Thursday, July 31, 2014

Platecarpus restoration complete! All hail Cap'n Chuck!

After 8 long years of work, our Platecarpus tympaniticus specimen RMDRC 06-009 "Cap'n Chuck" is finally finished! These last few weeks of the project had been dedicated to finishing the details of the armature as well as packing it for its trip to its new museum forever home. It seems like just yesterday when I was lifted in a freezing drizzle in a Bobcat excavator bucket one October day to investigate a lonely vertebra poking out of the side of a gully wall. Poking around revealed what looked like the rear of a skull, and we decided to come back the following spring to finish the job.
Working on turning a vertical surface into a flat surface

By the time we completed the excavation, we could walk down the debris pile to the gully bottom. We took out multiple jackets since the bone density was so high, working on them in the lab was much safer for the specimen.

Main body and skull block in the Show Prep stage
Once "show prepped" (preparing the jackets to show what is inside of them) we disassembled them and placed the bones in drawers in the Clean Room for safe keeping. There it stayed for years until a customer was found.

Coming together. The white bleached bone 4th from the left is the first bone found
Earlier this year we started restoring the bones for mounting. While we had the bones handy, Cap'n Chuck was molded so copies can be sent to other museums in the future. The mosasaur was incredibly undistorted, the ribs were even round in cross section, unlike the typical Kansas condition of being squished pancake flat.

Dillon (left) vs. Cap'n Chuck (right)


Snakey!
The final result is pretty spectacular. The undistorted ribs helped us get a very accurately shaped torso, with cartilage and even an interclavicle. The skull is beefy and bulldog-like, much different than the lower chalk specimens of Plesioplatecarpus planifrons.
Showing off the pterygoid teeth

Paddle and chest detail
Vertebrae are much larger and more robust than the lower chalk specimens. Surprisingly, the finished mosasaur was a bit shorter in length than we had anticipated, coming in at just over 17 feet (5m) long.



Skull detail



Sunday, June 22, 2014

Beefy Platecarpus Restoration Update!

For the past few weeks, TPI field crews have been scouring the outcrops of Western Kansas and finding some spectacular specimens. More on those in a future blog update.

Since the field crew was gone, the lab crew is much less distracted and has made great progress in assembling the Cap'n Chuck specimen of Platecarpus tympaniticus. Skull reconstruction is now complete and painting of the small restored areas is all that;s left. total length ended up being 52cm, but the width gives it more of a bulldog appearance than the lower chalk Plesioplatecarpus planifrons. I'm still trying to get used to all these new names since the reclassification of plioplatecarpines a few years back.

Top view
The only bones I was completely missing were both squamosals, but they were pretty simple to fabricate.
If you look carefully, we even included the mounted epipterygoids
The skeleton has had individual clips fabricated to hold each bone securely in place. Those subassemblies are now being fastened to the armature. The specimen is intended to be hung at its future museum home, however building it on cables in the lab is too unsteady. The posts supporting the superstructure will later be removed before shipment. The light colored vertebra fourth from the left is the first part of the mosasaur I discovered coming out of the outcrop.
Ribs beginning to be fit, though all still need adjustment

Individual bones are assembled into segments so that it can be quickly and precisely set up in a new facility. All limbs are removable, as are the ribs and skull. The vertebral column breaks down into segments. With any luck though, the steel armature will be nearly invisible on the final mount.

Front paddles nearly assembled.

Thursday, May 1, 2014

Cap'n Chuck Rises: A Teaser

Like many places, progress on various projects here ebbs and flows. Sadly, the Pete III Daspletosaurus restoration project has been temporarily put on hold so we can address more pressing matters. In this case, it's Cap'n Chuck (RMDRC 06-009), a fairly complete and extremely well preserved Platecarpus tympaniticus specimen that I discovered one cold October day in 2006. A recap of the early part of the project can be found by clicking here. Once prepared the specimen sat in drawers in my office for years.
Squalicorax bites on the top of the skull

That's a nice set of ribs
Recently the powers that be have decided that we should restore and mold the skeleton to replace the smaller Platecarpus planifrons skeleton in our cast catalog. Comparing it to the lower chalk mosasaur, Cap'n Chuck has a nearly identical skull length, more gracile lower jaws and wider top of the skull, however its postcranial skeleton is radically different in proportions. Humerei and vertebrae are nearly twice as big. The ribs are surprisingly uncrushed, preserving their original round cross section as well as curvature. In fact they are so well preserved we can even with some degree of certainty determine which ones belong on the left or right side (nearly imossible to do on typically crushed ribs).

Lower jaws, slender and displaying symmetrical tooth replacement
Nearly complete axis showing beefiness


The differences really are amazing. A few years back, Takuya Konishi split Platecarpus planifrons into its own genus: Plesioplatecarpus. I was very skeptical of this split for a long while, but now after comparing the low chalk mosasaur against its upper chalk relative, I'm really beginning to see his point.

Wednesday, April 9, 2014

Scanning a Daspletosaurus

So we all know that fossil skeletons are rarely found 100% intact. This is especially true for larger animals for a number of reasons, from scavenging to paleoerosion to roots to modern weathering. Even with the mighty tyrannosaurs this is true: Sue? Missing bits. Ivan? even less complete. Sir William? The dozens of shed tyrannosaur teeth at the site might be a hint where lots of the parts went. Yum.
Field map of quarry

Quarry during dig



During excavation of Pete III, the TPI field crews kept careful records to document the site properly (as all paleontologists should, I don't care if you're academic or commercial). As we excavated and uncovered bones, they were assigned field inventory numbers, recorded and were mapped to scale. It quickly became apparent that there were only enough leg elements for one. The other one was gone, but where did it end up?

Ankle bone mirrored in the computer
Microstratigraphy along with the mapping provided a possible answer. The sediment indicated that Pete III was located in a crevasse splay deposit. These deposits are formed when a natural levee breaks, squirting water and sediment over the adjacent floodplain. It's like a geological zit. This particular rupture apparently contained a Daspletosaurus in early stages of decomposition, where the bones were still articulated and loosely held together, though some were washed further on. Unfortunately, we think that's where the right leg ended up. We were 75 million years too late.
Original and printed bones, various colors of PLA
OK, so I had to sculpt one bone by hand


So what can we do? A one legged Daspletosaurus mount looks stupid. In the old days we would sit down with some material, a ruler and our eyeballs and sculpt the mirror image by hand. Luckily we don't live in the stone age anymore and instead we have computers and lasers and hot plastic.

Project layout. Pete's skull will be about 1.8x the size of the cast on the table.
We were missing one phalanx completely, so we laser scanned one from our Albertosaurus cast, blew it up to size, and then printed it. The entire right foot was scanned from the left, mirror imaged in the computer and then printed in full scale. We're still in the process of scanning the femur, tibia and fibula, but instead of printing them (which would take a lot of time) we are sending the files to someone with a 5 axis CNC router to carve them for us. Work smarter, not harder!

Thursday, March 6, 2014

Megalocoelacanthus revisited: New skull restoration

I know we've been over giant coelacanths from Kansas before on this blog, but they're so strange and rare that we can't get enough of them. Combine that with the fact that besides Hugo Dutel et al's paper on this specimen and this blog page, there is a dearth of information out there on the web about this critter. Consider it public education.

Megalocoelacanthus in all its glory
Megalocoelacanthus is known from just 2 specimens in Kansas: the holotype specimen that we prepared at the RMDRC that now resides at the American Museum of Natural History, and a second far less complete specimen that I discovered back in 2007, which Mike Everhart are hopefully publishing on in the near future (no pressure, Mike). The holotype was molded and cast several years ago, and we also molded the principal coronoid off of the second one to fill in a missing part for a more complete skull. Our first attempt was done without taking out any of the flattening distortion that is common in the Niobrara Chalk, and the results can be seen here. Over the past several weeks, Bryan Smalls has been attempting a second restoration attempt with guidance, assistance and not-always-helpful commentary from yours truly. The results were much improved.
total skull length is approximately 65 cm

Huge gular plates 
One thing we learned in this project was that people really need to illustrate certain parts of coelacanth anatomy better. Specifically the inside of the mouth and how the cliethra attach/fit. Also how catazygals go along the notochord. Get on it, smart people!

Almost dorsal view showing neurocranium ornamentation

Thursday, February 20, 2014

And now for something slightly different

You all deserve a brief respite from the dead fish and Avaceratops update barrage. What better excuse to talk about our big Daspletosaurus Pete III then? It's about the only dinosaur we have that people tend to ask about anyway. We've had an opportunity to catch up on a few projects lately and are able to spend some time in preparing the final few bones from their field jackets, while also restoring the skull bones to get them ready for 3d laser scanning and printing.

Bryan finishing the neural arch of caudal 2
I'm sure you have heard about the special challenges that preparing Pete III poses. I even did a paper on it, which is posted on my academia.edu page. When done, the bone itself is pretty stable, but it just looks somewhat ugly since it's made up of thousands of small fragments. We've adopted a technique using tinted hydrocal to fill in these small surface gaps to help give the bones a little more strength as well as make them look less pixellated (to borrow a term from a friend).
Left jugal after initial prep
Left jugal beginning restoration
Left jugal after finishing
Pixellated right quadratojugal

Much better with plaster
And in further comparison to the size of Pete III vs. Tyrannosaurus rex, here's a teaser comparing the left ectopterygoids of our Daspletosaurus vs a mounted copy of a rex. Not a whole lot of difference there overall.
Can't wait to get finished with this head...

Tuesday, January 28, 2014

Avaceratops skull finished - Tucson out the door

So, we here in the lab have survived yet another pre-Tucson Gem and Mineral Show crunch. Barely. This year we are exhibiting our casts at the 22nd Street Show. Come by and see our new stuff, like the Megalonyx, Enchodus, Stangerochampsa and our new Avaceratops.

Pinchy!
Never thought that pile of bones would turn out like this
Speaking of that, the prototype is finished! We molded the masters and then cast them using a rotational casting machine. Very lightweight! The finished skull is 1.05m (3'5") long from rostrum to end of parietal.

First run of the 3d model made from photographs
Very cute, and since the brow horns are pretty darn near symmetrical, their tweezer-like form is probably real. Very different than Nasutoceratops or even the MOR specimen of Avaceratops that Penkalski and Dodson described. What that means precisely is something for the experts to work out.

Human for sacle
The Enchodus is also pretty darn cool looking. Coming in at just 5 feet long (1.7m), it's one of the scariest looking little fish I've ever dug up.


Enchodus prototype

Stop by the booth and check out the specimens. And if you would like a copy of the Avaceratops, tell Mike I sent you. He;ll give you a good deal.