Here is a link to info about a huge stromatolite fossil:

Virginia Museum of Natural History scientists have confirmed that an approximately 500 million-year-old stromatolite was recently discovered at the Boxley Blue Ridge Quarry near Roanoke, Virginia. This specimen is the first-ever intact stromatolite head found in Virginia, and is one of the largest complete “heads” (of algae) in the world, at over 5 feet in diameter and weighing over 2 tons.

The oldest stromatolites have been dated at 3.46 billion years old.

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