In geological time the Eon is larger than the Period. The Eon is the largest division of geological time recognised by the International Commission of Stratigraphic.
The ICS have divided the time as such from largest to smallest.
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Eon, Era, and Epoch: APEX :D
The Cretaceous period was part of the Mesozoic era.
The end of the Permian period marked the end of the Paleozoic Era and the beginning of the Mesozoic Era.
We are currently in the Quaternary Period of the Cenozoic Era.
We live in the Quaternary period, which is part of the Cenozoic era.