Sharks teeth that are gray multicolored.

[CrazyDiamond]

 OK I was curious about the sharks teeth in this photo that are grayish multicolored, I've never found any like this before.  I was just wondering if the multicoloring  would identify it as a specific type of shark or is it just a sign of aging? These are all from the same Creek - Post Oak in Sherman.  I found a lot that are like multicolored they're really pretty. Thanks.

[Doctor Mud]

Hi CrazyDiamond

 

This patterning isn't specific to a type of shark but indicates a different mineralization after burial.

 

These spider web like patterns can sometimes form when fossils are in contact with plant rootlets that help transport water and minerals.

 

Like your screen name btw. Makes me think of that awesome Pink Floyd song.

[JarrodB]

They come in quite a few colors at POC but you can't tell the species from the color. You have some nice ones there. 

[CrazyDiamond]

1 hour ago, Doctor Mud said:

Hi CrazyDiamond

 

This patterning isn't specific to a type of shark but indicates a different mineralization after burial.

 

These spider web like patterns can sometimes form when fossils are in contact with plant rootlets that help transport water and minerals.

 

Like your screen name btw. Makes me think of that awesome Pink Floyd song.

 

1 hour ago, JarrodB said:

They come in quite a few colors at POC but you can't tell the species from the color. You have some nice ones there. 

Thanks, guys - yeah, they sure look cool when they are the different colors.  The bigger one on the end that is cut off a bit in the picture, it is really cool, it has like browns, reds, and orange colors on the other side of it. 

Shine on! (I think that is the song you are thinking)

Laura

[snolly50]

2 hours ago, Doctor Mud said:

Like your screen name btw. Makes me think of that awesome Pink Floyd song.

[RickNC]

I find them like that on occasion. 

[Macrophyseter]

The different colors actually appear during fossilization stages when different minerals take over, like dr mud said. If you break it open (please don't thou), you can see mineral particles and probably a few shiny ones inside, which shows that everything just rocks and minerals.

 

And in case you wanted to know what species of shark they are, heres my guesses-

The long pointy teeth are upper teeth from either Sand Tigers or Straitolamna. I'm no expert in Post-Oak Sherman geology, but I do know that Texas has a lot of Cretaceous-Paleogene fossils, and if that is a Cretaceous formation, then maybe it could also be Scapanorhynchus teeth. (I would say that the long pointy ones with "buldging" edges are Straitolamna, but I may need an actual expert to confirm this)

 

The shorter, wider teeth could be lower teeth of the same sharks I listed above, or from Cretolamna appendicula.

 

Again, these are just the best guesses I can make, but I'm not a professional, and I may need one to confirm this. Nice teeth btw!

 

[fossiling]

Nice teeth! But, as the others all said, you cannot determine species from color, because the color comes from the surrounding mineral.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

no, I was lying. You cannot determine species from color because potato.