Hehe, I know
It's just ...huge. Just though it's worth mentioning such big calcareous concretions do exist.
Here's a pic:

Here is the address for an excellent article that cover everything in this thread

It's just ...huge. Just though it's worth mentioning such big calcareous concretions do exist.
Here's a pic:

Here is the address for an excellent article that cover everything in this thread
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