"Progymnosperms" from North America

See images from the:

		Quaternary
		Tertiary
		Cretaceous
		Jurassic
		Triassic
		Permian
		Carboniferous
		Devonian
		Silurian
		Ordovician
		Cambrian
		Precambrian

Archaeopteris halliana
From the Devonian in Quebec
© 2008 Miguasha National Park, Quebec