ynot]

I think it is an odd shaped rock, not a fossil.

[Rockwood]

Layered concretion ?

[DesertDug]

What would give it it's shape?

[ynot]

39 minutes ago, DesertDug said:

What would give it it's shape?

Nature loves a round rock. It works hard to make them all that way.

[Rockwood]

4 minutes ago, ynot said:

Nature loves a round rock. It works hard to make them all that way.

It's less fond of bird baths.

Concave on one side isn't it ? @DesertDug

[DesertDug]

20 hours ago, Rockwood said:

It's less fond of bird baths.

Concave on one side isn't it ? @DesertDug

Yes slightly concave on the one side?

[ynot]

17 minutes ago, DesertDug said:

Yes slightly concave on the one side?

 

21 hours ago, Rockwood said:

Concave on one side isn't it ?

Separated on a bedding plane.

[Rockwood]

3 hours ago, ynot said:

 

Separated on a bedding plane.

With all due respect. That's no bedding plane. It's circular, and not even cleaved on a plane.  

[Xiphactinus]

2 hours ago, Rockwood said:

With all due respect. That's no bedding plane. It's circular, and not even cleaved on a plane.  

Actually, it is. See the straight lines in the edge in your last 2 photos?  Your concretion split on a line like that. If you place your concretion on a mirror flat side down, you’d have a good idea what it would have looked like complete. 

[Rockwood]

2 minutes ago, Xiphactinus said:

Actually, it is.

My beef is with it being just a rock cleaved on a random bedding plane.

Can I take it you are with me on that ? 

[KimTexan]

Being concave on the one side could just be differential weathering. Where water accumulated and then softened the material and eroded it away more in the center over time. I don’t know what it is. It could be a layered concretion. Other options are sponges and stromatolites that can take that shape. I’ve never seen a sponge fossil that big though. I have seen stromatolites that size. The fine layering could be indicative of stromatolite since biomaterial tends to grape layer upon layer. 

 

Do you know the formation there? I tried looking but there are a lot of formations in the area. Most of which seem to be Cenozoic and terrestrial, but there are a few marine deposits.

 

[DeepTimeIsotopes]

6 minutes ago, KimTexan said:

I have seen stromatolites that size.

+1 I’d say stromatolite as well

[DesertDug]

2 hours ago, UtahFossilHunter said:

+1 I’d say stromatolite as well

These are known to be found in this area.  I was hopeful it was one. 

 

How would one one go about cutting and polishing the stone/ formation.?  Where does one look for such information? Is there places that provide such services?

 

thanks for all the replies. 

[DesertDug]

2 hours ago, KimTexan said:

Do you know the formation there? I tried looking but there are a lot of formations in the area. Most of which seem to be Cenozoic and terrestrial, but there are a few marine deposits.

I do not know.  Found in the solitiro area of big bend  on my ranch land.