Paradox of drilled devil’s toenails: taphonomic mixing obscures Cretaceous drilling predation in Utah oysters. Ashley Ferguson Leif Tapanila Idaho State University. Pycnodonte Newberryi oysters. Left Valve. “Devil’s toenails” Large convex left valve Thick toward the umbo Flat right valve
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Idaho State University
Pycnodonte life position on sea floor.
Left valves dominate N = 89%
Individual localities range from 80-100%
BW U1 is an exception with up to 70% right valves.
Most specimens are in the ~50% fragmentation class.
Post-mortem Entobia and Caulostrepsis drillings affect ~14% of the assemblage.
Oichnus borings affect 1-4.2% of Pycnodonte shells on average.
Only two drilled right valves found.
MIXED SHELL POPULATIONS!