Jump to content

Monica

Recommended Posts

Hello everyone!

 

On Monday, I found a beautiful Treptoceras crebriseptum orthoconic nautiloid in a huge rock at Mimico Creek in the Etobicoke/Toronto area (Georgian Bay Formation, Upper Ordovician).  It has been suggested that I might have a complete specimen, so I was hoping that someone out there might be able to let me know if this is the case or not.

 

Here are some pictures...

 

Whole specimen:

DSC00434.thumb.JPG.2a5860596d6a2d72c1582e2af3068fbe.JPG

 

Close-up of the base of the specimen (specimen has been turned over) - note that it is smoothly rounded and shows no septa - is this the fossilized living chamber of the animal?

DSC00438.JPG.c602d87f87e965e19437ebcf28979957.JPG

 

Close up of the tip of the specimen - note that it seems to end before the rock edge - is this the very tip of the animal?

DSC00439.thumb.JPG.fe0dc9b519934dcfbda773a2578b2653.JPG

 

Close up of the piece that shattered off the tip of the specimen - note that it also seems to end before the rock edge:

DSC00440.thumb.JPG.be7d984134a42f7e9e6f393e63643cb7.JPG

 

Thanks for your help!!!

 

Monica

 

 

 

 

 

  • I found this Informative 2
Link to comment
Share on other sites

Cropped, rotated, brightened, and enlarged.

 

 

DSC00434.thumb.JPG.2a5860596d6a2d72c1582e2af3068fbe.jpg

  • I found this Informative 1

    Tim    VETERAN SHALE SPLITTER

   MOTM.png.61350469b02f439fd4d5d77c2c69da85.png      PaleoPartner.png.30c01982e09b0cc0b7d9d6a7a21f56c6.png.a600039856933851eeea617ca3f2d15f.png     Postmaster1.jpg.900efa599049929531fa81981f028e24.jpg    VFOTM.png.f1b09c78bf88298b009b0da14ef44cf0.png  VFOTM APRIL - 2015  

__________________________________________________
"In every walk with nature one receives far more than he seeks."
John Muir ~ ~ ~ ~   ><))))( *>  About Me      

Link to comment
Share on other sites

I would say it is essentially complete.  However, it seems to be missing the tip.  This might have happened while the animal was still alive, but at any rate it is fragile and so the tip of the shell is often missing.

 

Don

  • I found this Informative 1
Link to comment
Share on other sites

23 minutes ago, FossilDAWG said:

I would say it is essentially complete.  However, it seems to be missing the tip.  This might have happened while the animal was still alive, but at any rate it is fragile and so the tip of the shell is often missing.

 

Don

 

Thanks, Don!

Link to comment
Share on other sites

Great specimen! I agree with Don about the tip - it may just be fragility but a lot of nautiloids were deciduous, shedding their earlier stages as a matter of course.

  • I found this Informative 3

Tarquin

Link to comment
Share on other sites

18 minutes ago, TqB said:

Great specimen! I agree with Don about the tip - it may just be fragility but a lot of nautiloids were deciduous, shedding their earlier stages as a matter of course.

 

Thanks for the added information, Tarquin!

Link to comment
Share on other sites

12 hours ago, howard_l said:

I think there would be more of the living chamber there but most of it looks there.

 

 

Thanks for chiming in!  I've passed this specimen on to a friend who can prepare it properly - I'll post pictures of it when it's done :)

  • I found this Informative 1
Link to comment
Share on other sites

Is this orthoconic nautiloid complete?

Needs a rear deck and a swimming pool. :heartylaugh:

  • I found this Informative 1

 

 

Mark.

 

Fossil hunting is easy -- they don't run away when you shoot at them!

Link to comment
Share on other sites

I recall reading from the book Stratigraphy and Paleontology of Toronto and Vicinity that the body chamber of Treptoceras crebiseptum occupies at least 25% of the animal. 

  • I found this Informative 1
Link to comment
Share on other sites

1 hour ago, JUAN EMMANUEL said:

I recall reading from the book Stratigraphy and Paleontology of Toronto and Vicinity that the body chamber of Treptoceras crebiseptum occupies at least 25% of the animal. 

 

Thanks for the interesting fact - we'll see what it measures when it's cleaned up...

 

Link to comment
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
×
×
  • Create New...