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Douvilleiceras

Inside the heteromorph ammonite Scaphites

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Douvilleiceras

Hello All,

 

Recently, I've acquired a sliced half of the Cretaceous heteromorph ammonite Scaphites. While rarely sliced, I managed to find one buried in a pile of similarly sliced Madagascar ammonites, and purchased it. Here are the photos:

 

1. A view of the whole ammonite. Here, we can see the phragmocone as well as the sediment-filled living chamber.

20170924_110812.jpg

 

2. A closeup of the phragmocone, showing the beautiful septa. The minerals are very pure in this example, making some chambers appear as if they are filled with a tinted glass.

20170924_110740.jpg

 

3. The point of no return: the outer whorl splits off from its counterpart, creating the unique shape which Scaphites and its relatives are known for.

20170924_111429.jpg

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ynot

Interesting! Thanks for sharing.

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caterpillar

May we see the other side please?

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Douvilleiceras
13 hours ago, caterpillar said:

May we see the other side please?

Sure! Here's the other side! It appears that it did not get much preparation, but the fine details are still exposed.

 

20170925_213034.jpg

20170925_213120.jpg

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caterpillar

Nice. Thanks

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old bones

Beautiful! Thanks for the 'inside story'. :)

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ynot

It is a nice ammonite, but I do not see a heteromorph here.

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jpc

Scaphitids are the least heteropmorphic of the heteromrphs.  In the first photo, see that little 'bubble' ion the inside wall of the phragmocone?  The phragmocone curls away from the rest of the ammonite for a wee bit, then comes back into contact with it in this case.  Pretty subtle.  

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JohnBrewer

Nice example :)

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Uncle Siphuncle

What JP said.  Heteromorphic form is a highly variable, wide spectrum description of form.  There are several different form factors or modes of deviation from plain vanilla planispiral ammonites, and different degrees of variation within each of these forms, some ranging from subtle to radical.

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