Those may be stromatoporids, which were important reef building sponges during the Silurian-Devonian. They have distinctive mounds, called mamelons. That is just a guess though. If you have any locality data or evidence that this comes from the Silurian or Devonian, that might be helpful.

Is that a horn coral? In Ireland?

think so 🙂

So online it looks like these rocks belong to the Central Clare Group and are 320-317 Ma (part of the Carboniferous). The fossil here is probably a solitary coral judging by the ridges and what appears to be a lack of valve. If there was a valve, it would be a brachiopod.

Is it in a big crack in the parent rock? I’m not an expert but it looks like an igneous intrusion. Magma was being forced up from the mantle into the crust, and it pushed its way into fractures like the one shown here, then cooled to form this rock that stands out compared to the other rocks. Just a guess!

thx :)))))))))

I see a spiral in the one at the top of the picture that makes me think ammonite. The other ones don’t look like ammonite though not sure

Looks like a lot of corals in the matrix, could be horn coral but I’m not sure

thx 🙂

duplicate

It looks like a fish scale of some sorts

These look like bryozoans.

Coral?

Looks like a flabellum coral

Looks like a flabellum coral cross section

It could be a worm tube or some other kind of trace fossil

Some kind of trace fossil footprints or animal track. Very interesting, I’m not sure what kind of animal it is but you can research the age of the rock and then what animals lived in the area at the time and try to find a match.

ok, i’ll try to do that. thank you