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New Refs (Paleobiology)

The newest issue of _Paleobiology_ (25 [3]) is out,
along with two (actually three, but I've copied only
two) with articles related to dinosaurs.

  Horner, J.R.; de Ricqlès, A.; Padian, K. 1999.
Variation in dinosaur skeletochronology indicators:
implications for age assessment and physiology.
_Paleobiology_ 25 (3): 295-304.

  [Sections of ten different bones from the holotype
of *Hypacrosaurus stebingeri* (MOR 540) indicate no
generalization in LAG's, and comparisons with
*Maiasaura* related that femur and tibia LAG's compare
most closely, but cannot be used to determine rates of
growth for the animal as a whole.]

  Lupia, R.; Lidgard, S.; and Crane, P.R. 1999.
Comparing palynological abundance and diversity:
implications for bioltic replacement during the
Cretaceous angiosperm radiation. _Paleobiology_ 25
(3): 305-340.

  [In relation to Dan Bensen's recent query about the
*flora* of the Mesozoic, here's one on the Cretaceous
angiosperm rediation; haven't checked it out, will try
in a week or two, then report, if someone doesn't grab
it first.]

  O'Conner, M.P. and Dodson, P. 1999. Biophysical
constraints on the thermal ecology of dinosaurs.
_Paleobiology_ 24 (3): 341-368.

  [Basically, restates a few well known laws of
thermodynamics: babies and small dinosaurs (~10kg)
were poor thermoregulators, and would have relied on
environmental (speaking thermodynamically, this could
be weather, mama, (papa), brush, etc.) conditions;
1000kg animals would have been fairly decent, but
certainly would have required methods of cooling
beyond themselves nearer the tropics, so think rhinos,
hippos, and elephants taking mud- or dustbaths, then
relate this to comparable small ceratop[s]ians, etc.;
for big 10,000kg game, they would mostly likely have
overheated, whether endo- or ectothermic, without some
means of shedding their excess heat, and fairly often
more close to the equator you are -- apparently most
of the sauropods do seem to be nearer the equator, or
is this my imagination? -- and some biological and
ecological considerations are explored. -- read to
find more.]

Jaime "James" A. Headden

"Come the path that leads us to our fortune."

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