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Ryhnchotrema capax & Ryhnchoterma increbescens Brachiopods from the Coburg Formation
One of the more common species of Brachiopod in the upper Ordovician is
. This genus of Ryhnchonellids are generally small and roughly triangular in shape with little to no hinge line. Two species are found in the Coburg formation,
. Their shell shape is the only easy way to tell them apart as both species have a sulcus with three folds, both have ornamental concentric growth lines, and both can be found in the same layers of the Coburn formation.
has a more rounded or rectangular form while
is very triangular and ends with a sharp beak on the pedicle valve.
Pedicle valve Anterior
The Coburg formation is Ordovician in age (late Ordovician, Katian/Mohawkian stage).
These fossils were collected from the St. Mary's Limestone Quarry in Bowmanville, Ontario. I used William Hessin's book "South Central Ontario Fossils", 2009, Self Published, pg. 130 to help identify these fossils.