no, it was my impression that the majority of Basilosaurus were found in Louisiana where fossilized parts are often found and used in various ways, for household decorations, lamp pieces, etc,..
Alabama, Louisiana, Mississippi... the Atlantic coast of North America in general... quite a few sites, actually... and
most famously, Wadi Hitan in Egypt. So when talking about thousands of fossils, I guessed you meant in one place.
It's quite humorous to hear how ignorant you are
And I only read your posts for the laughs.
and assumed that they have been found only in one place in massive numbers
No, I did not assume that. 'Zeuglodon Valley' has many
Basilosaurus fossils, and is famous because of Gingerich's finds. All you had said was that there are thousands, and that's the most famous place to find lots of them. I
know they are found elsewhere.
As to why they are numerous (though I doubt 'thousands' -- please reference), it is simply that they inhabited shallow seas where beaching was likely.
But to return to your point: fossilisation is generally rare, because things get eaten and / or decompose before they make it into the rocks. But if the conditions are right, many things can become fossilised, as the cliffs at Dover show. I fail to see why this is difficult, or a difficulty for evolution.