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DPS Ammonite

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I found this 4.75 inch long silicified sponge? branch after dissolving a large piece of the Permian (Leonardian) Fort Apache Limestone from the Schnebly Hill Formation east of Payson, Arizona in four gallons of pool acid. Only about five percent of the fossil was exposed. 

 

The outer part is denser than the sometimes nearly hollow interior. One cross section shows two tubular structures with denser edges. No organized patterns suggesting a bryozoa or coral branch are present.

 

Do you think that this is a piece of a branching sponge?

 

Top photo: cross section is 1 inch.

@Arizona Chris

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Branch is 4.75 inches long.

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Bottom photo: cross section is 0.5 inch across.

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I will defer to the real experts but I will say that my money is on sponge. It looks right to me - I've got extant sponges that look a lot like that (overall shape).

Nice job dissolving it out of the rock, btw.

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Very nice indeed.:)

Yes, I also say sponge. 

Good job.

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Pretty definitely a sponge, you've got a lovely range of spicules there! (enlarged and tweaked):

 

5ce92eb86837a_Screenshot2019-05-25at09_52_30.jpeg.4d3d44f4f47f12e947b380cd0b6bc015.jpeg5ce92eb906c66_Screenshot2019-05-25at09_52_54.jpeg.871f315976e126fb6ddbf94e878ca5f8.jpeg5ce92eb9c4647_Screenshot2019-05-25at09_53_18.jpeg.8ad3796c7aa1a38df94c03d741e17396.jpeg

 

 

Tarquin

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Nice sponge, could you take a picture of it with a scale? I'm just curious how big a fossil it is.

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I agree with a nice sponge.

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