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Comptes Rendus Palevol
Volume 9, n° 6-7
pages 283-287 (septembre 2010)
Doi : 10.1016/j.crpv.2010.07.013
Received : 1 Mars 2010 ;  accepted : 30 July 2010
3D digital imaging of a concretion-preserved batoid (Chondrichthyes, Elasmobranchii) from the Turonian (Upper Cretaceous) of Morocco
Imagerie numérique 3D d’un batoïde (Chondrichtyens, Elasmobranches) préservé dans un nodule du Turonien (Crétacé supérieur) du Maroc
 

Kerin M. Claeson a, b, , David J. Ward c, Charlie J. Underwood d
a Department of Geological Sciences, The University of Texas at Austin, 1, University Station C1100, Austin, Texas 78712, USA 
b Center for Ecology & Evolutionary Studies, 228, Irvine Hall, Ohio University, Athens, OH 45701, USA 
c Crofton Court, 81, Crofton Lane, Orpington, Kent, BR5 1HB, UK 
d School of Earth Sciences, Birkbeck College, Malet Street, London WC1E 7HX, UK 

Corresponding author.
Abstract

We describe the manual and digital methods used to prepare an exceptional fossil specimen, as well as the composition of this specimen revealed by these methods. The fossil, a rhinobatoid, is 3-dimensionally preserved in a concretion. Fossils like these are seldom encountered, because flat-bodied animals are traditionally preserved in lithographic beds, or more commonly, are only represented by disassociated dentition. Manual preparation was best conducted with needles and a local application of buffered formic acid and neutralised sodium carbonate. High-resolution computed tomography and post-analysis using the invert ramp option in VGStudio Max 2.0 produced the best results to see the complete skeleton of this specimen. The specimen is distinguishable from the only other known 3D preserved fossil rhinobatoid, the Lower Cretaceous (Albian) genus †Iansan , and is probably a member of Platyrhinidae.

The full text of this article is available in PDF format.
Résumé

Nous décrivons ici les méthodes manuelles et numériques utilisées pour la préparation, l’observation et l’étude de la composition, d’un spécimen fossile exceptionnel. Ce fossile, un chondrichtyen rhinobatoïde, est préservé en trois dimensions dans une concrétion nodulaire. Une telle préservation est rare, car ces animaux à corps plat sont généralement retrouvés dans des niveaux lithographiques, ou plus communément par leurs restes dentaires isolés. La préparation manuelle de ce spécimen a été optimisée grâce à l’utilisation d’aiguilles et d’une application locale d’acide formique dilué et neutralisé avec du carbonate de sodium. Des acquisitions tomographiques à haute résolution et des analyses de post-traitement utilisant l’option d’histogramme inversé (invert ramp ) de VGStudio Max 2.0 ont produit les meilleurs résultats pour la visualisation du squelette complet de ce spécimen. Ce batoïde est différent du seul autre fossile de rhinobatoïde conservé en trois dimensions, le genre †Iansan du Crétacé inférieur (Albien), et est probablement un membre des Platyrhinidae.

The full text of this article is available in PDF format.

Keywords : Concretion, Computed tomography, Batoid, Formic acid, Cretaceous, Morocco

Mots clés : Concrétion nodulaire, Tomographie assistée par ordinateur, Batoïde, Acide formique, Crétacé, Maroc




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