Thursday, November 9, 2017

tiny bones in the rocks

When I was much younger I was lucky enough to see Don Ho in Honolulu in his Waikiki stage show. His favorite song was 'tiny bubbles'
(Tiny bubbles (tiny bubbles)
In the wine (in the wine)
Make me happy (make me happy)
Make me feel fine (make me feel fine)...

When I see tiny things I often think of this song. Anyway, not all the bones I find in these 'Bernie Blocks' are large - some are very tiny. I have recently prepared 3 small bones, which may or may not belong to thalattosaurs. I've blown them up quiet large, as they are each less than one inch long. The top center one may be a worn neural arch, and the left one is definitely a limb bone or digit. The one on the right is a complete mystery - I suspect it may be an amphibian bone of some type. It is very thin, most of it is less than 1 mm thick, so it was 'difficult' to prepare, to say the least. However it's nice that it's finished. Maybe the guys in Alaska can figure out what they are. 
Sincerely, Greg Carr




Thursday, October 19, 2017

Bones, Bones - Lots of Bones

I'm doing a project that is giving me perspective on how much we have accomplished in the past 5 years. I have decided to print out a reference set of all the bones I have prepared so far. In fact, I have decided to print out 3 sets - one for myself, one for OMSI, and one for the University of Oregon's Condon collection. Right now I have scanned about 138 bones, so 3 sets will have 414 bones. In addition, most of these bones are not from the centerline of the animals. So if I print both the original bones and the mirror images, I will have about 700 bones.

I have been printing the bones for about a month out of ivory-colored PLA. It prints well, and I'm enjoying it. So far I have printed 33 sets of 3 bones, about 3 per day. At this rate it will take another 15 weeks or so for the original bones to be printed, so I won't get them all done by Christmas.

Here are the skull bones I have printed so far. This is only about half of the total number of skull or brain-case bones that we have. This really makes me thankful to have so much skull material! This is truly is a treasure.

Here are the other bones I have printed so far. Keep in mind that this is only about 1/4 of what I will eventually end up with. So many Bones!


And here is the workhorse - my printer. 


But wait - there's more! I have  lot of bones that I have not scanned. Most of them are fragmentary or are part of groups that I don't intend to totally prepare. This is because most of the groups contain bones we know well, or are very aesthetic. There are another 160 or so bones or parts of bones in the cabinet at OMSI These too will go to the University of Oregon, along with the bones sent to Alaska. 

But wait - there's still more! These bones have been taken from only about 2/3 of the find - we still have 1/3 to go! 

So ultimately I predict we will have (138+160)*3/2 = 450 unique bones !

Ribs and Gastralia


Other stuff

Backbones - centrums & neural arches


 Sincerely, Greg Carr

Wednesday, September 27, 2017

Just more backbones - as if we don't have enough of them!

Just a quick note to tell all you folks about more backbones that I've prepared. Sometimes the backbones cluster together - must be something about how the water currents & waves sorted items of similar density and shape together. Anyway, I have been working an a small rock about the size of two fists together. This rock has at least 6 backbones, maybe more. We have both centrums and centrums combined with neural arches. Some are rather unusual in the way the rib attachment knobs on the centrums look. I believe that the rib attachment point (on the centrums) migrates from the top  to the bottom of the centrum side as you go from the front of the rib cage to the back. So if you know enough you can tell where the backbone came from. However, I'll leave that to the guys in Alaska to figure out.

Here's two centrums hooked together. I was able to separate these with a bit of care. The big one on the bottom had a short, robust neural arch that was not blade-shaped in cross-section. Instead it is an oval cross-section, pretty robust.

 Here's a view of the prepared centrums I just sent to Alaska. The top group has 3  centrums as well as a nautilus, perched directly on the end of a centrum. Pretty cool! 


 Here's a centrun+neural arch that has the centrum rib attachment knobs on the side blending into the neural arch on the top. Must have come from the forward part of the rib cage. 
  And here is a rib with the neural arch that has no rib attachment knobs. Perhaps this came from the neck, where there are no ribs?
I still have 2 more backbones to finish preparing from this rock, and maybe more hidden inside it. Anyway, that's all there is for now. 
Sincerely, Greg Carr

Saturday, September 23, 2017

Bartender - yet another illium - small, please, on the rocks

Three items to report: ilium, lots of backbones, and a 3D printing project!

I have prepared yet another ilium - I think that is about 7 in total that we have found. Most all are different sizes from the different animals. The ilium is one of the three types of pelvic bones in reptiles. They are the ilium, ischium and pubis. In mammals these three bones are fused together to form the pelvis, but in reptiles they are separate bones (6 total, 3 per side). These ilia (plural of ilium) look rather like seal scapula, being a thin fan-shaped bone with a thickened knob at the base of the 'fan'.  Here is a picture of the ilium as it was being prepared, compared with a 3D replica of another one prepared a couple of years ago. The current one is much smaller.

Here it is after being prepared and labeled with the UO number.


And here is a top view, showing how thin it really is. Much of this bone is 1 mm thick or less! It makes it really challenging to prepare them, as you can imagine. However, it is finished and safely up in Alaska with about 135 other bones I have prepared.


I have a whole cluster of backbones I'm working on. So far there are 5, one is a triplet in a tight cluster that I probably won't be able to dissect, as they are too nestled together. Like all the other backbones I have ever found, they are not articulated and not sequential, and probably not even from the same animal. Pictures with the next post. 

I have just begun to do a major 3D printing project. I am going to be printing up 3 complete print sets of all the bones I have prepared. One set will be for me, one for OMSI, one for the U of Oregon. (I figure the U of Alaska can print their own as they have a 3D printer.) I have prepared, scanned and labeled about 135 bones as of this posting. Just printing out the bones directly is about 400 pieces. I figure this will take me about 4-5 months to do  them all. Additionally, about 110 of these bones are not backbones, so there is a corresponding mirror image bone on the other side of the animal. If I print out the mirror images as well I'll end up printing about 700 bones! Lots of printer time! I just print one bone at a time. I've never had a lot of luck printing multiple objects at the same time. It seems that something goes wrong with one print which screws up the other ones as well. And it really doesn't take much longer as a 3 object print takes 3 times as long - it is just the setup that takes longer. 

Here's a picture of the printer in operation. It is just about finished printing  out a limb bone that I have been told is a radius. I like the fact that I can change the color of the LED lighting to match my mood! 
Sincerely, Greg Carr




Tuesday, August 8, 2017

A Really Great Pelvic Bone

I have just finished prepping out a really great pelvic girdle bone - probably a Ischium. Reptiles have 3 bones on each side making up the pelvic girdle. In mammals these are fused into the the pelvis, but in reptiles they are the Ischium, Illium and the Pubis. It is the second largest bone I've prepared, second only to the skull. We have had another one, but that one was partially broken and considerably smaller. This one is very large, about 14cm (5.5 inches) long.

So here are the two bones (brown one is a copy) for comparison. The new bone is much larger and very robust. It still shows the typical hollow ends, indicating the bone has a cartilage end, not a bone end. The brown band across the large end is a crack in the rock, filled with calcite. I've decided to leave it as-is, though with 4-6 hours work I could take it out and glue the two pieces back together.
So here it is in all 4 side views. 




 Here's the end view of the large end - really massive!
 Here's the smaller end.

 Look at this great notch just below the flange on the large end!

Sincerely, Greg Carr


Thursday, July 6, 2017

2 More unknown bones and two well known bones

I just finished 4 more bones and sent them off to Alaska. Last post I presented a very unusual bone that I think is part of a mandible. This time I have two more unknown bones and a quadrate, the link bone between the mandible and the skull. All of these bones were found close to one another. Maybe they are associated?

The bone on the bottom left is another quadrate. We have several of these, all different sizes of course. This one is smaller than the others, and has an extremely thin web of bone between two depressions. The web ended up being held together entirely by glue since it was only about 1/10 of a mm thick!  The bone on the bottom right is a broken illium (pelvis bone) with a piece of rib stuck on the side. Nothing exciting, I've prepared a half-dozen of these. Actually, 7 years ago I would have died and gone to heaven about finding one of these!

The one in the middle is very special. I have a partial one of these from a bigger animal, but neither I nor the guys in Alaska knew what it was. It is long and skinny with a V-shaped cross section. I don't think the bone is more than 2 mm thick anywhere. Most is less than 1 mm thick - very time-consuming to prepare! (about 12 hours AFTER I got it out of the rock). I think it is a parasphenoid. This bone lies in the mid-line of the palate, between the pteregoids, and we haven't found one of these (before now, of course!). The second picture shows it in end-view - you can see how thin it is.


Here is how parasphenoids fit in a skull, looking at the bones of the roof of the mouth. They are found in everything from fish to mammals, so it makes sense they would be in thalattosaurs too. Blue bone is the parasphenoid, ptr is the pteregoid.
Here's one from a modern fish:

Last of all, at the top of the picture is a long, twisted bone. I don't know if it was twisted in life, but judging from the parasphenoid it must have been twisted before burial since it was right next to it and is much more robust. It was not twisted during burial nor afterwards in the rock - the rock has not been distorted like that. 
However, I don't know what it is! It roughly resembles a rib, but it has a triangular cross-section and  a decidedly non-rib thick end. At 7 inches long, it a significant bone - if we only knew what it was!

Anyway, I am still
Gregory Carr

Thursday, June 22, 2017

Once more, into the Unknown

Finding new types of bones is getting very rare. After all, I have excavated over 250 bones by now, and these animals don't have that many types of bones. They do have a lot of bones, but most are ribs, gastralia, centrums and neural arches (backbones to us laypeople). So finding a new type of bone is quite excited and unexpected.

I came up with one such bone a couple of weeks ago. What kind could it be? Let's list out the types of bones we haven't found yet: toes, claws, mandible.....

I think it's part of a mandible. Specifically, the back part, where the mandible pivots on the quadrate. It is definitely broken and the broken end seems to be rounded I was hoping for any break to be a suture, but apparently not this time.

So here is the bone in question. It looks pretty robust in this view. The bulge in the middle might be the pivot point for the quadrate, perhaps.


Here is the opposite side. It is moderately robust, but has a very thin end that curves over in a very interesting way. It is not real evident in this picture, but the inner surface has some very deep grooves of unknown purpose.


And here it is from the side.  You can see how the intact end curves around in a thin bowl-like structure. This would be good for hooking muscles to, I guess.


So here is a drawing of where I think it fits as a mandible. The thin curved end would be where the muscles to open the jaw would attach, and the bulge would be associated with the quadrate pivot point. The front end is broken off. 
And there is still more. There is a quadrate right next to this bone, and a couple of thin bones that are NOT ribs too. Maybe more of the jaw structure? I can certainly hope so. Time will tell.




Speaking of time, I now understand that it will take another year or more until the classification paper is published. I guess this animal is more complicated, more important, and more difficult to classify than we thought! So we must continue to be patient.
Sincerely, Greg Carr