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
The fusion of Nabatean, Hellenistic and Roman styles also characterizes the architecture of the region. "Hawrani"-style architecture is dated to at least the 1st century CE when the Nabateans moved their capital from Petra to Bosra. The Nabateans were avid builders with their own distinctive architectural tradition. After the Roman annexation of the Nabatean Kingdom in 106, the area experienced a building boom that lasted until the onset of strife and instability in the mid-3rd century. Though the Roman contribution was highly influential to the region’s architecture, the Hauran’s Nabatean inhabitants largely maintained their own building traditions, particularly in the smaller towns.