Terry Dactyll Posted November 20, 2011 Share Posted November 20, 2011 Bruno... Nice to see you back posting on the forum and very nice find...It looks very different preservation with the sandstone colour... I managed a paddle about in the mud today and I found something unusual for this location... at first I thought a species of Alethopteris but I am not sure now that I have photographed the leaf's close up... I would be grateful of any help with the ID's... A small I think Palaeostachya paucibracteata?... Cheers Steve... And Welcome if your a New Member... Link to comment Share on other sites More sharing options...
docdutronc Posted November 20, 2011 Share Posted November 20, 2011 (edited) Hi Steve not an Alethopteris fern but a Pecopteris fern like this one ......2a http://i40.servimg.c...73/img_6613.jpg http://i40.servimg.c...73/img_6614.jpg http://i40.servimg.c...73/img50110.jpg Here is a Lobatopteris (pecopteris )miltoni Artis from Lievin aera best regards Bruno Edited November 20, 2011 by docdutronc Link to comment Share on other sites More sharing options...
Terry Dactyll Posted November 20, 2011 Share Posted November 20, 2011 Bruno.... Thanks for pointing me in the right direction... Your specimens are very nice and all seem to have rounded tips to the leafs...This specimen has slightly pointed pinnules a little like 'Pecopteris plumosa'... Cheers Steve... And Welcome if your a New Member... Link to comment Share on other sites More sharing options...
docdutronc Posted November 21, 2011 Share Posted November 21, 2011 Bruno... Nice to see you back posting on the forum and very nice find...It looks very different preservation with the sandstone colour... http://i20.servimg.com/u/f20/13/00/15/73/conser10.jpg http://i40.servimg.com/u/f40/13/00/15/73/img_6617.jpg Yes Steve ,sometimes it looks very different preservation with sandstone colour ,here are Sigillaria ,Lepidophloios and lepidodendron bark ..... best regards Link to comment Share on other sites More sharing options...
Terry Dactyll Posted November 21, 2011 Share Posted November 21, 2011 Bruno... Great specimens... Obviously they are not quite as sharp as your shale specimens being from a rock with a larger grain size but still a very nice representation of another layer in your area... Nice finds Cheers Steve... And Welcome if your a New Member... Link to comment Share on other sites More sharing options...
docdutronc Posted November 26, 2011 Share Posted November 26, 2011 (edited) Hi Latest finding from Liévin aera best regards Bruno Edited November 26, 2011 by docdutronc Link to comment Share on other sites More sharing options...
Terry Dactyll Posted November 26, 2011 Share Posted November 26, 2011 Bruno.... Quite detailed Lepidodendron...Nice find... I wish I had got more bark samples from the last exposure when I had the chance... Cheers Steve... And Welcome if your a New Member... Link to comment Share on other sites More sharing options...
docdutronc Posted November 26, 2011 Share Posted November 26, 2011 Hi Steve "Quite detailed Lepidodendron" Lepidodendron ? I am not sure ,this bark shows very similar caracters with Synchysidendron from Riolamine USA ... best regards Bruno http://i60.servimg.com/u/f60/13/00/15/73/48_rio10.jpg Link to comment Share on other sites More sharing options...
docdutronc Posted November 27, 2011 Share Posted November 27, 2011 Hi my friends Here is a Sigillaria bark from Boussu aera in Belgium : Sigillaria polyploca Boulay . Link to comment Share on other sites More sharing options...
Terry Dactyll Posted November 28, 2011 Share Posted November 28, 2011 Hi Steve "Quite detailed Lepidodendron" Lepidodendron ? I am not sure ,this bark shows very similar caracters with Synchysidendron from Riolamine USA ... best regards Bruno http://i60.servimg.c...73/48_rio10.jpg Bruno... I have never heard of that bark... I presumed it was decorticated Lepidodendron Nice new Sigillaria find Cheers Steve... And Welcome if your a New Member... Link to comment Share on other sites More sharing options...
RomanK Posted November 28, 2011 Share Posted November 28, 2011 Hi Bruno! Nice Synchysidendron and Sigillaria finds, could you explain the main differences of the Synchysidendron from Lepidodendron bark, thanks. Roman http://s1143.photobu.../donbassfossil/ Link to comment Share on other sites More sharing options...
docdutronc Posted November 28, 2011 Share Posted November 28, 2011 Hi my friends I have explained in a previous post : Recent work of Professor DIMICHELE (1983/1985), of DIMICHELE and BATEMAN (1992) on many petrified specimens previously assigned to the genus Lepidodendron Sternberg let the authors to create new genus DIAPHORODENDRON and SYNCHYSIDENDRON from anatomical criteria essentially in structures preserved ,while recognizing that when the material is retained in compression, the distinction between types LEPIDODENDRON and DIAPHORODENDRON SYNCHYSIDENDRON becomes difficult. DIMICHELE (1985 page 452) estimates that a sample should be reported to the genus Lepidodendron when the characters meet the following : 1/rapport height / width of leaf bases is greater than or equal to 1 (rarely less than 1). 2/leaf bases radially thick ,bearing a median keel less ( cauda ) strongly marked with transverse striations . 3/presence of parichnos infrafoliars. -Among The french carboniferous samples in compression of the genus Synchysidendron , leaf bases are always higher than broad ,lack of parychnos infrafoliar . The essential relationships between different types SYNCHYSIDENDRON and DIAPHORODENDRON are anatomical and focus on how growth occurs and when the reproductive systems begin to develop and can be highlighted on the material held in compression and often distorted. -Several of my specimens show parichnos and thus correspond to such genus Lepidodendron, some have little relief, parichnos are absent and can be attributed to genus SYNCHYSIDENRON, but this is not a certainty, I hope I was clear in my explanation .... Link to comment Share on other sites More sharing options...
RomanK Posted November 29, 2011 Share Posted November 29, 2011 (edited) Thanks Bruno, just to add a couple of words from the abstract of that article: Synshysidendron is segregated from Diaphorodendron in that article. Both genera are determinate, rhizomorphic, arborescent, lycopsids that share identical reproductive organs but differ radically in grouth architecture and consecuently in the timing of reproduction. Cones in Synshysidendron are born on late-formed crown branches. In Diaphorodendron cones are born on deciduous lateral branches, produced over much of the life of the tree. Is that the same species or just much decorticated Lepidodendron? Edited November 29, 2011 by RomanK Roman http://s1143.photobu.../donbassfossil/ Link to comment Share on other sites More sharing options...
Terry Dactyll Posted November 29, 2011 Share Posted November 29, 2011 Roman & Bruno... thanks for the education guys Cheers Steve... And Welcome if your a New Member... Link to comment Share on other sites More sharing options...
RomanK Posted November 29, 2011 Share Posted November 29, 2011 Roman & Bruno... thanks for the education guys Steve, look at the my last modified post, do you think that specimen is the same species as Bruno's one? Roman http://s1143.photobu.../donbassfossil/ Link to comment Share on other sites More sharing options...
docdutronc Posted November 29, 2011 Share Posted November 29, 2011 (edited) Hi my friends And also similar to this one ,Collection from my friend : Jean Philippe Dud. , perhaps a Synchysidendron or a partial decorticated Lepidodendron bark ??? Bruno Edited November 29, 2011 by docdutronc Link to comment Share on other sites More sharing options...
astron Posted November 29, 2011 Share Posted November 29, 2011 Bruno, Steve, Roman! One more thanks for this wonderful and educative topic I always admire your high quality finds, dialogs and infos The only I could add is that this synchysidendron rather fairly confuses, as I conclude from their greek name meaning ''confusing tree'' Astrinos P. Damianakis Link to comment Share on other sites More sharing options...
RomanK Posted November 30, 2011 Share Posted November 30, 2011 Thank you Astrinos for your kind reply Roman http://s1143.photobu.../donbassfossil/ Link to comment Share on other sites More sharing options...
Terry Dactyll Posted November 30, 2011 Share Posted November 30, 2011 Steve, look at the my last modified post, do you think that specimen is the same species as Bruno's one? Roman... Proportionally I think your specimen looks identical to Bruno's... although your specimen is showing a lot more preserved detail... I think there's a LOT of crossover with ever so slight variations in the ID of carb plant material as we attempt to name and classify every fossil that we find...where infact a lot of it could literally be due to factors such as variations/fluctuations in growing conditions... as we have discussed before... Cheers Steve... And Welcome if your a New Member... Link to comment Share on other sites More sharing options...
RomanK Posted November 30, 2011 Share Posted November 30, 2011 Roman... Proportionally I think your specimen looks identical to Bruno's... although your specimen is showing a lot more preserved detail... I think there's a LOT of crossover with ever so slight variations in the ID of carb plant material as we attempt to name and classify every fossil that we find...where infact a lot of it could literally be due to factors such as variations/fluctuations in growing conditions... as we have discussed before... Steve I agree with your statement. Roman http://s1143.photobu.../donbassfossil/ Link to comment Share on other sites More sharing options...
RomanK Posted December 3, 2011 Share Posted December 3, 2011 That is the combination of my Lepidodendron finds, which has kind of shield covered the leaf scar. Roman http://s1143.photobu.../donbassfossil/ Link to comment Share on other sites More sharing options...
Terry Dactyll Posted December 3, 2011 Share Posted December 3, 2011 Roman.... They look unusual and all slightly different but I see what you mean about the shield covering the leaf scar...Nice, I have not found this on mine. Cheers Steve... And Welcome if your a New Member... Link to comment Share on other sites More sharing options...
RomanK Posted December 4, 2011 Share Posted December 4, 2011 Roman.... They look unusual and all slightly different but I see what you mean about the shield covering the leaf scar...Nice, I have not found this on mine. Thank you Steve, yes, all of them have an obvious "lower" keel but you can't see the leaf scars and "upper" keel at all for some reasons. Roman http://s1143.photobu.../donbassfossil/ Link to comment Share on other sites More sharing options...
docdutronc Posted December 4, 2011 Share Posted December 4, 2011 Hi Steve and Roman here is a Lepidodendron bark (counter part) the leaf cushion show partial decortication ,like small shield covering the leaf scar ,it is very similar !!!! Best regards Bruno Link to comment Share on other sites More sharing options...
RomanK Posted December 4, 2011 Share Posted December 4, 2011 (edited) Hi Steve and Roman here is a Lepidodendron bark (counter part) the leaf cushion show partial decortication ,like small shield covering the leaf scar ,it is very similar !!!! Best regards Bruno Hi Bruno, thank you. Do you think that shield is a result of plant cortex delelopment or just decortication effect? Edited December 4, 2011 by RomanK Roman http://s1143.photobu.../donbassfossil/ Link to comment Share on other sites More sharing options...
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