The clubmosses and their relatives are the most ancient group of vascular plants ... trees during that period. In fact, much of our modern supply of coal is the fossilized wood of tree clubmosses. A ...

This time period took place 359 to 299 million years ... (359.2 million to 318.1 million years ago) and the later Pennsylvanian (318.1 million to 299 million years ago). During the Mississipian ...

Researchers have discovered an exceptionally preserved fossil site in Massachusetts that provides a rare glimpse into ...