Is this fossils or rocks? (First today! :))

[Nari]

I first learned about this forum today, and I was able to identify fossils that I had been curious about for a while. I was very happy.

 

I am recently interested in fossils, prehistoric creatures and dinosaurs. I will continue to receive help, and I will do my best to provide a lot of help.

There are a lot of stones I picked up by the river in my house, but some of them have holes. How can you distinguish between 'trace fossils' and 'just erosion' holes?

(Clockwise 1-2-3-4; stone 1 was washed with water before taking the picture.)

(1) Can you guess that these holes or curves are trace fossils?
(2) I wonder if this hole is characteristic of a particular fossil. Or could it be a coral or a sponge? Or is it just like basalt?
(3) I am not familiar with anatomy, but I am wondering if this is a bone. What do you think?
(4) As with the others, there are some holes and'traces' similar. I wonder if this can be viewed as a fossil.

thank you. It would be great if you could leave a simple comment.

 

[Tidgy's Dad]

The two on the left might be borings.

Can you see what it is in the main groove in the rock top left in the second photo? Is it a mineral or a bit of a shell? 

Top right looks igneous to me and bottom right seems to be eroded limestone, I think. 

[Nari]

12 hours ago, Tidgy's Dad said:

The two on the left might be borings.

Can you see what it is in the main groove in the rock top left in the second photo? Is it a mineral or a bit of a shell? 

Top right looks igneous to me and bottom right seems to be eroded limestone, I think. 

Thanks for your insgihts!

 

And here it is.

 

[Rockwood]

Sorry. My sense is that these are mineral inclusions which are more reactive with elements of the environment. They weathered away.

 

[Tidgy's Dad]

12 hours ago, Rockwood said:

Sorry. My sense is that these are mineral inclusions which are more reactive with elements of the environment. They weathered away.

 

Having seen these new photos, I agree.