TqB Posted May 19, 2016 Share Posted May 19, 2016 I found this Archaeocidaris (probably A. urii) plate last week and have already shown the little Fenestella on it. It's from the Brigantian of County Durham, UK. As well as plates and spines, it has some scattered Aristotle's lantern elements including teeth. Whole slab, with two complete teeth and one broken, arrowed in red (there are others). Other lantern elements and sundry small plates in the red oval. Tooth (the one on the right in photo 1). This seems large at about 4.5 mm across. Closeup of tooth tip: Area in oval on photo 1, showing other lantern elements with small peristomal plates scattered around. The large ear shaped piece at bottom right is an epiphysis from the lantern. 1 Tarquin Link to comment Share on other sites More sharing options...
JohnJ Posted May 19, 2016 Share Posted May 19, 2016 It is a beautiful specimen and great images, Tarquin. You enter another world when viewing it under magnification. (echinoid teeth) 1 The human mind has the ability to believe anything is true. - JJ Link to comment Share on other sites More sharing options...
doushantuo Posted May 19, 2016 Share Posted May 19, 2016 (edited) If you're interested Tarq http://rstb.royalsocietypublishing.org/content/royptb/223/494-508/617.full.pdf You are familiar with andy Smith's work.? Edited May 19, 2016 by doushantuo Link to comment Share on other sites More sharing options...
sixgill pete Posted May 19, 2016 Share Posted May 19, 2016 Amazing plate. So much going on in it. To me, that is a fantastic find, and like John said, it comes to life under magnification. Bulldozers and dirt Bulldozers and dirt behind the trailer, my desert Them red clay piles are heaven on earth I get my rocks off, bulldozers and dirt Patterson Hood; Drive-By Truckers May 2016 May 2012 Aug 2013, May 2016, Apr 2020 Oct 2022 Link to comment Share on other sites More sharing options...
Fossildude19 Posted May 19, 2016 Share Posted May 19, 2016 Wonderful plate, Tarquin. Thanks for showing it here. Regards, Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
TqB Posted May 20, 2016 Author Share Posted May 20, 2016 Thanks, everyone, it's a lot of fun with a binocular microscope. John - that's a great reference. There's an Archaeocidaris tooth SEM on p. 1160, text fig 9 that was my main identifying image. Doushantuo - some fine structural detail in that paper. I've a few of Andrew Smith's papers, including the one in John's link which has been invaluable. Tarquin Link to comment Share on other sites More sharing options...
Manticocerasman Posted May 20, 2016 Share Posted May 20, 2016 TqB, you got some nice Archaeocidaris there. Do you happen to have some info for the determination of such echinoderms? I found simmilar specimens in the Tournaissian in my area: growing old is mandatory but growing up is optional. Link to comment Share on other sites More sharing options...
JohnJ Posted May 20, 2016 Share Posted May 20, 2016 TqB, you got some nice Archaeocidaris there. Do you happen to have some info for the determination of such echinoderms? I found simmilar specimens in the Tournaissian in my area: Kevin, you'll like spending some time Here. 1 The human mind has the ability to believe anything is true. - JJ Link to comment Share on other sites More sharing options...
TqB Posted May 20, 2016 Author Share Posted May 20, 2016 TqB, you got some nice Archaeocidaris there. Do you happen to have some info for the determination of such echinoderms? I found simmilar specimens in the Tournaissian in my area: Thanks, Kevin. The NHM site that John gave the link to is good and has further references. Also very useful is Jackson's monograph from 1912, free pdf available here. https://archive.org/details/phylogenyofechini1912jack The plates are fabulous though some of them haven't digitised very well and I bought an original copy. Most of the European ones seem to get put in A. urii (Fleming, 1824), with the similar A. whatleyensis Lewis and Ensom added in 1982. The trouble is that you really need apical discs for classification and most of the material is disarticulated bits. 1 Tarquin Link to comment Share on other sites More sharing options...
Coco Posted May 21, 2016 Share Posted May 21, 2016 Here is a recent sea urchin mouth (Echinometra mathaei Artistotle's lantern) to compare : Coco 2 ---------------------- OUTIL POUR MESURER VOS FOSSILES : ici Ma bibliothèque PDF 1 (Poissons et sélaciens récents & fossiles) : ici Ma bibliothèque PDF 2 (Animaux vivants - sans poissons ni sélaciens) : ici Mâchoires sélaciennes récentes : ici Hétérodontiques et sélaciens : ici Oeufs sélaciens récents : ici Otolithes de poissons récents ! ici Un Greg... Link to comment Share on other sites More sharing options...
TqB Posted May 21, 2016 Author Share Posted May 21, 2016 Thanks, Coco! Tarquin Link to comment Share on other sites More sharing options...
doushantuo Posted May 21, 2016 Share Posted May 21, 2016 (edited) ecology: http://www.mapress.com/zoosymposia/content/2012/v7/f/v007p255-266.pdf facies,diagenesis(taphon.): http://www.nhm-wien.ac.at/jart/prj3/nhm/data/uploads/mitarbeiter_dokumente/kroh/2010/Kroh_et_Nebelsick_2010.pdf Edited May 21, 2016 by doushantuo Link to comment Share on other sites More sharing options...
Manticocerasman Posted May 26, 2016 Share Posted May 26, 2016 Thanks, Kevin. The NHM site that John gave the link to is good and has further references. Also very useful is Jackson's monograph from 1912, free pdf available here. https://archive.org/details/phylogenyofechini1912jack The plates are fabulous though some of them haven't digitised very well and I bought an original copy. Most of the European ones seem to get put in A. urii (Fleming, 1824), with the similar A. whatleyensis Lewis and Ensom added in 1982. The trouble is that you really need apical discs for classification and most of the material is disarticulated bits. Thanks for the info growing old is mandatory but growing up is optional. Link to comment Share on other sites More sharing options...
TqB Posted May 28, 2016 Author Share Posted May 28, 2016 I went back to the site a couple of days ago and found this small slab with one more Archaeocidaris tooth, probably from the same specimen. scale bar 1cm, next to tooth: tip: 1 Tarquin Link to comment Share on other sites More sharing options...
JohnJ Posted May 28, 2016 Share Posted May 28, 2016 More outstanding images. I understand. Thanks, Tarquin. The human mind has the ability to believe anything is true. - JJ Link to comment Share on other sites More sharing options...
TqB Posted May 29, 2016 Author Share Posted May 29, 2016 Thank you, John! Tarquin Link to comment Share on other sites More sharing options...
TqB Posted July 11, 2016 Author Share Posted July 11, 2016 (edited) A well preserved, 3D tooth on a small (4cm across) plate from the same site as the others, possibly even the same individual (which would make all five!). The tooth is on the left, with a spine and some plates. Closeup of tooth: Wetted to bring out contrast: Edited July 11, 2016 by TqB 1 Tarquin Link to comment Share on other sites More sharing options...
JohnJ Posted July 11, 2016 Share Posted July 11, 2016 Another excellent specimen, Tarquin. The human mind has the ability to believe anything is true. - JJ Link to comment Share on other sites More sharing options...
TqB Posted July 12, 2016 Author Share Posted July 12, 2016 Thanks, John! Just one more, apparently a juvenile unless there's a mini-species. The tooth here, in the red oval, at about 1mm across, is only about a quarter the size of the others . This is just a small area of a slab that has many small Archaeocidaris plates and spines (also a few Lepidesthes plates, generally unreported from the UK). Tarquin Link to comment Share on other sites More sharing options...
JohnJ Posted July 12, 2016 Share Posted July 12, 2016 Look at that little juvenile jewel.... Is this matrix difficult to work with? Looking forward to your next find. The human mind has the ability to believe anything is true. - JJ Link to comment Share on other sites More sharing options...
TqB Posted July 13, 2016 Author Share Posted July 13, 2016 Look at that little juvenile jewel.... Is this matrix difficult to work with? Looking forward to your next find. Thanks! - it's a limestone/shale interface (thin lenses of limestone) and all that's needed is a toothbrush. KOH and air abrading work well for anything that's under the surface. 1 Tarquin Link to comment Share on other sites More sharing options...
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