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Excellent: Shell nacre shiny, no chipping or abrasion, no boring, sharp ornamentation, hinge teeth undamaged | |
Good: Somewhat more abraded, minor chipping, minor boring, hinge teeth undamaged | |
Poor: Heavily abraded, some chipping, hinge teeth potentially damaged, minor boring, ornamentation indistinct | |
Bad: Very heavily abraded, major chipping or breakage, ornamentation and hinge structures very indistinct, major boring |
Chione cancellata valves from the Lower Zone were more likely to be in good or excellent condition than valves from the Upper Zone.
The worse condition of valves from the Upper Zone indicates that valves from this zone were more taphonomically altered than those from the Lower Zone.
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