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Please help ID this fossil


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PaleoOrdo
Posted (edited)

I found this strange stone in Hadeland in Norway. On it I found patterns of 2 nautiloids and some STRANGE structures. Could it be a sponge? The age is middle Katian, Upper Ordovician.

IMG_20210503_102854.thumb.jpg.5d9e3cd48fd1537e2bc6de8d489eefd6.jpg

Enlarged nautiloid part, not an ortoconic?

IMG_20210503_102928.jpg.0af72174e246c68f80f7dfa2223de030.jpg

 

IMG_20210503_102918.thumb.jpg.96b91084b4a70394c423043d09a94603.jpg

 

IMG_20210503_102928.thumb.jpg.cdcf98c49303e4a41aa1c77397b44f71.jpg

IMG_20210503_102946.thumb.jpg.2da41f25dde4131cd427ade8fc5c788f.jpg

IMG_20210503_103023.thumb.jpg.6d8e652b2ac50b95bba2d9c03bf2e89d.jpg

IMG_20210503_103111.thumb.jpg.cfc4036b919083ec8fb03b721dfdaa52.jpg

The "arm"-structures are on all sides of the stones. Finally, the last side with a rather unusual form of a nautiloid, not so well preserved. Can it be called orthoconic when it expands its diameter so rapidly?

InkedIMG_20210503_103054_LI.thumb.jpg.211e1f8782160306b82aa5bf80f0fc07.jpg

 

 

Edited by PaleoOrdo
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Tetradium

No sponges. I see a horn coral in #7. 

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fifbrindacier
On 6/6/2021 at 11:59 AM, PaleoOrdo said:

IMG_20210503_103023.thumb.jpg.6d8e652b2ac50b95bba2d9c03bf2e89d.jpg

There are "shelly" things here, i think the little branched one is a bryozoan.

 

Quote

IMG_20210503_103111.thumb.jpg.cfc4036b919083ec8fb03b721dfdaa52.jpg

 I see what could be a coral here.

 

 

 

 

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PaleoOrdo
10 hours ago, Tetradium said:

No sponges. I see a horn coral in #7. 

I see the horn coral, but I mean the long "arm" or branching white structures. If not sponge, are they just crystal intrusions? It is hard to believe that for example the spiral form in this picture is made by an intrusion. Maybe it is a bryozoan?

IMG_20210503_102918.thumb.jpg.96b91084b4a70394c423043d09a94603.jpg

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Rockwood

The inverted V shape in the sixth photo is typical of a sectioning of crinoid stem with a large lumen. The texture of the irregular forms in questions is similar enough to make me wonder if they could be crinoid holdfast structures.

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minnbuckeye
21 hours ago, PaleoOrdo said:

IMG_20210503_103111.thumb.jpg.cfc4036b919083ec8fb03b721dfdaa52.jpg

  This image shows the white structures are tubular, especially seen on the lower end of this example. Whereas the lower picture shows the items in question split in half. Could they be burrows??? Just a guess. 

 

21 hours ago, PaleoOrdo said:

IMG_20210503_102946.thumb.jpg.2da41f25dde4131cd427ade8fc5c788f.jpg

 

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PaleoOrdo
Posted (edited)
34 minutes ago, minnbuckeye said:

This image shows the white structures are tubular, especially seen on the lower end of this example. Whereas the lower picture shows the items in question split in half. Could they be burrows?

It is a nice observation that the structures are tubular, but if they were burrows (for example from a worm) should we not expect less varation in the thickness of the tubes and even more irregular patterns of the lines?

Edited by PaleoOrdo
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Rockwood

Could we be missing the tree for the forest here ? I can see it being a big gastropod that is sectioned in this way.

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Fossildude19

Cross sections are very difficult to identify .

 

I think it will be impossible, without breaking the rock up to see what gets exposed. 

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Rockwood

:popcorn:

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PaleoOrdo
5 hours ago, Rockwood said:

Could we be missing the tree for the forest here ? I can see it being a big gastropod that is sectioned in this way.

I like the way you think. I am considering both the tree and the forest as options. Maybe I should open the stone, but I am in doubt as I not have the skills to do that in a proper way.

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Rockwood
1 hour ago, PaleoOrdo said:

proper way.

Hee hee hee :chuckle: Got a hammer ?

Just what I might consider. :Confused05:

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Fossildude19

I don't believe there is anything so special here that would warrant NOT breaking the rock. 

Just my 2 cents.   :shrug:

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PaleoOrdo
Posted (edited)

I agree Tim og Rockwood. I will break it open starting from one or two of the corner of the rock, or maybe through the divisions already in the rock, calling upon the strength of the old norse God, "Thor with the hammer". By the way, it will rain and be lightening and thunder here in Norway today.

Edited by PaleoOrdo
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PaleoOrdo

I managed to open the rock with my hammer, it was little to see inside it, except two big bivalve with nice colors (!) and one rugose coral line form, the white lines was not any clearer inside just recrystalisations preserved, still think those are bryozoa or coral.

786691481_VF2LU.thumb.jpg.ffbffebd630c53c900415e06f225a13c.jpg

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On 6/6/2021 at 11:59 AM, PaleoOrdo said:

IMG_20210503_103023.thumb.jpg.6d8e652b2ac50b95bba2d9c03bf2e89d.jpg

There are "shelly" things here, i think the little branched one is a bryozoan.

 

Quote

IMG_20210503_103111.thumb.jpg.cfc4036b919083ec8fb03b721dfdaa52.jpg

 

 I see what could be a coral here.

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