Scholars were able to disprove Velikovsky's time frame, by showing that reliable ancient astronomical charts show that Venus was in its present orbit well prior to 1500 BC. Using that fact, they were able to throw out Velikovsky's entire Venus/cometary model, which I think was unfortunate.
Michael,
That is simply not true. Your are a victim of the mainstream disinformation campaign against Velikovsky. Velikovsky made mistakes but this was not one of them.
I assume that you are referring to the so called "Venus Tablets of Ammizaduga" which are a Babylonian record of the movements of planet Venus. No mythology or interpretation, the tablets are a straight forward record of observations of the disappearances and reappearances of Venus over a 17 year period.
They have been cited by critics of V as evidence that Venus was in its present position as early as 3000 BC. However, most scholars date them to the 1st Millenium, probably around 800 BCE.
Well it stands to reason that any debate on the date of the tablets can be established through retrocalculation. The fact of the matter is that uniformitarian scholars who have attempted such retrocalculations could only achieve a "fit" by changing the dates and alleging that they were correcting "scribal errors." Other uniformitarian scholars declared the observations to be impossible and unreliable. Of course, that is because this is an actual record of Venus on a different orbit than today. Lynn Rose and Raymond Vaughn have done extensive analysis of the tablets, with several papers published in various catastrophic journals.
Ironically, these observations which are often touted as falsifying Velikovsky's theory actually are a strong piece of evidence in support of that theory. At least to the extent that it is a record of Venus moving on a different orbit than today.
The bottom line is that Velikovsky's analysis in Worlds In Collision (1950), Chapter 10, pp 198-200 stands as written.
As a side note, I would not put any value on the proposed catastrophe(s) dated at 11,000 years before the present. That date is derived from radiocarbon dating which has no value as it has an implied uniformitarian assumption, ie that carbon levels have remained constant. Velikovskian type catastrophes would by their very nature require the dumping of immense amounts of carbon into the atmosphere affecting the amounts absorbed by plants and animals.