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I’m not even sure this is a fossil? Penarth, Wales UK - Jurassic, Blue Lias?


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I’m a complete beginner so please forgive my ignorance. I found this on my second time deliberately looking for fossils. Honestly, I’ve no idea if it’s a fossil. I did find some other interesting things too but nothing like this.

 

I’ve researched Penarth and it’s suggested that the formation is early Blue Lias? Or Lias Group and dates to Jurassic period. This was found towards the bottom of a cliff and I do not believe it’s been submerged by the sea.

 

Thanks in advance for any pointers,

 

Nathan

9368BF4A-EE3A-4759-85B3-D4B0B2180560.jpeg

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JohnBrewer

Not really sure, Nathan but I think you have something there.  I expect @TqB will know :) 

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Something mineralogical I think, it looks superficial - perhaps gypsum crust?

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Thanks @JohnBrewer and @TqB. Now I’ve looked up Gypsum Crust, certainly looks similar. The texture of the bits in the middle vs the rest of the light grey area is different, much more rough but not sure if that’s just a difference in erosion? What caught my eye was the distinctive shape and that the bit above looks similar and of a similar orientation. Either way I think I’ll hold onto it :)

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Mark Kmiecik

Post some pics of all the other sides, and keep it all in-frame so the entire specimen is visible.

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As water percolates through rock it will concentrate some minerals in discrete layers (forget what the process is called at the moment).

I think that is what this is. So- a concentration of minerals in a layer of the rock, not a fossil.

 

Maybe @Rockwood can remember what it is called.

Or maybe it was @Sagebrush Steve that I discussed this with.

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DeepTimeIsotopes
43 minutes ago, ynot said:

As water percolates through rock it will concentrate some minerals in discrete layers (forget what the process is called at the moment).

I think that is what this is. So- a concentration of minerals in a layer of the rock, not a fossil.

 

Maybe @Rockwood can remember what it is called.

Are you thinking of dissolution and deposition?

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1 hour ago, ynot said:

As water percolates through rock it will concentrate some minerals in discrete layers

Are you thinking of liesegang banding ?

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1 hour ago, Rockwood said:

Are you thinking of liesegang banding ?

No. Liesegang banding  radiates from a core and tend to be orbicular in nature. 

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2 hours ago, UtahFossilHunter said:

Are you thinking of dissolution and deposition?

That is the process that forms the layers, but not the geologic name.

Had a lengthy discussion on the  subject with someone here on TFF about a year age, but not sure who it was.

This is driving Me nuts........

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DeepTimeIsotopes
26 minutes ago, ynot said:

That is the process that forms the layers, but not the geologic name.

Had a lengthy discussion on the  subject with someone here on TFF about a year age, but not sure who it was.

This is driving Me nuts........

There’s “foliation” but that process doesn’t include water...

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Just now, UtahFossilHunter said:

There’s “foliation” but that process doesn’t include water...

Foliation is the bending of rock by external pressures. Looks nothing like this piece.

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Sagebrush Steve
3 hours ago, ynot said:

As water percolates through rock it will concentrate some minerals in discrete layers (forget what the process is called at the moment).

I think that is what this is. So- a concentration of minerals in a layer of the rock, not a fossil.

 

Maybe @Rockwood can remember what it is called.

Or maybe it was @Sagebrush Steve that I discussed this with.

No, it wasn’t me. But you’ve got me curious. Hopefully someone will know the name.

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Mark Kmiecik
1 hour ago, Sagebrush Steve said:

No, it wasn’t me. But you’ve got me curious. Hopefully someone will know the name.

Permineralization? Striation? Stratification? Antidisestablishmentarianism?

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It looks like simple hydration/oxidation weathering to me.

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DPS Ammonite
11 hours ago, ynot said:

That is the process that forms the layers, but not the geologic name.

Had a lengthy discussion on the  subject with someone here on TFF about a year age, but not sure who it was.

This is driving Me nuts........

Diffusion banding? Weathering rinds? 

 

https://onlinelibrary.wiley.com/doi/full/10.1111/gfl.12056

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This is from another angle. I think perhaps you guys are right and a layer of whatever(?) has been eroded to leave what it is I can see. From this angle you can see that the feature is raised a little.

 

On a separate note, I found some other interesting bits and would like some help identifying but I’m not sure on the etiquette for the forum. Would it be best to include one new topic with a handful of specimens or a new topic for each?

4ACA2BE8-5BBD-4BE4-9D27-9023016FE1B4.jpeg

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51 minutes ago, n8state said:

I found some other interesting bits and would like some help identifying but I’m not sure on the etiquette for the forum. Would it be best to include one new topic with a handful of specimens or a new topic for each?

It is better to limit the number of pieces in one thread and You can start as many threads as You want.

If there are more than 1 piece in a thread, please number them. And include a scale.

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52 minutes ago, abyssunder said:

Septarian - like propagation cracks?

Or the shape is right for syneresis cracks maybe ?

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abyssunder
On 5/14/2019 at 2:47 AM, Rockwood said:

Or the shape is right for syneresis cracks maybe ?

Maybe, I would agree with you. :dinothumb:

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