What are these rocks/fossils?

[pilot]

Hello readers.
I don't know much about rocks and fossils, but I am interested. I have found these (to me) interesting rocks. I am curious what they are, I have got no idea. Two of the rocks contain fossils.
Photo 1 I found next to a building, in the Netherlands, on a gravelpath, so that is not the original location.
Photos 2 and 3 I found in Denmark.
Photo 3 contains no fossil, but contains holes from gass bubbles? Any ideas about the origin? Volcanic?

I hope you guys can help.

[paleobear]

The second picture looks like the section of a rugose coral to me.

[pilot]

paleobear wrote:
The second picture looks like the section of a rugose coral to me.

Thanks paleobeer.
I have been googling rugose coral when I read your answer, and seen several pictures. Looking at them I think you must be right. Its nice to know.
Any ideas on the other rocks?

[paleobear]

Give us higher resolution pictures for the first one.

[pilot]

Hello paleobeer (Tommy) and others.
These are more close-up pics of the fossils in the first stone.
Hope they are clear enough for you all to identify.

[webmaster]

I think these are sections of crinoid stems. Often after the death of the animal the sections op the stems get separated. The calcium skeletons fossilize very well.

[pilot]

webmaster wrote:
I think these are sections of crinoid stems. Often after the death of the animal the sections op the stems get separated. The calcium skeletons fossilize very well.

Thanks webmaster.
Nice to know, I will try to find out more about crinoid stems.

[0dinofthenorth]

I'm not sure but the last one could be a meteorite.

[masteroffossiles]

last one is what we call here 'vuursteen' litteraly translated it means firestone but i dont know if that's the right english name for this kind of stone.
greetings,
sander

[Elbert]

Hi, he means flint.
greetings, Bert