tag:blogger.com,1999:blog-2199690829757615038.post7328910283203698831..comments2023-10-30T08:45:23.565-07:00Comments on Triassic critters, Madygen & Co.: Tectonics & Paleo (III):The shearing of fossils and how to reverse itMichael BWhttp://www.blogger.com/profile/12761074196100403445noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-2199690829757615038.post-43398038419010746242008-12-01T15:46:00.000-08:002008-12-01T15:46:00.000-08:00Thanks for the refs - as I wasn't really bothered ...Thanks for the refs - as I wasn't really bothered with tectonic deformation in vertebrates till now (and not much with insects either), the papers were in fact new to me.<BR/><BR/>Scanned them through - apparently the authors are not using much of a statistical approach as the number of individuals is rather not sufficient for that.Michael BWhttps://www.blogger.com/profile/12761074196100403445noreply@blogger.comtag:blogger.com,1999:blog-2199690829757615038.post-37181392693171707222008-11-29T12:53:00.000-08:002008-11-29T12:53:00.000-08:00Here are a couple of papers on retrodeforming vert...Here are a couple of papers on retrodeforming vertebrates (I'm sure you've already seen them):<BR/><BR/>Angielczyk, K.D., and H.D. Sheets. 2007. Investigation of simulated tectonic deformation in fossils using geometric morphometrics. <I>Paleobiology</I> 33(1):125–148. DOI: <A HREF="http://dx.doi.org/10.1666/06007.1" REL="nofollow">10.1666/06007.1</A><BR/><BR/>Motani, R. 1997. New technique for retrodeforming tectonically deformed fossils, with an example for ichthyosaurian specimens. <I>Lethaia</I> 30(3):221-228. <A HREF="http://www3.interscience.wiley.com/journal/119151418/abstract" REL="nofollow">Link</A><BR/>(the DOI doesn't seem to work)<BR/><BR/>Boyd, A.A., and R. Motani. 2008. Three-dimensional re-evaluation of the deformation removal technique based on "jigsaw puzzling". <I>Palaeontologia Electronica</I> 11(2):7A, 7 p. <A HREF="http://palaeo-electronica.org/2008_2/131/index.html" REL="nofollow">Link</A>220myahttps://www.blogger.com/profile/06403919493457640549noreply@blogger.comtag:blogger.com,1999:blog-2199690829757615038.post-66537964352433062992008-11-23T19:02:00.000-08:002008-11-23T19:02:00.000-08:00Ah, thanks for the feedback! (And that it is posit...Ah, thanks for the feedback! (And that it is positive.)<BR/><BR/>I didn't realize that plastic deformation is a large problem for old vertebrate skulls, imagined that they are rather brittly deformed, i.e. gone to pieces ... so you better find the left and right halves of the same skull in order to have some indication of the sort of deformation.<BR/><BR/>(I'm also working on vertebrates but there is still much work to be done before I have further news on that.)Michael BWhttps://www.blogger.com/profile/12761074196100403445noreply@blogger.comtag:blogger.com,1999:blog-2199690829757615038.post-76185933239868236022008-11-21T15:26:00.000-08:002008-11-21T15:26:00.000-08:00I've really enjoyed all of your posts - keep them ...I've really enjoyed all of your posts - keep them coming! I do vertebrate paleontology, but I really really enjoy reading posts about other aspects of the Triassic. And, Madygen is such a famous but also unknown locality that its really valuable and exciting to learn about it.<BR/><BR/>Insect wings are certainly easy to retro-deform compared to most vertebrates! A textbook example of plastic deformation wreaking havoc with systematics is the archosaur group Parasuchia (phytosaurs). A completely undeformed skull specimen may not exist.220myahttps://www.blogger.com/profile/06403919493457640549noreply@blogger.com