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.
Hauran
From the mid-1st century BCE, the region was governed by the Roman Empire's Herodian and Nabatean client kings until it was formally annexed by the empire in the 2nd century CE. The Hauran prospered under Roman rule (106–395 CE) and its villages functioned as largely self-governing units, some of which developed into imperial cities. The region continued to fare well in the Byzantine era (395–634), during which different Arab tribes ruled the Hauran on Byzantium's behalf, including the Salihids (5th century) and Ghassanids (6th century) until the Muslim conquest in the mid-630s. For much of the Islamic era until Ottoman rule (1517–1917), the Hauran was divided into the districts of al-Bathaniyya and Ḥawrān, which corresponded to the Classical Batanea and Auranitis, respectively. Muslim geographers variously described these districts as prosperous, well-watered and well-populated.