Cryptic (geology)
The Cryptic era is an informal term for the earliest geologic evolution of the Earth and Moon. It is the oldest (informal) era of the Hadean eon, and it is commonly accepted to have begun close to 4533 million (about 4.533 billion) years ago when the Earth and Moon formed. No samples exist to date the transition between the Cryptic era and the following Basin Groups era for the Moon (see also Pre-Nectarian), though sometimes it is stated that this era ended 4150 million years ago for one or both of these bodies. Neither this time period, nor any other Hadean subdivision, has been officially recognized by the International Commission on Stratigraphy.
Conan the Barbarian
The various stories of Conan the Barbarian occur in the pseudo-historical "Hyborian Age", set after the destruction of Atlantis and before the rise of any known ancient civilization. This is a specific epoch in a fictional timeline created by Howard for many of the low fantasy tales of his artificial legendary.