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.

  BonePlate3a.JPG (63509 bytes) A partially eroded fragment, showing internal cancellous bone.


 BonePlate4a.JPG (65166 bytes)   BonePlate5a.JPG (66815 bytes)

Two fragments demonstrating tubercular surface ornamentation.

BonePlate6a.JPG (13538 bytes)

A fragnment recovered by dissolution of the matrix in dilute acetic acid.  Note ornamentation.

BonePlate7a.JPG (15316 bytes)

Possible jaw fragments, recovered by acetic acid dissolution of the matrix.

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Page last revised Feb. 4, 2009