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Jon From Texas

Found in a river

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Jon From Texas

I found this in the sulphur river in North East Texas.  It is covered in a thin, light grey layer layer of rock and the center is a glassy looking grey/tan material with vain like patterns and a scaley texture.  It has a smooth bottom that looks like it might have been attached to a smooth surface.  It was in the wall of the river about ten feet below ground level.  It broke when I hit it with a metal tool while I was digging.  

 

Any help with identifying this would be great.  I've had it for years and have not seen anything that looks quite like it.

IMG_20180913_223213~2.jpg

IMG_20180913_223124~2.jpg

IMG_20180913_223037~2.jpg

Edited by Jon From Texas

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FranzBernhard

I would say the same - a piece of a radiolitid rudist. The second photo is especially nice: It seems that there has grown a tube worm on the inner side of the rudist.

Franz Bernhard

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JarrodB

Rudist

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Tidgy's Dad

Yup, nice find! :)

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abyssunder

I agree, it looks a rudist fragment to me also. :)

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erose

As johnj suggests, look up Durania. It is a fairly distinctive large rudist of the Upper Cretaceous. 

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KimTexan

I agree with it being Durania austinensis rudist. The large shell fragments I have a very hard. These are the 2 shell fragments I have.

13C25AE3-0A10-43D5-8F12-699768F1D6D8.thumb.jpeg.8c3f2c9a13693e33ff34ad2b5820406b.jpeg

4392DB81-14B6-4362-ACCC-E17278F587B1.thumb.jpeg.cd2c64215ba01901f95fbe0e7c814f16.jpeg

However I suspect some mollusks I have found, which are coated with the gray clay/shale stuff are remnants of the infill of the rudists’s cavity or chamber of the shell. The infills are covered with beautiful nacre, I assume from the inside of the chamber that eroded away. That’s the only thing I can think the tubes would be.

These are pics of the concretions with the what I think are infills of rudists cavities.

D9319D8D-AC69-4D5D-9689-10F8140D8F16.thumb.jpeg.8a3ccacedb057a87b053afd3bc6beaf7.jpeg

 

The next to last pic is in the concretion with the tubes. It looks an aweful lot like my rudist shell interior.

The reason I post these with color is so that you may see what could potentially be underneath the gray layer.

71E15C36-D7B9-4349-A2C6-EC3C43186BC4.thumb.jpeg.14dac5f54cf0746e876cbe40954ff03a.jpeg

 

C66DC103-CDC1-42AD-990C-5888EE4F3B3B.thumb.jpeg.88080c25fade690c63c2566d2ce68303.jpeg6D6B5377-85E5-41D0-BF3B-B499B94E1132.thumb.jpeg.1c099d4165e98c5091315ab0c2b1b977.jpeg8D584423-05F1-4C6A-981A-B1C2275C477A.thumb.jpeg.b298e06a902bc48529372f4f70c6a4c4.jpeg

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