from the GSA JUNE GEOLOGY Dinosaur abundance was not declining in a "3 m gap" at the top of the Hell Creek Formation, Montana and North Dakota Peter M. Sheehan, David E. Fastovsky, Claudia Barreto, Raymond G. Hoffmann Abstract: <http://www.geosociety.org/pubs/geology/0600geo.htm#S11> Full text PDF: ftp://204.144.241.6/pub/geology/28-523.pdf (77 kb)