Incognitian

The Incognitian Period is the oldest geologic period. Its name, meaning "unknown" or "unknowing", is representative of its dubious age. Rocks from this time period are virtually unknown, and only hardy zircon crystals are known to have survived from this ancient age.

The period is suspected to have began anywhere from 4.6 to 7.0 billion years ago.

Fraudster Burlare L. Menzogna claimed to have found and hosted in a private collection an alleged dinosaur from this period known as Mendacisaurus. The "fossil" was investigated by Rathnir Paleontological Society members and found to be made entirely out of marble. Menzogna was charged with fraud and arrested.