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minnbuckeye

Devonian Unknowns, probably nothin

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minnbuckeye

Here are some Devonian finds from Iowa that are likely Nothing but geologic. Before they go on my junk pile, I want to see if I possibly could be wrong: 

 

1: I have hunted in this quarry many times and have never seen these little  "lines". They were frequently  present in a certain pile of broken rock. First and third picture shows rocks about 6 " in diameter. Any ideas?

 

DSC_0944.thumb.JPG.cbadd9487d5805adb2a556ee57a9bccb.JPGDSC_0943.thumb.JPG.d265dc529e672011309d4440cfb91035.JPGDSC_0941.thumb.JPG.4677402ebcc7cad9d12756abebeee353.JPG 

 

 

2: These circular specimens have a distant appearance of a crinoid stem cross section. Again, having been to this quarry many times, this structure is new to me. Usually crinoids are well preserved. The face of the rock had 20? of these imbedded in it. As you can see, it goes through the sample and is visible on the back side.

 

2017-05-18.thumb.jpg.d558c7e4b0b145a497802daf1511820a.jpg 

 

 

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minnbuckeye

Finally, this also intrigued me so I brought it home to post:

 

DSC_0933.thumb.JPG.73503355881b9c1a59257f6defe254ec.JPG

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minnbuckeye

Again, very benign finds but my curiosity was raised on discovering these. 

 

Mike

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WhodamanHD

To my untrained eye, the lines do appear to be fossils. They may be plants. I would say graptolite but the lines are too straight and don't have any bumps. I have come across annelid worm burrows here in Maryland on Devonian rocks, And that would be my bet for the first one. Here's some examples:

IMG_1461.JPG

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WhodamanHD

Here is another

IMG_1462.JPG

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Fossildude19

The first item looks like the pyritized burrows that I have found in the Middle Devonian of New York. 

The second item I have no idea. Any chance of breaking it along the edge of the circle, to see what it looks like inside??

My first thought was a burrow cast on that.   

Can we get better pictures of the last item?

To me, it looks like a modern lichen pattern?   :headscratch:

 

 

DSC_0933.JPG.b292870c31597f4f0cc7f4bd69006aca.JPG

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Rockwood

The fragmented appearance in places gives the first one the look of plant material to me. Something like Psilophyton  perhaps.

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Fossildude19

 

The items in the first picture look like they are pyritized. Is the the case?

 

DSC_0943.JPG.bb66af6bba5340ed4c9d71f4e4d75be4.JPG

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minnbuckeye
7 hours ago, Fossildude19 said:

The items in the first picture look like they are pyritized. Is the the case?

 

pyrite is very common in this quarry

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minnbuckeye
8 hours ago, Rockwood said:

The fragmented appearance in places gives the first one the look of plant material to me. Something like Psilophyton  perhaps.

 

Great try!! Looked up images and they do have a very similar  appearance. Unfortunately, from my understanding, the location, Central Iowa, was always submerged in the Devonian.

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Fossildude19

They look quite like the pyritized burrows found in the Devonian deposits in New York. 

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WhodamanHD

@minnbuckeye  sometimes plant material can find its way into ocean deposits, because of storms and such.

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Kane
Just now, Fossildude19 said:

They look quite like the pyritized burrows found in the Devonian deposits in New York. 

That was my thought, too. 

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WhodamanHD

Plant stem from middle Devonian sea deposits in Maryland.

IMG_1463.JPG

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Fossildude19

Yes, plant bits are common in New York Devonian marine environments, as well, ... however they tend to be like yours - imprints or carbonized films. 

Any pyrite on them is usually spotty, at best. 

I'm going with burrows on these. 

 

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minnbuckeye
9 hours ago, Fossildude19 said:

The first item looks like the pyritized burrows that I have found in the Middle Devonian of New York. 

The second item I have no idea. Any chance of breaking it along the edge of the circle, to see what it looks like inside??

My first thought was a burrow cast on that.   

Can we get better pictures of the last item?

To me, it looks like a modern lichen pattern?   :headscratch:

 

The second item was split in half. no structures were visible on the cross section. It is odd how the pattern emerges on the other side of the rock. Acid rain leaching through the rock?? LOL.

 

I took a knife to the last item. Lichen it is! Very distinctive pattern that I won't forget. Odd that it was in a pile of recently blasted material. It must have been on the exposed face of the blast site.

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minnbuckeye
1 minute ago, Fossildude19 said:

I'm going with burrows on these. 

 

 

I tend to agree. Anyways, my junk pile of rocks outside  just grew a little bigger today. 

Thanks for everyone's help.

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WhodamanHD

Btw I didn't find that plant

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Rockwood

Just a note to novices who might be looking in: Even if I were nearly certain of the worm burrow ID myself it would still be correct to bring up the alternative. 

I think this is a fine example of how we sort out the evidence and probabilities. :goodjob:

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