Most fossil Cicadidae are known from the Cenozoic .
The oldest unambiguously identified specimen is Davispia bearcreekensis ( subfamily Tibicininae ) from 59 - 56 Ma .
Most fossil Cicadidae are known from the Cenozoic , and the oldest unambiguously identified specimen is Davispia bearcreekensis ( subfamily Tibicininae ) from 59 - 56 Ma .