So you have chosen to ignore that in our modern world population densities of living animals can reach the same population densities that you want to use to discount the Bible? Where is the science and truthfulness of this evasion?
If you cannot site an Internet source then site your book. You posted a statement that you cannot back up and the one source I found on the Internet you rejected. So far in my search creationist sites refer to the 800 billion fossils and then disprove this number. In other words I cannot find any source that supports yours.
I have not changed the topic, you posted that cave men or "stone age" cultures did not have the ability to build cities, which I have shown is not true. You appealed to the Karroo Formation and 800 billion fossils and an animal density of 21,000 per square mile. I have shown you that there is no evidence to back up the 800 billion and that animal densities today reach your 21,000 per square mile.
The only thing I asked of you is to site your sources, and extrapolate todays human population starting with 3 mating pairs either 70,000 or 250,000 years ago, which is only fair since your thesis has already been shattered.