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RE: What did Spinosaurus eat? New species of Lepidotes found
On Sat, February 26, 2011 4:03 am, John Hunt wrote:
> Surely extant crocodilians could test this. Some eat mostly fish, some
> hardly any.
A problem here is that absolute values of oxygen isotope ratios aren't
necessarily comparable outside of possible diagenetic change.
The best protocol to use is to sample individual fossils from the same
horizon of the same quarry of the same formation: this greatly reduces the
chance that the differences between values are due to slight variations in
preservation rather than what we are looking for: the actual distinction
between different isotopic ratios in life.
Thomas R. Holtz, Jr.
Email: firstname.lastname@example.org Phone: 301-405-4084
Office: Centreville 1216
Senior Lecturer, Vertebrate Paleontology
Dept. of Geology, University of Maryland
Faculty Director, Science & Global Change Program, College Park Scholars
Mailing Address: Thomas R. Holtz, Jr.
Department of Geology
Building 237, Room 1117
University of Maryland
College Park, MD 20742 USA