Thread: What is this rock?

My mother found this rock many years ago in a creek in Georgia. I haven't been able to find anything like it online. It's seems heavy for it's size which is smaller than my palm. Does anyone know what this rock is or what the lines in the rock are?

looks like a petrified egg of some kind. but I'm not a geologist or a paleontologist.

Could also be petrified sea plant of some sort. There was a sea "plant" that had structures like that millions of years ago when there still wasn't much oxygen around, and those things produced oxygen. They were about twice the size of your head and lived very close to the shore. I forget their names.



Ediacarans. Life forms that were very different to what we have now.

I do not know but maybe this link can help you find out.

Geological Society of America - Geoscience Links

It's fossilised coral

It's a petrified rock!

I agree with pyoko, its a water worn cobble with fossil coral in a softer matrix. The softer rock has been worn down faster then the harder silica fossil creating the ridged look.

Definitely not an egg or an Edicarian fossil ;D