2.4" Annularia Fossil Leaves Mazon Creek Nodule Pennsylvanian Age Split-Pair Coloborhynchus Group: Brachiopoda

Group: Brachiopoda

divided into internal chambers by walls known as septa

Their fossils have been recovered from Montana’s Judith River Formation and corresponding formations in Alberta

barite can form tufaceous mounds through the buildup of deposits from hot springs rich in barium

providing protection from rivals and prey

2.4" Annularia Fossil Leaves Mazon Creek Nodule Pennsylvanian Age Split-Pair Coloborhynchus Group: BrachiopodaLocation: 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