About 4,500 years ago, the African continent was entirely covered with water. We know this is true because humans witnessed the event, recorded what they saw, and the document they wrote is available to us today. About that water and its depth that account reads:
For forty days the flood kept coming on the earth, and as the waters increased they lifted the ark high above the earth. The waters rose and increased greatly on the earth, and the ark floated on the surface of the water. They rose greatly on the earth, and all the high mountains under the entire heavens were covered. The waters rose and covered the mountains to a depth of more than twenty feet. (Genesis 7:17–20)
This was a period of great sedimentation on the earth, especially on the parts of the crust that now form the continents.
Once the waters of the Flood had completely inundated every piece of land on the earth, they began to recede, and they continued to recede for a period of about seven months, until the continents were dry. Where did the waters go? They flowed into the ocean basins which were widening at the time, or deepening, or both.
Geologists actually catch hints of this event but their interpretive framework, especially the dates they have assigned, prevents them from making the connection. For example, they speak of a time when the Indian and Atlantic Oceans were ‘born’—of the break-up of Gondwana. The ‘birth’ of these oceans provided the place for the waters to go:
The break-up of Gondwana began with the opening of the Indian Ocean along the African east coast, heralded by the eruption of basalts and rhyolites of the Lebombo region.1
This is the first hint of geological changes to the ocean basins, needed to receive the floodwaters. According to their evolutionary thinking it was some 180 million years ago, but in reality that translates to about ‘half way’ through the Flood. Here is another quote:
Some 120 million years ago, South America began to detach from Africa, opening rifts along the southern African west coast. This thinned the continental crust: the start of the Atlantic Ocean.2….
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