What is it , bryozoan colony ?

[Denis Arcand]

Is this a bryozoan colony or something else ?

 

Sorry for the photo, but there are no visible details on the branches, I can't do better

Quebec, Ordovician, Nicolet River Formation

 

1

 

2

 

3

 

4

 

5

Edited Sunday at 11:33 PM by Denis Arcand

[westcoast]

These are tool marks on the base of a bed, so geological, sedimentary structures.

[rocket]

or perhaps imprints of an ichnofossil

[Denis Arcand]

36 minutes ago, westcoast said:

These are tool marks on the base of a bed, so geological, sedimentary structures.

I understand you're saying that it is geological in nature, but I'm not clear on how it was formed.

[Denis Arcand]

22 minutes ago, rocket said:

or perhaps imprints of an ichnofossil

That would be my guess but I'm not an expert 

[Rockwood]

Is this a part and counterpart or two specimens?

[Denis Arcand]

9 minutes ago, Rockwood said:

Is this a part and counterpart or two specimens?

 

Photos 2 to 5 are all close-ups of image 1

[Fossildude19]

Sole markings/tool marks sound correct.

 

[Rockwood]

3 minutes ago, Denis Arcand said:

 

Photos 2 to 5 are all close-ups of image 1

For some reason I was seeing 1 as being concave. This really scuttles my original thought. It is hard to imagine this variety of traces being on a single plate. Tool marks does seem like the best explanation. 

[Sagebrush Steve]

The vertical lines on this one feature seem too uniform to be geological, but I am no expert.

 

[Denis Arcand]

Maybe i am just seeing  things.  For the most prominent features , it look like current flowing in one direction (in red) , excepted where there are obstacles (in blue). This is in agreement with "tools mark",  I don't think we would see that with ichnofossils.  

 

 

Furthermore, the saw like features, could be form by water currents, the same features can sometime be seen on top of snow bank  formed  by wind. 

 

Edited Monday at 12:51 AM by Denis Arcand

[Denis Arcand]

Thanks everyone for helping me learn new things and vocabulary.

 

It's still an interesting rock with features I can now name.  

[Rockwood]

2 hours ago, Sagebrush Steve said:

The vertical lines on this one feature seem too uniform to be geological, but I am no expert.

A bryozoan with maculae on its surface touching briefly would probably do it.