The study of dinosaur abundance in the Hell Creek Formation by Sheehan et al. (2000) raises three points that require comment. Additionally, some of their history of the “3 m gap” requires emendation. As the authors correctly state, in the late 1970s and early 1980s various workers observed that dinosaur remains seemed to be absent or rare in the upper 3 m of the Hell Creek Formation in northeastern Montana. As Sheehan et al. note, this was subsequently seen as a geographically wider phenomenon. It must be emphasized that this was first noted before the 1980 publication of the seminal...

First Page Preview

First page PDF preview
You do not currently have access to this article.