Hey, we're here with Paul
We're gonna bust some nodules.
We are back with Scott in the...invertebrate paleontology collections here at The Field Museum.
Hi I'm Scott Lidgard
I'm a Associate Curator of Fossil invertebrates here.
So Scott, you're one of co-author on this paper that
was published in Nature about a months ago,
Right!
Saying that...
The Tully monster-- our state fossil known and loved by many...
is actually a vertebrate.
How come it took people so long to figured it out what exactly it is?
Well...
looking at it, looking at your model,
it's a really bizarre looking creature.
and...
It is..one that had perplexed scientists because it has
different kinds of characteristics that are shared by some other groups of animals,
but not by others.
and the combinations of those characteristics
has meant that scientists have gone back and forth
as to what major group of animals that might belong to.
There is something like 2000 on our collections
plus an un-processed
group of specimens just recently just got in.
So out of this 2400 specimens, there's was no consistency
through out them?
There's consistency but some of them are...
are preserved as fragments. So they're not the complete...
whole body.
And some of them are preserved in different ways
So you look at one and it might be...
looking at the back of the specimen.
Another
might be looking at a twisted specimen
or just a fragment of the front part of that the organism
Because it was
compressed after its death, this animal
and the layer of sediment around it
and were hardened into these nodules,
what you get when you open up one of these nodules
and look at the organism is a part and a counter part of a
of a flattened non hard part...
Blob.
One of the
things that we saw,
were these
segments where you can see the dark
and the light and the dark and the light and the dark and the light
alternating in...in some way.
on...
vertebrate fossils -- think of a nice piece of salmon on your
you dinner table.
uh-huh
and after you've cooked it, the salmon
flakes in this planes,
and those muscle bands,
as a body is decomposing after its death,
tend to separate one from another.
and these are separating in a very similar way
and if you looked a lot of fossils,
you can see that the separation goes all the way to the
margin of the outside fossil.
so that
gave us a clue that this might not be the kind of segmentation
that an annelid worm had.
There's also a light strip on this one,
that had been interpreted as a gut trace
that is where your digestive track would go through
or where and organism's digestive track would go through.
But what really became apparent
is that the light band along the back of the body
was different from a dark band
and that dark band went all the way out to the end of the proboscis,
and the light band went all the way down the body
to the end of the tail.
So we re-interpreted that light band
which we see most of the fossil
as the notochord,
and you can think about the notochord in a primitive fish as
being a kind of precursor to the back bone that's in us.
You didn't just look at handful of these fossils
Emily: I mean we look into... - We looked at thousand of fossils
and we were also betting and thinking
and there's more and more data came in,
It became very very clear that the vertebrate folks were..
were gonna be the winners.
[Yay!]
So when this was published in Nature,
I mean it's not very frequently that a nature paper gets...
circulated- or as much attentions as the...
[laugh]
the tully monster does.
And for it being a state fossil, it
surprises me that people all over the world were
talking about it.
So would you..why you think that it is?
-- There's kind of a mystery,
-- uh-huh
to what
past worlds looked like.
and a lot of people share that...
that...feeling
you know, what was a world like in my grandfather's day,
what was in my great great great grandfather's day,
what was it a millions years ago?
And this was three hundred million years ago.
A lot of people I believe
have a...
an imagination that allows them to venture into those past worlds
when they go to a museum look at a dinosaur
or...they see a tully monster.
I think for me the biggest thing is that...
tully monster had been living in the drawers down here
staring at me and and whispering to me,
"You don't know what I am"
[laugh]
and now I feel
very relieved and
proud to have a...
finally -- with some help-- figured out
more or less what tully monster is.
So...Paul the...
fossil invertebrate collection manager has some unopened nodules
that may contain tully monsters in them.
Let's go find Paul.
Alright Paul, so we have our nodules here
when was the last time that...
whatever organism is inside saw the light today?
About three hundreds and seven millions years ago
in Pennsylvanian period.
We're gonna shed some light on...
on whatever in here. We have no idea!
We have no idea what's in here.
Could be anything.
Alright!
Paul: try... - So...what's that...what's the technique here? it is just a...
I wont try too hard.
Try for a big surface.
Alright. Give me a Tully monster.
The nodules are pretty hardened
brttle, and shatter in all kind of pieces so...
Yeah, it seems to be breaking in every direction
except for the plane that we want it to split on.
[Banging]
woo...
is there anything in it?
and...
Both: No! [chuckles]
How frequently did you find this things in these nodules?
About half of them have something in it.
[Banging]
Might be a little bit of a fern in this one.
Oh nice!
Just a...
a small fragment.
So far we've got nothing - and a little bit of a fern.
But you mentioned there was a...another way,
a better way--
There's a better way.
So when I did with these,
is I froze them,
Several times in my freezer at home,
you let em soaked in water for a while, the water gets in,
and then when they freeze and though the ice forms, expands,
and splits them right open right along--
theoretically -- right along where the fossil is.
So you want to smash that open.
See if we found anything in here.
Yeah!
That's a whole lot a...
whole lot a just...
Yeah! most of em...aren't...
you know, beautiful spectacular fossils that you see
on display,
you get a lot of small fragments and stuff.
[Banging]
oh!
Emily: What?! - it's alright.
Emily: Oh! you've been... - So there's a nice fern,
[chuckles]
oh...
way to go!
So..what make it a nice fern?
You can see there's the
the whole fern is exposed along here,
I see...
Oh hey...
Emily: There you go. - There you go.
It's some kind of leaf.
That doesn't look terrible.
[chuckles]
That's a ringing endorsement right there.
[laugh]
nothing.
Well...
no tully monsters this time.
But a...
that's a good effort.
Yeah. But tully monster are very rare, so here...
you know lot less than one percent of the fauna is gonna be tully monsters.
Less than a tenth of a percent really.
Oh, that's make me feel better.
I'll take my leaf.
It's like winning the lottery.