# Sedimentary rock strata covering large areas seldom contain more than one major sediment type, i.e. sandstone, claystone, or limestone. How would it have been possible for just one type of sediment to be deposited over large areas for thousands of years, followed by thousands of years of another type and so on? Obviously, the sediments were not deposited over thousands of years each, but were contained in moving waters and sorted out during major flooding. This kind of sorting has been proved by Guy Berthault's experiments and by observation of flood deposits in Colorado in 1965, flood deposits at Mount St. Helens in the 1980s and others. John Baumgardner et al showed that megatsunamis over 2 km high would have been capable of rapidly eroding undersea continental slopes and depositing it over large continental areas in weeks to months. An asteroid swarm would have been capable of causing such tsunamis by tidal action. See Genesis and Historical Geology: A Personal Perspective GUY BERTHAULT <ref>http://creation.com/images/pdfs/tj/j12_2/j12_2_213-217.pdf</ref> Also <ref>http://sedimentology.fr</ref> and Noah’s Flood: The Key to Correct Interpretation of Earth History <ref>https://www.socalsem.edu/noahs-flood-the-key-to-correct-interpretation-of-earth-history</ref> | # Sedimentary rock strata covering large areas seldom contain more than one major sediment type, i.e. sandstone, claystone, or limestone. How would it have been possible for just one type of sediment to be deposited over large areas for thousands of years, followed by thousands of years of another type and so on? Obviously, the sediments were not deposited over thousands of years each, but were contained in moving waters and sorted out during major flooding. This kind of sorting has been proved by Guy Berthault's experiments and by observation of flood deposits in Colorado in 1965, flood deposits at Mount St. Helens in the 1980s and others. John Baumgardner et al showed that megatsunamis over 2 km high would have been capable of rapidly eroding undersea continental slopes and depositing it over large continental areas in weeks to months. An asteroid swarm would have been capable of causing such tsunamis by tidal action. See Genesis and Historical Geology: A Personal Perspective GUY BERTHAULT <ref>http://creation.com/images/pdfs/tj/j12_2/j12_2_213-217.pdf</ref> Also <ref>http://sedimentology.fr</ref> and Noah’s Flood: The Key to Correct Interpretation of Earth History <ref>https://www.socalsem.edu/noahs-flood-the-key-to-correct-interpretation-of-earth-history</ref> |