Large Placoderm Bone Plates
These fossils from the North Evans Limestone probably represent placoderm fish armor and jaw plates. Scale in each image has 1 cm divisions.
A partially eroded fragment, showing internal cancellous bone.
Two fragments demonstrating tubercular surface ornamentation.
A fragnment recovered by dissolution of the matrix in dilute acetic acid. Note ornamentation.
Possible jaw fragments, recovered by acetic acid dissolution of the matrix.
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Page last revised Feb. 4, 2009