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World's Oldest Bird
(Continued from Page BIO)
navigated from the ground to the
tallest branches to escape
predators.
Protoavis also would unply that
birds were much more diverse in
the remote past than previous
evidence has suggested. Not until
the late Cretaceous period, 70
million to 135 million years ago, did
birds begin to flourish worldwide.
Many of them were water birds
with skeletons similar to those of
modem birds.
The gap between such species
and Archaeopteryx has always
seemed illogical to scientists. The
Cretaceous burst of bird life, in
cluding some species remarkably
close to modem families, indicated
the presence of earlier birds such
as Protoavis.
But bird bones, particularly
those of small species, are hard to
find. Hollow and fragile, they are
likely to be crushed, deformed, or
eroded. Predators and scavengers
may feast on dead birds, leaving
the bone fragments scattered and
broken. The best preservation
occurs when mud covers the
carcass soon after death.
Flash-Flood Fatalities
That’s what happened to
Protoavis in the quarry carved out
of the Dockum Formation, a bone
rich bed of ancient mudstone.
Chatterjee thinks the two birds
were drowned in a flash flood and
their bones preserved by mud and
debris.
There is little water around the
Dockum today. Chatterjee and his
team work in a bleak landscape of
red mudstone mesas, surrounded
by mesquite and dwarf junipei.
Since the oil bust, there’s been
little human activity in the area.
“Even the rattlesnake that used to
pop out of its nearby den to take the
sun has disappeared,” says
Chatterjee, whose research is
supported by the National
Geographic Society.
The heat’s still there, however.
Temperatures sometimes soar to
110 degrees, forcing the scientists
to erect impromptu cloth shelters
to shield them from the sun.
It hasn’t always been so hot and
barren. Stretching from New
Mexico to western Texas, the
Dockum Formation 225 million
years ago was lush in tropical
vegetation and full of ponds, lakes,
and large rivers. Chatterjee thinks
the flood that devastated the birds
and other strange creatures he has
found at the site was triggered by a
tributary of a river the size of the
Mississippi.
'Ag In The Classroom
Events Slated Next Wi
LANCASTER - Ag In The
Classroom activities will be
conducted in three Lancaster
County school districts this coming
week, according to the program’s
educational coordinator, Jane
Eshelman.
Activities will be held in all
fourth-grade classrooms in the
Conestoga Valley, Manheim
Township and Warwick School
Districts from Monday through
Wednesday.
Sponsored by the U.S. Depart
ment of Agriculture, Ag in the
Classroom, is designed to in
troduce the non-farm sector to
modern agriculture. “It makes the
students aware of the part that ag
plays in their daily lives," says
Eshelman.
Eshelman said that Wednesday
activities normally center around
the dairy industry because of
dairy’s dominance in the county.
The Manheim Township program
will include a field trip to Oregon
Dairy on Wednesday, she said.
The Penn Manor district will
observe Ag in the Classroom in
their third grade classrooms on
Nov. 17 to 19