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RE: Herrerasaurus ... again
> From: owner-DINOSAUR@usc.edu [mailto:owner-DINOSAUR@usc.edu]
> On Behalf Of B tH
> Does anyone know of any recent work done on the "direct"
> ancestor of this early dino?
> I'm intrigued by this guy because he was so (relatively) big.
> If H is considered one of the earliest known dinos, then
> there must be something still in the ground or undescribed at
> this point that indicates a smaller, earlier form, right?
Herrerasaurus, Eoraptor, Panphagia, and Pisanosaurus are all the same age,
and indeed from the same unit. At present there are know dinosaurs known
which are definitively older: they must exist, but haven't been found yet.
There are some intriguing footprints from Argentina in the Middle Triassic
that *might* be dinosaurian, but they could be from a close sister group (or
from yet another damn dino-mimic among the crurotarsans... No evidence for
that yet, but you can't trust those stem-crocs ;-).
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, Earth, Life & Time Program, College Park Scholars
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