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Alethopteris sullivantii (Lesquereux) & ?Americlus americanus (

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Here is a nice plant fossil concretion with a tree fern of the species Alethopteris sullivantii and a piece of petrified wood. The is also a crustacean fragment that is might belongs to Americlus americanus. (Better known under the synonym Cyclus americanus Packard, 1885)

	Location:	Mazon Creek, Braidwood, Illinois , USA
	Size of concretion :	about 56 x 49 mm
	Age:	Upper Carboniferous, Pennsylvanian , Carbondale Fm. (about 300 Ma)

Product no.: 8673