Predicted weight was determined by using the least square correlation line between measured weight and length cubed for good and excellent specimens. Since these specimens presumably did not lose much weight they were used to estimate the relationship between weight and length for unaltered valves.
Chione cancellata valves from the Lower Zone lost negligible amounts of weight, while the Upper Zone valves lost an average of approximately 15% of their original weight. The greater weight loss indicates more alteration of specimens from the Upper Zone.
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