Recent worldwide studies of delta formation indicate that deltas began about 8000 years ago (i.e. 6000 BC) when sea level rise began to slow down. In other words the vast fertile plains that were necessary for the beginning of agriculture did not exist before say 6000 BC, and were in the stages of active formation for some time after that. Here is how San Francisquito Creek would have appeared during this era.
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Copyright 1996 Kirribili Press. Return to Scientific Summary Chronological Index Ignatius Donnelly and the End of the World