Ghost Ranch is kind of the idealistic Old
Western set. There are these beautiful red
cliffs that are surrounding the ranch itself.
But down in the basin, just below Ghost Ranch,
you get red, and purple, and green, and white
Badlands. And those are the places that are
really good to find fossils. It’s definitely
the best place to find early carnivorous dinosaurs
in the world.
I’m Sterling Nesbitt. I am a research associate
of the American Museum.
So, starting in 1881, there’ve been a number
of paleontologists that have searched these
beds
It really wasn’t until the 1940s, right
after World War II that one of my predecessors,
Ned Colbert, began excavating at Ghost Ranch.
When Ned Colbert, his assistant George Whitaker
first discovered the quarry they thought it
was probably just one or two little dinosaurs
sticking out of the side of the cliff. But
it is one of the world’s great deposits
of dinosaurs of any kind.
My name’s Mark Norell and I’m the Macauley
Curator of Paleontology at the American Museum
of Natural History.
It’s really unusual to find mass assemblages
of dinosaurs. Occasionally we find things
called bone beds, where we find lots of different
species and we find single individual bones,
but the thing that makes Ghost Ranch so special
is so many of the entire skeletons are there
– just piled on top of one another.
Most of what Colbert saw were these delicate
bones of a carnivorous dinosaur named Coelophysis
bauri.
When dinosaurs first appear, they weren’t
the big animals on the block yet. They didn’t
dominate ecosystems anywhere in the world.
They were all pretty small. And when people
think of dinosaurs, they usually think of
T. rex or giant sauropods like Apatosaurus,
but this is what probably all early dinosaurs
looked like. And then later they grew into
the gigantic monsters in movies and in dinosaur
halls.
Ghost Ranch preserves our most detailed picture
of late Triassic, that is about 200 million
years ago, ecosystems in North America. Having
all the Coelophysis specimens together in
one bone bed like this, it’s the closest
we as paleontologists can ever come to really,
truly finding an equivalent of a living population.
I’m Danny Barta. I’m a PhD student in
the Richard Gilder Graduate School at the
American Museum of Natural History
I’m interested in the growth and development
of dinosaurs, particularly Coelophysis because
Coelophysis sort of set the standard for this
body plan that we saw later carried to extremes
in Tyrannosaurus and then Velociraptor. And
this is the group that gave rise to birds.
We have an okay handle on the anatomy, but
we don’t know lots of details. So, even
though thousands of skeletons may have been
preserved, only a few dozen really are prepared
and out of those, only a few are really prepared
well.
These bones are really delicate, and once
you expose some of these bones in the field,
or you have uncontrolled conditions, they
just break. And you can’t get the pieces
back together.
So, instead of taking each bone out individually,
Colbert took out these big blocks of rock
and bone and everything else, wrapped them
in plaster, and brought them here.
One of the things I think people don’t understand
about collecting fossils is we go out on an
expedition, it’s hard work, but what really
takes the time is the preparation that we
have to do to be able to expose these things.
So, when you look around a room like this,
you look around the rooms that we have with
the unopened blocks – these are really just
libraries of objects. And it’s like if someone
goes to the Vatican archives and they find,
you know, something that was either penned
by Leonardo or a Mozart manuscript.
That’s what we have here, and while it might
take a while for it to be discovered at least
it’s safe here and it’s amenable to using
new technology on, and it allows a whole future
generation of scientists to be able to look
at these things almost in their original contexts
So, with the specimens here, I will be making
very thin sections of the long bones of Coelophysis,
usually about 50 or 30 microns. We have to
be able to pass light through them. When we
look at them under a microscope, we often
see growth rings, analogous to tree rings.
And so, we can count, you know, essentially
one growth ring for every year. And this gives
us an idea of how old all of the individuals
in a population were when they died.
Coelophysis is really in some ways kind of
a model dinosaur for understanding dinosaur
growth. By studying, you know, what Coelophysis
growth rate and metabolism may have been like,
this will give us more detailed insight into
how some of the evolutionary innovations we
typically think of as occurring in birds—you
know, high metabolism, warm-bloodedness—when
exactly all of those things evolved.
These historic collections that were collected
almost 70 years ago have so much to teach
us. By applying, you know, techniques that
have really only been developed in the last
30 years or so, like CT scanning and bone
histology, we’re able to gather a lot more
data than we would have ever thought possible
back when Coelophysis was first discovered.
One of the real interesting things about Ghost
Ranch is that it’s come back into a real
place of prominence in paleontology right
now.
This is our tenth field season out there.
And we’re working in the formation just
below where the Coelophysis quarry was found.
So, it’s a bit older. We don’t know how
much older— maybe five to seven million
years older— but what we have are relatives
of dinosaurs. And we have some earlier carnivorous
dinosaurs that are unlike anything else found
anywhere else in the world.
It’s not just the place where dinosaurs
were found 75 years ago. It’s the place
where dinosaurs are found today.
