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Dimitar
Posted (edited)

I found this specimen in Laval, on the South shore, West side. There was a fall there, next to the river  there is a mixture of different layers. 

The time should be after Ordovician or late Ordovician.   The rock is black, on very thin flat layers. Some layers are very hard / silicates/ other are fragile, mud - coal .   Initially I expected it to be nautiloid. But when I did the pictures I rejected it.

 

 

 

 

20210604_223239.jpg

1. Both parts

 

 

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2. 

 

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3.

 

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4. Side view - both parts

 

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5. Cleaned (lower part)

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6.

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7.

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8.

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9.

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10.

20210605_092852.jpg

11.

Edited by Dimitar
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Dimitar
Posted (edited)

20210605_093506.jpg

12. Transverse view

20210605_093312.jpg

13 . Other small fossils in the upper side on the reverse plate

Edited by Dimitar
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Tidgy's Dad

Squished nautiloid for me. 

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Dimitar
Posted (edited)

There are nautiloids in the same rocks. Here is another example, a lot better visible:

 

20210604_222054.jpg

 

 

20210604_222158.jpg

 

 

20210604_222040.jpg

Edited by Dimitar
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Orthoconic nautiloids commonly appear in the upper Ordovician shales as compressed due to pressure from preservation. The colour is on account of pyrite from available sulfides in the initial mud allowing for mineral replacement. There will be no coal in these formations, as coalification mostly occurred during the Carboniferous.

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