Rockin' Ric Posted September 27, 2012 Share Posted September 27, 2012 Here's 3 more. Pottsville Formation, Alabama USA. WELCOME TO ALL THE NEW MEMBERS! If history repeats itself, I'm SO getting a dinosaur. ~unknown www.rockinric81.wixsite.com/fossils Link to comment Share on other sites More sharing options...
nala Posted September 27, 2012 Author Share Posted September 27, 2012 A really great participation with stunning pictures!thanks to share Link to comment Share on other sites More sharing options...
BNN Posted September 27, 2012 Share Posted September 27, 2012 Lepidodendron aculeatum Pit 11 Mazon Creek Link to comment Share on other sites More sharing options...
nala Posted September 27, 2012 Author Share Posted September 27, 2012 Beware! the americans are waking up Very nice pattern for this Lepidodendron bark from Mazon Creek!Thanks to share BNN Link to comment Share on other sites More sharing options...
nala Posted September 27, 2012 Author Share Posted September 27, 2012 I found my fertile frond to keep things ticking over until Nala visits the quarry again .... If i could,i would run on the coal heap right now to find this! Link to comment Share on other sites More sharing options...
docdutronc Posted September 29, 2012 Share Posted September 29, 2012 (edited) Hi m friends last find this morning Liévin basin (France) a deep decortication ,Knorria Stigmaria with the central lignous cylinder Edited September 29, 2012 by docdutronc Link to comment Share on other sites More sharing options...
nala Posted September 29, 2012 Author Share Posted September 29, 2012 Nice find! Link to comment Share on other sites More sharing options...
docdutronc Posted September 29, 2012 Share Posted September 29, 2012 Thanks Nala Bruno Link to comment Share on other sites More sharing options...
Terry Dactyll Posted September 29, 2012 Share Posted September 29, 2012 Bruno.... Yikes... The preservation on that last Alethopteris is fabulous... Top Drawer! Cheers Steve... And Welcome if your a New Member... Link to comment Share on other sites More sharing options...
docdutronc Posted October 7, 2012 Share Posted October 7, 2012 two classic bark from Liévin basin ...... best regards Bruno Link to comment Share on other sites More sharing options...
docdutronc Posted October 8, 2012 Share Posted October 8, 2012 (edited) Adventitious roots on fern trunk from Liévin basin . Bruno Edited October 9, 2012 by docdutronc Link to comment Share on other sites More sharing options...
hitekmastr Posted October 8, 2012 Share Posted October 8, 2012 (edited) AHA! Really great images! I am still wondering if the "adventitious roots" are the same as the leaf-like appendages that grew directly out of the trunk - always looking for evidence that the trunk structures could become either leaf-like appendages/branches, or roots...if I were a primitive arborescent fern, I would have the same structures adaptable to above or below ground morphologies/functions, including adventitious roots seeking water or mud. It's not clear from the literature what the purpose and form of the long "grass-like appendages" described as coming directly from the trunk, are distinct from the rootlets, or if the same structures turned into either photosynthesis structures (maybe succulent) or branches/stems or rootlets...still seeking clarification but getting closer with every post, picture and email! By the way, did you see the posts about the boring insect holes in the bark? Those are really interesting and the discussion around what types of insects made those holes is cool - still thinking there must be more insect fossils at St. Clair, given all the plant material there. Edited October 8, 2012 by hitekmastr Link to comment Share on other sites More sharing options...
Auspex Posted October 10, 2012 Share Posted October 10, 2012 Is it supposed that the "adventitious roots" are from very low on the mature trunk? These are very, very interesting! "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...
docdutronc Posted October 10, 2012 Share Posted October 10, 2012 Hi Auspex quote : "Is it supposed that the "adventitious roots" are from very low on the mature trunk?" these roots were likely very dense in the lower part of the trunk forming a sleeve or jacket, they were more sparse in the upper region of the trunk.... Best regards Bruno Link to comment Share on other sites More sharing options...
docdutronc Posted October 11, 2012 Share Posted October 11, 2012 Some Sigillaria bark from Liévin basin Link to comment Share on other sites More sharing options...
Terry Dactyll Posted October 11, 2012 Share Posted October 11, 2012 Bruno... Yikes...What is the 2nd specimen and where on the tree would this reside or what has led to this patternation?... Thats very unusual... Cheers Steve... And Welcome if your a New Member... Link to comment Share on other sites More sharing options...
docdutronc Posted October 11, 2012 Share Posted October 11, 2012 (edited) Hi Steeve Undoubtedly one end of young sigillaria, likely decorticated, scars tend to weld to the top of the stem who is conical .. Best regards Bruno Edited October 11, 2012 by docdutronc Link to comment Share on other sites More sharing options...
Terry Dactyll Posted October 11, 2012 Share Posted October 11, 2012 Bruuno... Thanks... Thats a very unusual find... I'd be made up with that one... Cheers Steve... And Welcome if your a New Member... Link to comment Share on other sites More sharing options...
hitekmastr Posted October 11, 2012 Share Posted October 11, 2012 I have read in different books and articles that the number of leaf types and bark/trunk patterns don't match up - many more bark patterns than associated leaf types - does this mean the bark types and trees evolved while the leaves remained the same, or does it mean that there are more leaf types, or that the bark patterns and leaf types haven't been matched up or verified yet? Interested in any ideas why the paleobotanists say there are more bark patterns than leaf types...thx. Link to comment Share on other sites More sharing options...
AgrilusHunter Posted October 11, 2012 Share Posted October 11, 2012 I have read in different books and articles that the number of leaf types and bark/trunk patterns don't match up - many more bark patterns than associated leaf types - does this mean the bark types and trees evolved while the leaves remained the same, or does it mean that there are more leaf types, or that the bark patterns and leaf types haven't been matched up or verified yet? Interested in any ideas why the paleobotanists say there are more bark patterns than leaf types...thx. Maybe, just that on a given tree you could get multiple bark patterns from root to bole to tip but much lower variation in leaf morphology. "They ... savoured the strange warm glow of being much more ignorant than ordinary people, who were only ignorant of ordinary things." -- Terry Pratchett Link to comment Share on other sites More sharing options...
Auspex Posted October 11, 2012 Share Posted October 11, 2012 The thinking is that the lycopods had different "bark" patterns at different growth layers, which should also be evident from top to bottom. "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...
Terry Dactyll Posted October 11, 2012 Share Posted October 11, 2012 The thinking is that the lycopods had different "bark" patterns at different growth layers, which should also be evident from top to bottom. Couple this with decortications and variations in levels of preservation and we soon have a LOT of different looking specimens... Cheers Steve... And Welcome if your a New Member... Link to comment Share on other sites More sharing options...
docdutronc Posted October 11, 2012 Share Posted October 11, 2012 (edited) Hi Sometimes there are large variations in the same species, depending on the maturity, aging bark, their position at the top of the trunk, the condition of decortication, the taphonomy and conditions of fossilization are also factors multiplication of species and morphogenus ....... For leaves, specifically for the genus Sigillaria, they are often found detached, more rarely in connection, they vary little, except in length ...... Edited October 11, 2012 by docdutronc Link to comment Share on other sites More sharing options...
hitekmastr Posted October 11, 2012 Share Posted October 11, 2012 quote : "Is it supposed that the "adventitious roots" are from very low on the mature trunk?" these roots were likely very dense in the lower part of the trunk forming a sleeve or jacket, they were more sparse in the upper region of the trunk.... Auspex, Bruno... The downward slope of the appendages suggested the possibility of adventitious roots close to the bottom moving toward water or mud like mangroves - but most are broken off and you indicate they are high up on the trunk, which suggests that they may simply be flattened and pointed downward, but originally more perpendicular to the trunk (??). Link to comment Share on other sites More sharing options...
hitekmastr Posted October 11, 2012 Share Posted October 11, 2012 Couple this with decortications and variations in levels of preservation and we soon have a LOT of different looking specimens... ...not to mention that we are talking about millions of years and different climates and maybe adaptations to subtle climate changes that may not be apparent in the geology. When talking about a "narrow" geological period such as late Carboniferous, we're still talking about millions of years which allows for a lot of variation. Bird beaks can evolve differently in one season. Fern bark could be varying, given the times, although as many point out, "unforced" morphologies appear to remain intact pretty much indefinitely. And the variations in each tree (different leaves on the same tree for example and different bark patterns on the same tree) adds to the formula. We all expect things to be simple and complexity in biology is more the rule than exception! Link to comment Share on other sites More sharing options...
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