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Post by paleoflor on Feb 10, 2011 13:36:45 GMT -5
Dicroidium dubium (Feistmantel) Gothan, 1912My first post with a picture, to test how the forum works. The specimen comes from the Triassic of Australia. However, I am not sure whether the image will actually be visible when I post the message. We'll see whether I did this correctly or not... Attachments:
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Post by pleecan (Peter Lee) on Feb 10, 2011 14:03:09 GMT -5
Yes he picture looks fine! Thanks for posting Tim.
Peter
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Post by Joe Botting on Feb 10, 2011 19:33:07 GMT -5
Very nice... pteridophyte or pteridosperm?
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Post by paleoflor on Feb 11, 2011 2:49:09 GMT -5
Hi Joe, The fossil genus Dicroidium is the foliage associated with the Umkomasiales (sometimes alternatively known as the corystosperms). Characteristic for the group is the basal dichotomy (see picture). Fronds can be either singular, monopinnate or bipinnate. This is a group of Mesozoic gymnosperms that remains rather enigmatic (anatomical details are often still poorly known). Surely not Pteridophyta though. Dicroidium is a dominant component of Triassic-Jurassic floras on the continents that once made up Gondwana. However, the oldest specimens to date come from the Permian of the Middle East if I remember correctly. More information on the Triassic of Nymboida can be found in a series of papers by W.B.K. (Keith) Holmes. Cheers, Tim Attachments:
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Post by Joe Botting on Feb 12, 2011 4:56:40 GMT -5
Interesting - it's a group I've not come across before! Thanks for that.
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