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Missourian

Show Us Your Cordaites

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Terry Dactyll

itwasntme... Very nice specimens... I've trimmed a couple of my carb plant finds down into circles as it happens :) but they are ideal drawer specimens... I think photo number 5 (the white blob) could possibly be a coprolite...

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Missourian

Cool drill cores.

We need a dill core thread.

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Roanoker

Cool drill cores.

We need a dill core thread.

Will any kind of pickle suffice? :)

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Auspex

Will any kind of pickle suffice? :)

:P

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Missourian

*Cough* Some jerk spilled coffee on the keyboard *cough*

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docdutronc

Hi my friends

How to interpret these strange structures on this Cordaites leaf , predation or decomposition ???

Best regards

Bruno

015_mo10.jpg

013_mo10.jpg

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Auspex

To me, they look like post-depositional, pre-fossilization deformation. Given the piles of debris that must have accumulated in these coal swamps, it is a wonder that we do not see more of this; perhaps it represents a more violent incident?

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Missourian

Are there small concretions in the rock? They could be distortion of the soft sediment around already-formed concretions during compaction.

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docdutronc

inconn10.jpg

quote : "They could be distortion of the soft sediment around already-formed concretions during compaction."

the red colour shows mineral siderore

like this one ,nodule or concretion under the leaf ????

Best regards

Bruno

Edited by docdutronc

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RomanK

My last find - Cordaites stem

post-814-0-13646700-1351419062_thumb.jpg

I have changed my ID after consultation with Bruno ("docdutronc"), that is the old arborescent fern stem. Excuse me for the wrong topic downloading.

Edited by RomanK

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docdutronc

Hi Roman

Cordaites trunk or ferns trunk !!!!!

difficult to say, but probably a basal part of the trunk, the furrows are rougher on your specimen, trunk fern or Cordaites???? , Old bark in any case, I think Cordaites are smoother .....

Best regards

Bruno

img_4817.jpg

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RomanK

Thank you Bruno!

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Missourian
On 10/26/2012 at 2:10 PM, docdutronc said:

quote : "They could be distortion of the soft sediment around already-formed concretions during compaction."

the red colour shows mineral siderore

like this one ,nodule or concretion under the leaf ???

 

Yes. I'm thinking something like this:

 

post-6808-0-17319100-1351465013_thumb.png

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docdutronc

Hi Missourian

very good explanation !!!!

best regards

Bruno

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Terry Dactyll

Roman... Thats a great new find... well done...

I like Missourian's explanation as well... although I struggle with the uniformity aspect of the nodules... localised mineral levels would vary producing many different sizes of nodule.. (or) the nodules form around something of a regular size and so become a regular shape?

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docdutronc

Quote : "although I struggle with the uniformity aspect of the nodules."

The consistency of these nodules ,and its particularly uniformity that my eye was drawn to the field, it is for this reason that I collected this specimen, the combination of a Cordaites leaf and unknown form was very attractive, a single nodule I will not have it picked up .....

Best regards

Bruno

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RomanK

Quite interesting texture of the bark accompanied by Cordaites leaves.

post-814-0-51541000-1351601702_thumb.jpg

Edited by RomanK

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Missourian

A close-up of the leaf bundle at the start of the thread:

post-6808-0-18445700-1356473280_thumb.jpg

Closer still:

post-6808-0-66881800-1356429443_thumb.jpg

Area of super close-up:

post-6808-0-44133900-1356429762_thumb.jpg

Edited by Missourian

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