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Post by ammocarbsteve on Feb 16, 2011 12:31:26 GMT -5
Thanks Peter... Ive played my calamites trump cards... lets see what everyone else has got...
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Post by ammocarbsteve on Feb 17, 2011 6:03:52 GMT -5
Forgot the Annularia Attachments:
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Post by ammocarbsteve on Feb 17, 2011 6:04:29 GMT -5
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Post by ammocarbsteve on Feb 17, 2011 6:04:59 GMT -5
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Post by ammocarbsteve on Feb 17, 2011 6:05:29 GMT -5
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Post by ammocarbsteve on Feb 17, 2011 6:06:00 GMT -5
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Post by ammocarbsteve on Feb 17, 2011 6:06:31 GMT -5
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Post by Joe Botting on Feb 17, 2011 8:35:48 GMT -5
Just wanted to say this is an excellent thread... I'm dying to see what else you're all going to come up with. Anyone got any bulbils, for example?
Also, does Asterophyllites really count? I always thought it was a different, smaller horsetail, but I may be wrong...
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Post by ammocarbsteve on Feb 17, 2011 10:12:13 GMT -5
Joe.... The ''Paracalamostachys Spadiciformis'' like structure is infact thought to be a 'bulbil' and has all the neccesary cell components for rooting and growing into a new plant after it is dropped from the mature plant, perhaps drifting through the delta system until it reaches a margin. I say ''like structure'' as these examples I found are attached to very fine Asterophyllite stems where the one in the paper appears attached to a main shoot in the reconstruction....
Asterophyllites?... In Cleal & Thomas - Plant Fossils of the British Coal Measures in the description of Calamites it suggests ''The whorled leaves on the smaller branches are called Asterophyllites and Annularia.'' ...We have lots of names for lots of subtle variations of the same thing...I personally think that the Calamites tree like any plant could during growth modify its overall structure depending on the type of environment and conditions it was actually growing in… For example… if its growing in very soft sediments right on the edge of the delta system then the ground may be too soft to support a full sized tree of maximum dimensions as its purchase through the root system could be too weak not allowing a full canopy to develop … so using the same cells it uses for full size growth it ‘reads’ the environment its in as nature very cleverly does and then adjusts its approach and as a consequence it reduces its overall height which in turn has a knock on effect on distance between the nodes and branch spacings that we find preserved as fossils… If its growing in a more dense thicket of trees with inadequate spacings between the trees then it will obviously reach for the light and the distance between the nodes would be increased as upward growth gaining height to compete for light becomes the goal… me and Tim have had a similar discussion on TFF without all the new fossil specimens included....I look forward to seeing any further examples to... Thanks for your interest...
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Post by paleoflor on Feb 17, 2011 13:38:06 GMT -5
Steve, wonderful display of plant fossils and very informative explanation here at the end. Your bulbil-like structures continue to trigger interest. It will be difficult to really add something to this already impressive list of components, but these might be fun to include: Annularia stellata (France) Attachments:
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Post by paleoflor on Feb 17, 2011 13:38:47 GMT -5
Calamites goeppertii (Inner mould, Belgium) Attachments:
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Post by paleoflor on Feb 17, 2011 13:39:58 GMT -5
Calamites goeppertii (Outer mould, Germany) -- Note: outer moulds with such characteristic are something I'd like to know more of... Attachments:
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Post by paleoflor on Feb 17, 2011 13:40:39 GMT -5
Calamites carinatus (Side-branch scar, Netherlands) Attachments:
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Post by paleoflor on Feb 17, 2011 13:41:15 GMT -5
Calamites cisti (Germany) Attachments:
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Post by paleoflor on Feb 17, 2011 13:41:51 GMT -5
Calamites suckowii (Belgium) Attachments:
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