Fossil Living Chamber

Architeuthoceras

Architeuthis
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#1
This is the best I could do last weekend. Just the mud infill of the body chamber of a large endocerid, would have been about 4 to 5 feet long I guesstimate. A small peice of the endocones is visible in the first photo (upper right corner), with some mud filling the siphuncle at the end of the body chamber producing the nob. And an end view showing the shape of the shell and location of the siphuncle.
 

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Architeuthoceras

Architeuthis
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Moderator
#9
Here are two casts of body chamber and siphuncle found in shale over the weekend. They are both showing the bottom side, hence the small trilobite mold in the upper pic is a mold of the top of the trilobites shell. There is also a graptolite laying along side the siphuncle in the top pic. Also in the top pic you can see a ghost of the phragmocone and chambers that dissolved probably before the surrounding shale turned to stone.
 

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Architeuthoceras

Architeuthis
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#10
Here is an internal mold of the body chamber and siphuncle inside an external mold of the shell. All trace of the shell material has dissolved leaving the internal mold and a hollow where the gas filled chambers and the shell material used to be. The shell in this example probably dissolved after the surrounding mud had turned to stone, so the hollow was preserved.
 

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Architeuthoceras

Architeuthis
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Moderator
#14
They all were found in the informal Calathium Calcisiltite Member of the Fillmore Formation, in the Ibex region of western Utah. Of course it is a secret spot and if I told you exactly where it was I would have to make a call and have something done about it :wink:

By the way, they were not collected, just photographed in the field and marked with a GPS.
 

Phil

Colossal Squid
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#15
Congratulations Kevin, stunning finds. Might be a little far for me to go and have a look in your 'secret location' though! Any idea as to the species?
 

Architeuthoceras

Architeuthis
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#16
Phil;92998 said:
Any idea as to the species?
The first two I would just have to say Protocyclocerid, could be either Protocycloceras or Catoraphiceras but I cant see the sutures, Catoraphiceras would have a ventral saddle.
The big one is probably some form of Ellesmerocerid.
 

Architeuthoceras

Architeuthis
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Moderator
#17
An ammonoid body chamber found last weekend. An Arctocerid probably churkites. Like the others, the body chamber filled with mud that partially lithified, protecting it from the crushing weight of the sediment. Unlike most of the others, the phragmocone left an impression in the soft muddy bottom which also partially lithified, or at least got hard enough to protect it.

Also a photo of Jim Jenks, a fellow triassic ammonoid enthusiast.

and yours truly:old:
 

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