paleonet Length as a proxy for age

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Hi
I am presently working on a growth series analysis for a group of animals 
who's growth strategy is still unknown. I was hoping to use the length of a 
specific character as a proxy for age. I understand that this is traditional 
practice in paleontology, and I would like to document other instances in 
which the length of a feature was used to indicate its age.

Does anyone have any examples of instances where length was used as an age 
indicator? this would be particularly interesting if i could include 
examples from various groups of fossils (vertebrates, invertebrates, 
plants...).

Thanks for the help,

Marc

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