Fossilien / Fossils / Fósiles > Unbekanntes Erdzeitalter / unknown geological era

IS THIS A FOSSIL? ID HELP.

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Monika Kertowska:
Hello. I am a mineral collector living in Ireland and author of the blog collectingminerals.blogspot.com. A friend of mine, a German collector, recommended this website to me for fossil ID.
While being on a walk by Blackwater River in Mallow, Co. Cork, Ireland today, I found this stone that looks like a fossil. It was there among regular river pebbles, and it was the only one like this that I found.
On top it is rounded and covered with something that looks like the inside of a shell. The bottom also shows some of it, but is mostly a rock with visible layers. The whole thing just looks like a big, hand-sized oyster or mussel. Could you please help me identify if this is a fossil at all, and if so- what is it?
Any help greatly appreciated. Please, find pictures attached.
Monika

Axinit:
Hello,

might indeed be an oyster - difficult to tell from the pictures. It would be helpful, if you could provide some info as to the geological setting - Ireland is a bit far away from continental Europe.

MINERALIENATLAS is a phantastic place to exchange/obtain information on minerals, rocks etc and fossil wood  ;D.

The experts at Steinkern.de. are more likely to be able to answer your question - give it a try !

Good luck and best wishes

Harald

Monika Kertowska:
Hello and thank you for your reply.
The area where I live is limestone, I find fossils quite often here (shells, corals). I`m a mineral collector but always take the fossils that I find for reference and sentimental reasons :P Also, I like to know what I have ;)
I believe I`ll find someone here who will be able to tell me something about my stone.
Greetings,
Monika

stoanklopfer:
Yes, seems to be the shell of an ostrea.

harzgeist:
According to the geological map of Ireland the questioned object has been found in an area of Lower Carboniferous limestone.
Possibly a big brachiopod, like gigantoproductus ??
Can someone of the fossil-specialists (I'm not such!) confirm/deny this assumption ?

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