@Ionus,
Quote: As all species have become extinct to 4 decimal places
That only means that for any specific order and genera, the extinction rate for species has been at four decimals. SOME DID GET THROUGH, IN most all cases, the GENERAL forms with many species in their genera were the successful ones. Thats just from sampling of continuous sequential stratigraphy. Earliest whale -like forms of precetaceans , were about 7 or 8 different genera and seveal species each all in the same evolutionary "Lab" of the present area from the ARabian penisnsula to the area that is now under thousands of feet of sediment along the Indian Ocean where India slammed into Asias belly.
Quote: where are the gaps in the fossil record...and we dont want an answer that anticipates where an IDer might take it.
There are plenty of gaps, most of them seem to occur where a species buds off ferom its common ancestor with other orders or genera.
We know that there were about 7 or 8 orders of mammals that exosted before the KT extinction. Only 3 made it through. The marsupials, monotremes, and placentals. We have fossil evidence of this "root stock" but there are thousands of species after that, that we have little or no record qat that critical time when they first presented themselves . For exampl,e, BATS, we know that bats are insectivore placentals and we have the most general placental insectivore form from the PAleocene and Eocene. After that, and until the late Miocene, we dont have any Bats fossils, then all of a sudden we see fossil bats in the stratigraphic record. The fact that bats dont have a preferred ;location and we only know them from their present configuration, weve lost any connection to stratigraphy. SOme fossils of bats were reported from The early Miocene in China but the entire section of late Eocene tthrough Oligocene is missing in sveral parts of the earth due to erosion and subduction. This often cleans off any possibility to find fossils of a species that someone is tracing
Quote: Have you decided no discussion is necessary, we all should all turn off the computers and read a book ?
I dont think that anyones chatting on a computer constitutes lerning. I am only regurgitating from my experience and training and I dont profess to have all the information on a specific question. When I suggest that one pursue a text that specifically addresses the question at hand, I usually say THANKS A LOT (because it has saved me some useless jawbone time).
The very rules of species numbers being directly proportional to survivability of a genus has been tackled by several paleoecological mathematicians whove looked at population dynamics from fossil data and arrived at some nifty conclusions (like the 99.9999 % extinction rate for all species ever living at any time). RAup does it reall well because he doesnt get lost in the statistics and he attempts to do the teaching in a very readable form. It will really be your loss NOT to find this book and read it. Its a very quick enjoyable read, and it shows that one can be a great educator and still make the trip enjoyable .