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Dear Mike,
Here is an example from the Tertiary of Argentina,
with a good bibliographic review on the subject (quite a few references on
pearls related to Cretaceous inoceramids up to 1937!)
Frenguelli, J. 1937. Sobre una perla fósil del
Aonikense de Punta Norte en la Península de Valdez (Chubut). Notas del Museo de
La Plata (n.s.) II, Paleontología 11: 155-162. La Plata.
Best wishes,
Susana
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