Over the years, any theory concerning the cause(s) of the mass-extinctions at the KPg boundary has been criticized and attacked both friendly and unfriendly. Such is often the case in high-visibility science, and the Extinction of the Dinosaurs is in that respect in category 1 !

On these pages the KPg boundary debates are treated in a sort of chronological order. 
I found myself often in the middle of these arguments. Over emails, conference sessions, etc. So I am, I wholehartedly admit, not entirely un-biased. I try to be as objective as possible, but sometimes you can just hear my teeth grinding from these pages!

Initially, early in the 70's, the discussions centered on gradual vs catastrophic extinctions, parallel to the discussions between phyletic gradualism and the punctuated equilibria of Eldredge and Gould. Most Vertebrate paleontologists opposed the idea of a sudden extinction. See papers by Archibald, Sloan and Van Valen. On the other hand most micro-paleontologists, especially specialists on nannofossils and planktic foraminifers like Hans Peter Luterbacher and Isabella Premoli Silva, embraced the idea quickly.

Arguments for a catastrophic extinction have been brought forward since Schindewolf in 1954 (see also Newell, 1952). O. H. Schindewolf, like G. K. Gilbert, Had an opinion about almost every geological subject, so also about mass-extinctions.

Summarizing, the opposition against a single asteroid impact causing a mass-extinction usually stems from a single aspect of the whole KPg impact-extinction theory that -according to its proponents- is not in agreement with the theory and therefore would invalidate the whole theory. I will try to defuse such a simplistic attempt to defuse he whole of the impact extinction theory.

After all, we all want to now what is really going on!

a) Gradual extinction (1988)
b) Multiple impacts
c) Chicxulub impact preceding the KPg boundary mass-extinction
d) Dolomite crystals and planktic foraminifers
e) Deccan traps and the KPg boundary
f) Keller-Smit debates online first CCnet, then geological Society
g) Other, short issues

And, here, what Dutch newpapers have to say (in dutch!)

See also Gerta Keller's Webpage!

More Links to interesting stuff

I'VE GOT A BONE TO PICK WITH YOU, SAY FEUDING DINOSAUR EXPERTS (from the Observer)

NO DINO BONES ABOUT IT: DEBATE ALIVE AND KICKING (USA Today Kicks in

See what the Economist (fri 7 Nov) Has To Say

The New York Times likes triple impacts

Parallel discussion :Tyberg, Keller, Stinnesbeck >>here<<

Parallel discussion Marcus Hartings >>here<< , and Smit's >>here<< answer to M. Harting