docdutronc Posted December 17, 2015 Author Share Posted December 17, 2015 Lepidostrobophyllum Link to comment Share on other sites More sharing options...
Plantguy Posted December 23, 2015 Share Posted December 23, 2015 Lepidostrobophyllum IMG_34781.jpg 3.jpg Hey Bruno, interesting to see how the cone just seems to fall apart. I especially like the two bracts that I circled that are still attached. Regards, Chris Link to comment Share on other sites More sharing options...
docdutronc Posted December 24, 2015 Author Share Posted December 24, 2015 Hy Chris thank for your comment ,here I think to observe a piece of Lepistrobophyllum axis !!! Joyeux Nöel Bruno 1 Link to comment Share on other sites More sharing options...
paleoflor Posted January 4, 2016 Share Posted January 4, 2016 Beautiful specimens, as always. Thanks for sharing these, Bruno. Best wishes for 2016! Searching for green in the dark grey. Link to comment Share on other sites More sharing options...
Plantguy Posted January 5, 2016 Share Posted January 5, 2016 Hy Chris thank for your comment ,here I think to observe a piece of Lepistrobophyllum axis !!! Joyeux Nöel Bruno IMG_34781 - Copie.jpg Hi Bruno, I saw the pattern, but didnt recognize it...thought it was a small Lepidodendron twig. Thanks for pointing that out. Very nice plate! Regards, Chris Link to comment Share on other sites More sharing options...
docdutronc Posted January 29, 2016 Author Share Posted January 29, 2016 First field trip 2016 , Cordaites already Cordaites ! Link to comment Share on other sites More sharing options...
docdutronc Posted January 29, 2016 Author Share Posted January 29, 2016 more closeup Link to comment Share on other sites More sharing options...
docdutronc Posted January 29, 2016 Author Share Posted January 29, 2016 Decomposition or maceration ? Link to comment Share on other sites More sharing options...
paleoflor Posted January 29, 2016 Share Posted January 29, 2016 Nice start of the year! Could the "decomposition" or "maceration" be related to tectonic deformation of the sediments containing the plant specimens? Not sure how much these sediments were affected by the formation of the Alps, but I can imagine they didn't get off very lightly... Some of the structures "in the leaves" seem to transgress into the rock matrix, which in general shows a rather similar texture anyway. Just a thought. Searching for green in the dark grey. Link to comment Share on other sites More sharing options...
Plantguy Posted January 31, 2016 Share Posted January 31, 2016 Hey Bruno, very nice material. congrats. Yes I agree with Tim...the fracture patterns seem to run thru the matrix and impression. Seems to maybe imply a local or regional stress as opposed to decomposition. I suppose though that some measure of both could have occurred as well. I'll shoot a note out and see if I can glean any additional confirmation. When you find specimens like these in situ do you take strike/slip measurements and note fossil orientation details within the bedding planes---am curious if geologic maps of the area show any local or regional deformation patterns? Regards, Chris Link to comment Share on other sites More sharing options...
docdutronc Posted February 2, 2016 Author Share Posted February 2, 2016 Chris Yes ,the carboniferous shales with plant remains are in contact with metamorphic shales ,and some of them are affected with deformation , the local Asturian orogenic phase is also a factor of contrain. Bruno Link to comment Share on other sites More sharing options...
Plantguy Posted February 3, 2016 Share Posted February 3, 2016 Chris Yes ,the carboniferous shales with plant remains are in contact with metamorphic shales ,and some of them are affected with deformation , the local Asturian orogenic phase is also a factor of contrain. Bruno Hey Bruno, thanks! I happened to shoot a note to Dr.DiMichele with your photos yesterday and already got a reply today to help us. Here it is... I believe the wrinkles in the cordaitalean leaves, which are very nice specimens, by the way, are probably caused by undulations in the original leaf. Cordaitalean leaves were probably rather stiff, not droopy as shown in a lot of reconstructions. And developmentally, leaves such as this can have natural undulations across their surfaces. A place to take a look is at a modern bird’s nest fern, Asplenium nidus. The venation is not cordaitalean-like, but the leaves are long and tongue shaped and rather stiff. Many leaves are perfectly smooth. But others have small surface undulations. Where such mildly undulatory leaves to be flattened, some distortion could occur. This might depend on how long they were macerated in water, wherein bacterial action might soften them up a bit. I have seen cordaitalean leaves, as I am sure you and many of your colleagues have, that are so macerated the veins are splayed out and must have been floating freely in the water prior to burial. So, there is probably an optimal amount of maceration that would preserve various features, from none to too much. So, there is a working hypothesis anyway. There are other possible explanations, or course. The rock does not appear to be metamorphosed, at least not in a way where there are lineations that line up with the undulations in the leaves. Neither do there appear to be other fossils underlying the leaves, which might have impressed themselves on the cordaitalean leaf surface under compression. I've sent him a note thanking him. Keep finding more great material for us to look at and wonder about! Regards, Chris Link to comment Share on other sites More sharing options...
docdutronc Posted February 3, 2016 Author Share Posted February 3, 2016 (edited) Hi Chris the maceration hypothesis is confirmed by these samples ( collection Didier Rastel ,one of my field trip friend ) same outcrop. Note the presence of Pyrite who gives a nice contrast . No deformation affects the shale . Best regards Bruno Edited February 3, 2016 by docdutronc Link to comment Share on other sites More sharing options...
Terry Dactyll Posted February 5, 2016 Share Posted February 5, 2016 Hi Bruno.... Some great specimens there... I look forward to seeing more.... Cheers Steve... And Welcome if your a New Member... Link to comment Share on other sites More sharing options...
docdutronc Posted February 5, 2016 Author Share Posted February 5, 2016 Calamites multiramis Weiss 1 Link to comment Share on other sites More sharing options...
docdutronc Posted February 5, 2016 Author Share Posted February 5, 2016 Lepidodendron bark , part and counterpart . Link to comment Share on other sites More sharing options...
Auspex Posted February 5, 2016 Share Posted February 5, 2016 Calamites multiramis Weiss IMG_35621.jpg IMG_35601.jpg This is quite wonderful "There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant “Try to learn something about everything and everything about something.” - Thomas Henry Huxley >Paleontology is an evolving science. >May your wonders never cease! Link to comment Share on other sites More sharing options...
Plantguy Posted February 6, 2016 Share Posted February 6, 2016 Hi Chris the maceration hypothesis is confirmed by these samples ( collection Didier Rastel ,one of my field trip friend ) same outcrop. Note the presence of Pyrite who gives a nice contrast . No deformation affects the shale . Best regards Bruno vol_9111.jpg Wow, isnt that spectacular! Regards, Chris Link to comment Share on other sites More sharing options...
docdutronc Posted February 8, 2016 Author Share Posted February 8, 2016 Quote of my friend Didier " Here is a transversally folded tip Cordaitalean leaf. No other fold visible. It strengthens the hypothesis of leaf changes before fossilization." Same outcrop . Link to comment Share on other sites More sharing options...
paleoflor Posted February 8, 2016 Share Posted February 8, 2016 Quote of my friend Didier " Here is a transversally folded tip Cordaitalean leaf. No other fold visible. It strengthens the hypothesis of leaf changes before fossilization." Same outcrop. That's what I call impressive evidence! Beautiful specimen. Searching for green in the dark grey. Link to comment Share on other sites More sharing options...
Plantguy Posted February 9, 2016 Share Posted February 9, 2016 Quote of my friend Didier " Here is a transversally folded tip Cordaitalean leaf. No other fold visible. It strengthens the hypothesis of leaf changes before fossilization." Same outcrop . vol_9410.jpg Yes, that is a very nice specimen! Regards, Chris Link to comment Share on other sites More sharing options...
docdutronc Posted February 18, 2016 Author Share Posted February 18, 2016 (edited) The left sample shows the outer bark of Calamites multiramis Weiss , the phyllotaxy is very similar to that one perceives to the internal compression mold ( the right side sample ) Best regards Bruno Edited February 18, 2016 by docdutronc Link to comment Share on other sites More sharing options...
docdutronc Posted March 19, 2016 Author Share Posted March 19, 2016 Lepidodendron dichotomy Link to comment Share on other sites More sharing options...
docdutronc Posted March 19, 2016 Author Share Posted March 19, 2016 Pecopteris foliage Link to comment Share on other sites More sharing options...
docdutronc Posted March 19, 2016 Author Share Posted March 19, 2016 Lepidodendron bark Link to comment Share on other sites More sharing options...
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