- In the Neolithic, 10,000 years ago, this entire shore would have been underwater. At that time, the coastline was two meters higher. This wet period brought the first known occupation of Qatar and archaeologists occasionally find the dark brown rock tools of the people who took advantage of this brief climactic window—and the concurrent flourishing of life—to spread across Arabia.
- Calymmian (Wikipedia)
The Calymmian Period (from Ancient Greek: κάλυμμα, romanized: kálymma, meaning “cover”) is the first geologic period in the Mesoproterozoic Era and lasted from 1600 Mya to 1400 Mya (million years ago). Instead of being based on stratigraphy, these dates are defined chronometrically.