Silicate veins in coral?

[wendyeeeo]

I found these in Lubbock, TX in an area having lots of ammonite fossils. These feel more like a skeleton of silica or something. And they have a blueish tint. Any ideas?

[Raggedy Man]

Any chance you can get closer pictures? Im having a hard time identifying the structures you're referencing in your post. 

[wendyeeeo]

[Fossildude19]

I'm not seeing anything fossil related in these pictures.  

[Raggedy Man]

49 minutes ago, Fossildude19 said:

I'm not seeing anything fossil related in these pictures.  

I agree with Tim. It could be the result of mineral growth within gas pockets over time.

[abyssunder]

They look like eroded limestone pieces, to me.

 

picture from here

[Rockwood]

I will combine the circular shapes in the first post, the general appearance of the second, and my experience with poor preservation at one of my favorite spots, and say they are crinoid columnals.

By the way it's my favorite because there are rare occurrences of spectacular preservation as silisified fossils in carbonate matrix.

[Rockwood]

Here is an example to illustrate my thinking.

[abyssunder]

I'm not familiar with the area, but in a search of mine, Lubbock county doesn't show up sediments older than late Triassic, also I can't recognise crinoid columnals (or pluricolumnals) in the pictures posted. Knowing from which deposit they came from may rule out some hypothesis.

[Rockwood]

25 minutes ago, abyssunder said:

I'm not familiar with the area, but in a search of mine, Lubbock county doesn't show up sediments older than late Triassic,

And this is a problem for a crinoid ID in what way ?

[abyssunder]

26 minutes ago, Rockwood said:

And this is a problem for a crinoid ID in what way ?

Maybe I'm not looknig it right, but I can't recognize the joined patterns of crinoid columnals.

 

Why do you think there might be crinoid remains?

[Rockwood]

27 minutes ago, abyssunder said:

Maybe I'm not looknig it right, but I can't recognize the joined patterns of crinoid columnals.

 

Why do you think there might be crinoid remains?

The number of concentric circles which seem to be slightly lighter shaded between them with a dark center. 

Another argument would be the nature of the rock. It looks very similar to many in the area that the example I posted was found some of which contain recognizable fossils and therefore not the sort of sediment that would seem likely to preserve bubbles.  

[Ludwigia]

I'm in the rock camp. No matter how I try, I just can't recognize anything fossiliferous in this sample.

[Rockwood]

1 hour ago, Ludwigia said:

I'm in the rock camp.

Ya I guess it's time. 

[Herb]

I see some bryozoa in the L center

[ynot]

52 minutes ago, Herb said:

I see some bryozoa in the L center

On which rock?

[Ludwigia]

6 hours ago, Herb said:

I see some bryozoa in the L center

Can you magnify that? I can't see a thing.

[Herb]

my bad Rockwood, I was looking at the pix you posted.  I do not see any fossils in Wendyeeeo's pix

[Rockwood]

7 hours ago, Herb said:

my bad Rockwood, I was looking at the pix you posted.  I do not see any fossils in Wendyeeeo's pix

Then oops again. 

That's heliolitid coral. 

[wendyeeeo]

Yes!!  Thank you!