The Search for What Killed the Dinosaurs
A friend of mine is an avid fan of The Teaching Company and recently sent me a link to one of their current free lectures: The Search for What Killed The Dinosaurs. Thanks Edward!
The name of the lecturer (Peter Ward) sounded familiar so I checked my shelf and, sure enough, I have a book of his on this topic called "Gorgon". The book and the lecture are both great, so I recommend them.