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Climate, Culture, and Catastrophe in the Ancient World (1440 words) |
 | This was the beginning of the Younger Dryas, (10500 BC) a millenium in which the circulation system of the North Atlantic went into a kind of planetary fibrillation, the African monsoons migrated southward, drying the desert. |
| BP (6000-3500 BC) at which time the temperature is warming culminating in an era warmer than present, when equatorial weather patterns may have reached farther north than at present, and the westerly storms of the north would have been confined to latitudes higher than at present. |
| By 4500 BC the favorable climatic conditions and stabilized lower alluvial plains favoring territorial control and mound building (4500 BC) among native Amercan groups in the lower valleys. |
| 3000bc (5257 words) |
| BP (6000-4000 BC) at which time the temperature is warming culminating in an era warmer than present, when equatorial weather patterns may have reached farther north than at present, and the westerly storms of the north would have been confined to latitudes higher than at present. |
| At about 3500 BC the lower Tigris and Euphrates alluvial plain was under extreme pressure from both rapidly rising sea and buildup of the Karun delta. |
| The 3199 BC value is associated with an acidity peak in Camp Century ice cores dated at 3150 B,c demonstrating unquestionably that adverse weather conditions, probably due either to volcanic eruption or meteoric impact, occurred at this time. |
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