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Nautiloids from the Permian Fort Apache Limestone


Arizona Chris

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Hi All,

 

Another chapter done on our study of the enigmatic Fort Apache Limestone!  We found one orthocone, and  juvenile coiled conchs in our search in 250 pounds of limestones.  One larger specimen which we thought was a huge nautiloid turned out to be a big Straparollus gastropod when we finally made a clay cast of the mold in limestone.  So without delay, here is this weeks write up!

 

Lower Permian Nautiloids are found in both the Fort Apache Limestone, and overlying Kaibab formation. Far more commonly found in the Kaibab, they range in size from quarter sized to 12 inch monsters. But in the Fort Apache, we have found so far only two nautiloids in our years of searching. Fortunately, they are both different morphologically and offer an interesting cross section of cephalopod life in the Fort Apache Sea. It is notable that Winters, in his monumental GSA monograph memoir 89 found only the orthocone type and identified it tentatively as Psudorothoceras knoxense.

 

 Aperture comparison. The differences in similar mollusks can be ascertained by comparing the shapes of the openings. (Aperture) On the left, Bellerophon - a monoplacophoran has a decidedly triangular opening. Center are a gastropod called Knightites sp. which looks very much like a small Bellerophontid, but is a gastropod. And on the right, the cephalopods have a much larger and oval opening, such as the small pea sized specimen we found below.

NautiloidAperture.jpg.db90f44546494c5f3b6d9752c35f99c0.jpg

 

This little cutie was found mixed in with our first picks for gastropods out of the acid fines. This was the only one like this, and you can clearly see the septa evenly spaced along its periphery. The center is filled in with sediment thus appears as a mound here hiding the details of the inner whorls.

Nauts1-7x-StackF.thumb.jpg.1b10421ebc8fa9c5f5fcb3298ce5d687.jpg

 

 View of the aperture, a bit crushed showing the inner whorls tucking into the opening oh-so-nautiloid style!

Nauts3-7x-stackF.thumb.jpg.d4f32061251d26f541c551e4a7ea9748.jpg

 

 Orthocone nautiloid section found at site 2 as well. This is an orthoceras type cf. Psudorothoceras knoxense. The septa can be seen inside the eroded openings in the outer conch.

5a08b45a366ae_Picture572-800.jpg.177192509c43b08b7a3ef2b3b0c165ad.jpg

 

Fortunately, one end has a great view of one of the concave septa. This then would have been the side that the animal lived on in the conch. It is difficult to say how long the original conch was, perhaps 6 inches or so.

5a08b45b0bd9e_Picture573-800.jpg.c5fba0ce4fbeef0f7fc063d27c282f56.jpgWe

 

Well, thats it for this week.  We were hoping for some really big nautiloids like we find in the overlying Kaibab formation - which is the same age.  But no, that will have to wait till next year!  ;)

 

Next weeks posting will be  on the gorgeous Straparollus gastropods we found, ranging in size from pinhead to hefty 6 inchers.  

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Arizona Chris

Paleo Web Site:  http://schursastrophotography.com/fossiladventures.html

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Nice cephalopod, can't wait to see the snails!

“...whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been and are being evolved.” ~ Charles Darwin

Happy hunting,

Mason

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Thanks,

 

The snails are a huge project - thousands and thousands of specimens, all 1-2mm in size!  Ive got them down to 22 categories and am now imaging them.  Fortunately, the straparollus are larger...

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Arizona Chris

Paleo Web Site:  http://schursastrophotography.com/fossiladventures.html

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