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Re: US Fossil Collections
>But,last year someone discovered dinosaur tracks in China. They were
>found IN TERTIARY ROCKS (my emphasis). Last I heard they were going to
>close the case this year. Life definately survived in areas of the world
>where the fewest problems affected their life. Not one single cause did
>in most of the life at the time. It was many causes.
Tertiary by what definition? Last I heard, there were dinosaur tracks
found in China that were a meter or two BENEATH some Paleocene mammals. As
Peter Sheehan and others have pointed out several times on the net, a meter
of terrestrial deposit can sometimes represent tens of thousands of years,
because of erosion, periods of nondeposition, etc.
There may be new evidence out, but I still have not heard of nonavian
dinosaurs defintively above unquestionable Paleogene markers.
Thomas R. Holtz, Jr.
Vertebrate Paleontologist in Exile Phone: 703-648-5280
U.S. Geological Survey FAX: 703-648-5420
Branch of Paleontology & Stratigraphy
MS 970 National Center
Reston, VA 22092