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Re: Everything you know about the Iren Dabasu age is wrong...
> Iren Dabasu has at least one dinosaur in common with
> the Baynshirenian beds of Outer
> Mongolia-Alectrosaurus. There is no doubt that the
> Baynshirenian beds far underlie the Nemegt.
Except, of course, that the Bayn Shire small tyrannosaur material hasn't
been demonstrated to actually come from Alectrosaurus olseni, which is at
present a poorly diagnosed taxon.
>> The distance can be three miles and still indicate
>> a drastic change in
> Nemegtian taxa were very wide ranging. Tarbosaurus
> occurs in southern China, well south of Iren Dabasu
> where Alectrosaurus is known. The absence of
> Tarbosaurus there, like the absence of Mesolanistes,
> and Mongolemys etc argues against a Nemegtian age.
Actually, given that the Iren Dabasu has had far from a great number of
field seasons, I would be cautious about saying what's really there.
Much like I would be cautious about dismissing the stratigraphic
conclusions of a paper prior to reading it. (Yes, I admit: I'm pretty
skeptical. But let's see what they have to say!)
Thomas R. Holtz, Jr.
Senior Lecturer, Vertebrate Paleontology
Department of Geology Director, Earth, Life & Time Program
University of Maryland College Park Scholars
Building 237, Room 1117
College Park, MD 20742
Phone: 301-405-4084 Email: firstname.lastname@example.org
Fax (Geol): 301-314-9661 Fax (CPS-ELT): 301-405-0796