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Re: Dinosaur Planet, parts 3 & 4
Sorry, but it sounds like you are grasping at straws to salvage a weak
hypothesis (parental care).
Everyone forgets that there is a size continuum between hatchling and adult (or
half-grown if you prefer). Yet, there is an abrupt cut off point for the
smallest size. I find it rather incredulous to assume that a 1-2 ton 1/3 grown
sauropod wont leave prints in sediments where the adult tracks are tens of
Kenneth Carpenter, Ph.D.
Curator of Lower Vertebrate Paleontology &
Dept. of Earth Sciences
Denver Museum of Natural History
2001 Colorado Blvd.
Denver, CO 80205
>>> "David Marjanovic" <email@example.com> 18/Dec/03 >>>
> As for footprints, as I pointed out in Eggs, Nests and Baby Dinosaurs, the
hatchling hadrosaur tracks from Utah do NOT occur with adult tracks.
Are you sure that the following two points are incorrect:
- The hatchlings were so light that they wouldn't have made tracks on ground
that preserves adult tracks.
- The adults were so heavy that they wouldn't have set a foot on the soft
ground that preserves hatchling tracks. (Assuming that any are known. Which
I've forgotten.) This need not mean e. g. staying out of an entire swamp; it
can also mean taking a long step over a puddle through which the hatchlings
have to run.