Silurian or Devonian

[Dimitar]

Hello guys!

Please assist for dating of such rocks.  I suspect it is Silurian, but it could be also later Devonian. I find plenty of these here like pieces of rocks.  Gray-blue - in color, very hard.  It is lile a cement, but harder than cement. And it has lot of organic materials inside - mostli marine plants or animal.  The diameter of the stems is 3-4 cm and more. 

 

N.1

N.2

 

N.3

 

N.4

 

N.5

 

N.6

 

N.7

 

N.8

 

N.9

N.10 - here we see some small brachiopod

 

N.11

Edited May 12, 2021 by Dimitar

[Dimitar]

This one is very similar to the other one that I asked before:

 

[Dimitar]

Any suggestions please?  silurian or devonian?  I think it shold be silurian, because it seems to be on top of ordovician. However I find the ordovician rocks on one place and these Silurian/ Devonian  rocks are spread at many locaions, but not exactly on top of the ordovicians. 

[Rockwood]

At this level of preservation it's going to be a tough call to make. 

[Carl]

The first few pictures show what is called "hackle fringe," which is a type of rock fracture rather than a fossil. The long, light, evenly divided rectangles appear to be crinoids. And the shells following that are probably brachiopods.

[ClearLake]

I’m with @Carl, #7,8,9 appear to be crinoids and #10 are a couple of brachiopods, the rest I’m not sure if there are any distinctive fossils in there. And as @Rockwood has pointed out, with the relatively poor preservation (they appear to be silicified which could account for the hardness) I’m not sure you are getting much further than that. Perhaps someone familiar with the local formations could narrow it down based on the rock and the preservation, but that is not me.