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Kkoz

Need Id On 2 Strange Marine Mammal Bones.

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Kkoz

post-16540-0-78579300-1411318878_thumb.jpgpost-16540-0-16714100-1411318829_thumb.jpg Hi,

I found these 2 strange bones in a small miocene outcrop in southern california. I also found about 10 misc. shark teeth and abundant bone fragments. These bones are about 2cm long and 1.4 cm wide. What are they?

Thanks.

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Auspex

Possibly cranial; inner ear bones?

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Kkoz

That's what I was thinking. Thanks auspex.

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Auspex

Our member Boesse can probably elaborate; it is his field of study.

I have messaged him. :)

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Al Dente

The one on the right looks like part of a bird humerus.

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Auspex

The one on the right looks like part of a bird humerus.

Huh, I see what you are saying. It's well pneumatized, too...

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Boesse

They both appear to be proximal humeri of the flightless auk Mancalla. Because the muscle attachment scar extends into the pneumatic fossa and is formed as a raised ridge at least the specimen on the right in the right hand photo appears to represent Mancalla lucasi (the species formerly known as M. diegensis).

M. lucasi is widely reported from the Pliocene and Pleistocene of California, including the San Diego, Purisima, and Moonstone Beach formations:

http://www.pensoft.net/inc/journals/download.php?fileId=2076&fileTable=J_GALLEYS.

http://www.palarch.nl/2011/09/robert-w-boessenecker-2011-a-new-marine-vertebrate-assemblage-from-the-late-neogene-purisima-formation-in-central-california-part-i-fossil-sharks-bony-fish-birds-and-implications-for-the-age-o/

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Auspex

Thanks, Bobby!

Good finds, Kkoz!

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Kkoz

Thanks for the input everyone!

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jpc

a day late and a dollar short, but I see bird humerus in the right specimen, second photo.

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