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LiamL

Ammonite Shell or something else?

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LiamL

I cracked open a nodule last year on the Yorkshire Coast and it contained this Pseudolioceras Ammonite. 

It had this weird brown stuff all over it, was this the shell? 

As found

 

5c38c800a8954_Photo11-01-201943925pm-min.thumb.jpg.ad59580deee184b0052e1825364fc9d5.jpg

 

I tried to clean it up and clear the middle with my pen.

5c38c82f05ccc_Photo11-01-201943450pm-min.thumb.jpg.d0eeefee2cd49dcc3375e5a5cadcdfa4.jpg

 

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Misha

I can't help with this but it is definitely very interesting.

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FossilsAnonymous

Nice, whatever it is.

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ynot

Looks like a pyrite incrustation.

 

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LiamL
4 minutes ago, ynot said:

Looks like a pyrite incrustation.

 

The rock was relatively soft for Yorkshire standards wouldn't it spread all over?

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ynot
14 minutes ago, LiamL said:

The rock was relatively soft for Yorkshire standards wouldn't it spread all over?

There is no accounting for where the minerals will chose to grow . Maybe there was a stress crack in the area where the pyrite grew over the shell.

From the second picture it looks like a pyrite replacement.

Maybe one of the locals can chime in on this.

@JohnBrewer

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JohnBrewer

Looks like pyrite to me @LiamL but you seem to have shifted most of it. Was it difficult?

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JohnBrewer

@Ludwigia Roger may have some insight 

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LiamL
1 minute ago, JohnBrewer said:

Looks like pyrite to me @LiamL but you seem to have shifted most of it. Was it difficult?

Came right off easily with the side of the pen tip, reminded me of shell. Probably is pyrite but unusual how it grew only round the outside.

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JohnBrewer

@Crann has been a bit sleepy of late but he hunts and preps that area. 

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LiamL
8 minutes ago, JohnBrewer said:

@Crann has been a bit sleepy of late but he hunts and preps that area. 

He's too busy out hunting, i talk to him often :D

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JohnBrewer

Give crannyman my love :D 

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Bobby Rico

Maybe Tarquin will know @TqB .

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Ludwigia

I'll go along with pyrite replacement, although it's hard to tell from the photos.

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LiamL
4 minutes ago, Ludwigia said:

I'll go along with pyrite replacement, although it's hard to tell from the photos.

If it helps i posted a video of it on my instagram page when i found it

 

 

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ynot

Looking at the first picture a little closer and noticed the "black" layer is chipped (level with top finger.) exposing what looks like pyrite under it. That could indicate the black layer is the shell and the pyrite filled the interior of the shell (ie a steinkern).

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TqB
32 minutes ago, ynot said:

Looking at the first picture a little closer and noticed the "black" layer is chipped (level with top finger.) exposing what looks like pyrite under it. That could indicate the black layer is the shell and the pyrite filled the interior of the shell (ie a steinkern).

That's basically it although the pyrite isn't usually a solid steinkern with these, just a thin layer between the filling matrix and the shell. I think the pyrite may actually be a replacement of a shell inner lamination. It often forms where organic material has decomposed.

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Ludwigia

I'll second what Tarquin says.

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Crann
On 1/11/2019 at 8:43 PM, JohnBrewer said:

Give crannyman my love :D 

Awww... How did I end up back in here ? ha, I'm not too bad with ID's these days so don't come on anymore !!! Had some awesome finds and off to a good start in 2019 , Insta is so much easier for info if needed ! Me and Liam looking for a huge jaw packed with teeth, see who wins ! ha

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JohnBrewer
4 hours ago, Crann said:

Awww... How did I end up back in here ? ha, I'm not too bad with ID's these days so don't come on anymore !!! Had some awesome finds and off to a good start in 2019 , Insta is so much easier for info if needed ! Me and Liam looking for a huge jaw packed with teeth, see who wins ! ha

Nice to see you Crannyman! @Crann I don’t really use social media. 

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Crann
On 1/15/2019 at 8:52 PM, JohnBrewer said:

Nice to see you Crannyman! @Crann I don’t really use social media. 

I only use Insta and have a private account, keeps you in the loop of local finds ;)

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