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Rib Bone With Growth Rings?


uscedisto

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I initially thought this was a dugong rib bone but it has what looks like growth rings running through it. Dugong ribs don't normally have these rings so I was wondering if this might be something else. Found in the lowcountry of SC at a Pleistocene site.

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It is a sirenian rib, If you have any miocene working into your deposit then it is dugong.

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I've found sirenian ribs like this too, definitely dugong for me. Anyone know how to tell how old it was from them?

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Aging sirenians is difficult, there has been research and testing to try and determine age from the growth rings. From the papers I have read, there isn't a way to determine exact age from the growth rings. Density of the ribs can tentatively determine an age. Age of Trichechus manatus is determined by the total body length of the individual. With a base body length for calves, sub-adults, and adults.

Edited by calhounensis
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