“The Miracle Planet” by Bruce Brown and Lane Morgan and it says that “Four hundred million years ago a warm ocean covered the Guangxi region of China” (Brown, p. 104).
The Guangxi Province is famous for these rounded hills, with 70,000 of them clustered along the Li River in Southern China. Limestone which has been eroded in this manner is referred to as karst.
When the book says400 million years ago that translates into the first ‘half’ of the Flood.
It would be after the initial break-up and initial catastrophic cataclysm, but well before the waters reached their peak. They may have decided this ‘age’ based on the fossils, or they could have decided it by its relationship with other rocks in China, or both.
When they say “warm” it may be because of the limestone that was being deposited. They typically imagine the limestone came from the breakup of coral reefs which grow in warm oceans today. However, the connection with coral reefs is not likely to be the whole story during the Flood. It is more likely that the limestone was mostly chemically deposited at that time. If the water at the time was indeed warm, that may have been because of the volcanic eruptions that occurred at the beginning of the Flood. However, it is possible that it may not have been warm but the environment has been misinterpreted.
There would have been more sediment deposited on top of these rocks as the Flood continued to rise (including sediments in central China where they are finding dinosaur fossils). Eventually the Floodwaters would have peaked, after which they would have started to recede from the continents into the newly-forming ocean basins.
This receding water during the second ‘half’ of Noah’s Flood would have eroded the sediment from the top of the continents, likely kilometres of sediment as is evident in other parts of the world.
The remarkable landscape with its rounded hills was carved by these receding floodwaters. The hills were likely eroded in an area where there was a change in the elevation of the land surface. Imagine the water flowing toward the ocean over the interior plateau and then dropping to a lower elevation. A hydraulic jump forms in the area where it drops, generating a region of aggressive erosion.
As the water level dropped, corrosive fluids moved through the limestone and dissolved out the caves. Thus, the main cavern spaces most likely formed late in the Flood, and the interior decoration (stalactites and stalagmites) formed after the Flood due to groundwater seepage in the post-Flood period.
So that is a brief explanation in a broad sweep."
CMI
The Guangxi Province is famous for these rounded hills, with 70,000 of them clustered along the Li River in Southern China. Limestone which has been eroded in this manner is referred to as karst.
When the book says
It would be after the initial break-up and initial catastrophic cataclysm, but well before the waters reached their peak. They may have decided this ‘age’ based on the fossils, or they could have decided it by its relationship with other rocks in China, or both.
When they say “warm” it may be because of the limestone that was being deposited. They typically imagine the limestone came from the breakup of coral reefs which grow in warm oceans today. However, the connection with coral reefs is not likely to be the whole story during the Flood. It is more likely that the limestone was mostly chemically deposited at that time. If the water at the time was indeed warm, that may have been because of the volcanic eruptions that occurred at the beginning of the Flood. However, it is possible that it may not have been warm but the environment has been misinterpreted.
This receding water during the second ‘half’ of Noah’s Flood would have eroded the sediment from the top of the continents, likely kilometres of sediment as is evident in other parts of the world.
The remarkable landscape with its rounded hills was carved by these receding floodwaters. The hills were likely eroded in an area where there was a change in the elevation of the land surface. Imagine the water flowing toward the ocean over the interior plateau and then dropping to a lower elevation. A hydraulic jump forms in the area where it drops, generating a region of aggressive erosion.
As the water level dropped, corrosive fluids moved through the limestone and dissolved out the caves. Thus, the main cavern spaces most likely formed late in the Flood, and the interior decoration (stalactites and stalagmites) formed after the Flood due to groundwater seepage in the post-Flood period.
So that is a brief explanation in a broad sweep."
CMI