7934 Mazo-IMG_2918

Carboniferous Vertebrate Eggs


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Product Description

Mazonova helmichnus
Mazon Creek Biota
Middle Pennsylvanian (Westphalian D)
Francis Creek Shale Member, Carbondale Formation
Will County, Illinois, USA

Extremely rare and unusual vertebrate egg cluster in paired concretion. 30mm in 44mm concretion. See: Shabica and Hay p. 279