I have noted of late your consideration of a 'mud flood' that you suspect may have affected much of the world fairly recently. I am not telling you what did or did not happen, and strongly agree with your assessment of history books, so please consider my remarks as simply information I am aware of.
I have been through a couple floods. I also have a friend whose family farm is in a flood plain, and it floods every couple years. In the floods that inundated my home, I found it notable (and highly obectionable) that after the water receded, despite the violence of the flow initially, it receded gradually, and gently. As a result, it left a residue that had washed out of the places the water came from - mud. A layer of mud about an inch deep, fine and utterly ubiquitous where the water had reached.
The farm where my friend has experienced ~20 floods in the last century shows the result of a couple dozen such depositions, a layer of mud almost two feet deep. There are Model T and Model A cars and trucks (he once was a restorer) that are buried up to the hubs in this fine, clay like mud, now dry.
You'd think there would be indications that a few years had passed between floods, a demarcation like the rings in a tree, in the mud, but it is practically without division clear into the subsoil. The floods occurred long before the farm existed on the flood plain, and the layer of human deposited material can be used to date the floods. He can point out differences in the depth of the mud on a given item, recalling when the item was placed there, and point out how much mud was deposited by that flood (if he had left another item before the prior flood, but after the preceding one).
The point I am trying to make is that myriad local events that reoccur regularly may resemble one global event.
I have seen the Badlands across Montana, and see what a raging flood does when it happens all at once. The ripples and moguls you find on a beach where a creek dumps out are there, but they are miles wide, hundreds of feet high. I do not see that such a regional event could be global without relatively scaled landscape features, so do not see that some kind of recent global flood that could leave feet of mud deposits could have occurred.
However, if myriad local floods occurred over centuries since an area was developed, feet of mud would certainly be the result, and massive flow features left in the landscape would not be evident. This seems to conform to the data you are considering.
Thought I'd provide such information to you as I am able.
I greatly enjoy your broadcasts when I am able to hear them (less often of late due to bandwidth issues), and agree with your underlying ethic: to consider the evidence and draw conclusions as best you can.
That's science.
Thanks!