Jump to content
Troodon

New Daspletosaurus from Two Medicine Formation

Recommended Posts

Troodon

The supplementary files if your interested can be accessed at the end of the article.  Lots of technical mombo jumbo :)

 

The only two nice items are the photos showing the differences between D. horneri and D. torosus

 

Screenshot_20170330-105344.thumb.jpg.16d5dc6f05be700058dab44be2fa0271.jpgScreenshot_20170330-105329.thumb.jpg.9ba97c1f162c539648b6779c3957067e.jpg

Share this post


Link to post
Share on other sites
doushantuo

I'm sorry,mumbo jumbo ?

"Fossils,SCIENCE and Paleontology"

Share this post


Link to post
Share on other sites
Troodon
10 minutes ago, doushantuo said:

I'm sorry,mumbo jumbo ?

"Fossils,SCIENCE and Paleontology"

 

That's an average collector jargon that implies it's to hard to decipher what is written :)  .  Best left to paleontologists

Share this post


Link to post
Share on other sites
doushantuo

Yeah,Troo,so collectors have jargon too?:P.

Still ,i was initially a bit rankled by your phrasing.

Thanks for the heads up.

But mind you,you could have phrased it slighly less uh..you know  it came across as slightly condescending,but I see i misjudged your intent.

You never struck me as the type to put down honest science.

My personal feeling about cladistics and most parsimony analyses is that they are slightly divorced from biological reality,and too much weight is placed upon them.

 

 

Share this post


Link to post
Share on other sites
Troodon

Love the material but a lot of it over my head and trying to understand it can be frustrating.

Share this post


Link to post
Share on other sites
David in Japan

Fun fact about the paratype MOR1130 is that it was prepped in japan.

Share this post


Link to post
Share on other sites
Troodon

I'm having an interesting discussion with Susan from PA who raised the topic of what should I call my tyrannosaurid teeth from the Two Medicine Formation.  Carr's recent announcement describing Daspletosaurus horneri helps but there are issues with just using that name to identify isolated material that looks like its from a large Tyrannosaurid.  

 

D. horneri is described just from the very end of the Two Medicine Fm NOT  the entire deposit.  The formation is made up of several units, see chart below and different dinosaurs are described from each one.  Tyrannosaurids have been found in the Upper units 4 & 5.  You can see a sampling of this in the wiki page that attached.  Scroll down half way on that page.

https://en.wikipedia.org/wiki/Two_Medicine_Formation

 

Carr's blog clearly states that D. horneri lived at the very end of the two medicine so what tyrannosaurid's were around in units 1 to 4  (82.4 to 76.1 mya) and in the remainder of the upper unit 5  (76.1 to 75.1mya).    Gorgosaurus was around, Albertosaurus maybe, Daspletosaurus torosus, Tyrannosaurid X or is the range of D horneri wider that Carr's estimate..

 

For collectors it's a big dilemma since the only way you will know if you have a D. horneri  is to clearly understand where it was found and the age of those deposits.  A very difficult task for something that was not self collected.

 

 

Screenshot_20170421-070114.thumb.png.d7c5bf4ddf8423287f888c3fe553924f.pngTwoMed.jpg.1bfc86ca1de1fdb0f9b125d0e3c6b8ab.jpg.0735225aeebfa7a757da85ba958b701b.jpg

Share this post


Link to post
Share on other sites
Susan from PA

Thanks so much for sharing, @Troodon!   Yes, an interesting discussion indeed!   These are the type of discussions kick my OCD into high gear!  :ighappy:      @-Andy- was also interested in these posts, so we'll tag him as well!  

 

I will send Dr. Carr a tweet or post on his blog, and see if I get an answer.  The problem is doing so without sounding like an evil collector of dinosaur fossils!  :ninja:

Share this post


Link to post
Share on other sites
Troodon

Here is an example of our discussion.   I have this very large foot claw from a Tyrannosaurid from the Two Med Fm.   It's size says that it's most likely a Daspletosaurus.   I know the Quarry where it was found and it's well documented because it's the same one Bambiraptor and a Gorgosaurus skull was discovered.  Lots of teeth have come out of that quarry.  It's around 76.5 mya, older than D. horneri, so what is it ?  Tyrannosaurid indet.  :ighappy:

Share this post


Link to post
Share on other sites
Susan from PA
2 hours ago, Troodon said:

Here is an example of our discussion.   I have this very large foot claw from a Tyrannosaurid from the Two Med Fm.   It's size says that it's most likely a Daspletosaurus.   I know the Quarry where it was found and it's well documented because it's the same one Bambiraptor and a Gorgosaurus skull was discovered.  Lots of teeth have come out of that quarry.  It's around 76.5 mya, older than D. horneri, so what is it ?  Tyrannosaurid indet.  :ighappy:

In my mind, Tyrannosaurid indet. is the only ID we can give the large claw at this point, since Thomas Carr had stated that D. horneri is at the upper or younger part of the formation.  

 

I do agree that the size says "Daspletosaurus" and not Gorgosaurus.   Also, the age of the part of the Two Medicine in which it was found, falls within the boundaries of the age of Daspletosaurus torosus.   Things that make me go hmmmmm.......:headscratch:

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Recently Browsing   0 members

    No registered users viewing this page.

×