Brief summaries of the main conclusions of the leading presentations are given below for those who may find the complete articles too long or technical.
Evolution of life is assumed to have taken place during that time.
This scenario contrasts dramatically with the biblical creation account which proposes that life on earth has existed for only a few thousand years. On the other hand, some other time-dependent processes change at rates which challenge generally accepted geochronology. Rivers carry sediment to the ocean at a rate that would fill the oceans at least 19 times over in 3500 million years, yet oceans are still very empty. Attempts to explain this by recycling sediments into the crust of the earth by various mechanisms are not very satisfactory. Present rates of sediment formation indicate that there should be 14 to 23 times as much as is found.