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Dates and phylogenies (was RE: Campbell's even crazier than a MANIAC? ...)



> From: owner-DINOSAUR@usc.edu [mailto:owner-DINOSAUR@usc.edu] 
> On Behalf Of Erik Boehm
>
> For that matter if Archie was Mid Jurassic, 

Late Jurassic. In fact, younger than most of the Morrison dinosaurs

> and Micro is 
> Early Cretaceous, should much emphasis be placed on Micro at 
> all (other than evidence that dromeosaurs may have been 
> mainly just early 2ndarily flightless birds)

Microraptor is important because it is the most completely known basal
dromaeosaur. Additionally, traits shared between it, Archaeopteryx, definite
members of Avialae, and basal Troodontidae are likely present in the
concestor of all eumaniraptorans, and thus relevant to the ancestor of
birds.

Thomas R. Holtz, Jr.
Email: tholtz@umd.edu   Phone: 301-405-4084
Office: Centreville 1216                        
Senior Lecturer, Vertebrate Paleontology
Dept. of Geology, University of Maryland
http://www.geol.umd.edu/~tholtz/
Fax: 301-314-9661               

Faculty Director, Earth, Life & Time Program, College Park Scholars
http://www.geol.umd.edu/~jmerck/eltsite/
Fax: 301-405-0796

Mailing Address:        Thomas R. Holtz, Jr.
                        Department of Geology
                        Building 237, Room 1117
                        University of Maryland
                        College Park, MD 20742 USA