Folio notes
Ink editDescription
Late Triassic
capable of precise maneuvering and rapid directional changes
Why are trilobite fossils so common
air-filled bones reduced weight without sacrificing strength
and plant diversity in North America
2.4" Annularia Fossil Leaves Mazon Creek Nodule Pennsylvanian Age Split-Pair Mercenaria Late TriassicLocation: Francis Creek Shale Formation, Illinois Weight: 6 Ounces Dimensions: 2. 9 Inches Long, 2. 3 Inches Wide, 0. 9 Inches Thick (Nodule) Leaf Dimensions: 2. 4 Inches Long, 2. 3 Inches Wide The item pictured is the one you will receive. Pensylvanian Age, 370 million years ago Annularia Fossil Leaves The Mazon Creek fossils date back to the Pennsylvanian sub period (roughly 307 million years ago). During this time, the area was a tropical delta
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