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gturner333

Pennsylvanian oddity

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gturner333

I recently found this odd item and am trying to determine if it is a fossil, maybe a bivalve, or just geological. I found it at the Pennsylvanian site in Jacksboro, TX at Lost Creek Reservoir. 

 

The scale hash marks are 1mm.

 

Thanks for any help.

unkown 7 bot.jpg

unkown 7 closeup.jpg

unkown 7 top.jpg

unkown 7 side 2.jpg

unkown 7 side 1.jpg

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ynot

I would guess sponge  if I knew anything about sponges.

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JimB88

maybe a seed of some sort?

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DPS Ammonite

I concur with JimB88: seed. Fossilized seeds occur in the dark Finis Shales. Could also be more modern seed such as variety of Hackberry. First photo looks most like a Hackberry seed. Show to V. Friedman, DPS member. She has lots of fossil seeds from the area.

 

What is the makeup of the piece: limestone/calcite or modern woody?

 

 

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gturner333

I do know the person in the DPS and will ask her. This is definitely not modern. It sinks like s rock (fossil) in water. It does look like some of the pictures i've deen of trigonocarpum and Cardiocarpon. 

Makeup of item is more limestone. 

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gturner333

Thanks for the link, Innocentx. I'm starting to lean toward Trigonocarpum, but need to research some more. This is great - my first seed. 

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Herb

Here is a Trigonocarpis sp, from that same site I collected a few years age,It does look similar. sorry about the picture.

P, Trigonocarpus seed.jpg

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jdp

My first impression is chondrichthyan.

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fossilized6s

 

This may help. Scroll down to @fiddlehead 's ID. 

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Wrangellian

My first impression was a fusulinid but I might be way off base... are these not found at that site?

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gturner333

I have collected many fusulinids at Jacksboro and they often have the wavy lines like this fossil. But they are never this large or wide. The cross sections also are quite different with fusulinids having circular patterns of their chambers. Although, sometimes those chamber pattern are eroded away. They also tend to taper off at both ends. Thanks for your help. 

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