Actinastrea sp. (D'Orbigny 1849)

beautiful!

Wow Roger, Very nice corals and presentation

Especially this one fits with you... A stars gathering

Thanks very much you guys. As we say in Germany: "Klein aber fein" which means "small but fine".

Super find Roger!

Peter

Thanks Peter!

I found something very similar to that south of Billings, MT.

If those are cretaceous layers it may very well be the same species, although many colonial corals look similar.