Publication: Ensayo de intervención en los macrofósiles de vertebrados de
los yacimientos de las “Hoces de Beteta” (Cuenca, España)
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Publication Date
2021
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Sociedad Geológica de España.
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Abstract
Las distintas intervenciones realizadas hasta la fecha en los yacimientos paleontológicos de las “Hoces de Beteta” han permitido recuperar, además de numerosos microfósiles y macrorrestos de invertebrados, diversos restos de vertebrados. Con el objetivo de desarrollar una capacidad de análisis que permita argumentar, en términos precisos, las decisiones tomadas con respecto al proceso restaurador más adecuado para la preparación y conservación de los ejemplares óseos obtenidos, entre éstos, se ha seleccionado, por su representatividad, un fósil procedente del yacimiento de Vadillos-1. El ejemplar elegido, correspondiente a un resto postcraneal de Dinosauria, se encontraba en un estado de preservación relativamente bueno, pero partido en siete fragmentos, presentándose uno de ellos parcialmente recubierto por una concreción carbonatada de elevada consistencia. A este fragmento se le han aplicado ciclos experimentales de limpieza química y mecánica, estableciéndose tratamientos con ácido clorhídrico (HCl) diluido del 15 al 5%, en intervalos de tiempo de 1 a 72h, seguidos de ensayos de eliminación de la matriz mediante aguja percutora. Finalizada la limpieza química y mecánica, se ha procedido a realizar una valoración estimativa de los ciclos desarrollados, mostrándose más eficaces los que incluyen un tratamiento químico más prolongado con ácido más diluido. Por último, los siete fragmentos se han unido mediante un adhesivo concentrado reversible, quedando el resto óseo siglado y depositado en condiciones de preservación adecuadas.
The different interventions carried out to date at the palaeontological sites of the “Hoces de Beteta” have allowed to recover, along with numerous microfossils and invertebrate macroremains, diverse vertebrate remains. Aiming to develop the analysis capacity which will allow to argument, in precise terms, the decisions made concerning the most appropriate restoration process for the preparation and preservation of the obtained bone specimens, among these, it has been selected, and due its representativeness, a fossil from the Vadillos-1 site. The chosen specimen corresponds to a postcranial remain of Dinosauria, which was in an adequate preservation state, but fragmented in seven pieces, one of them partially covered by a highly consistent carbonate concretion. Five experimental cycles of chemical and mechanical cleaning have been carried through to this piece, stablishing treatments with hydrogen chloride (HCI) diluted from 15 to 5%, in temporal intervals from 1 to 72h, followed by matrix elimination tests with a hand engraver. Once finished the chemical and mechanical cleaning, an estimative assessment of the developed cycles has been carried out, showing as more efficient those which include a more prolonged chemical treatment with more diluted acid. Finally, the seven fragments have been put together using reversible concentrated adhesive, remaining the specimen labelled and deposited in suitable preservation conditions.
The different interventions carried out to date at the palaeontological sites of the “Hoces de Beteta” have allowed to recover, along with numerous microfossils and invertebrate macroremains, diverse vertebrate remains. Aiming to develop the analysis capacity which will allow to argument, in precise terms, the decisions made concerning the most appropriate restoration process for the preparation and preservation of the obtained bone specimens, among these, it has been selected, and due its representativeness, a fossil from the Vadillos-1 site. The chosen specimen corresponds to a postcranial remain of Dinosauria, which was in an adequate preservation state, but fragmented in seven pieces, one of them partially covered by a highly consistent carbonate concretion. Five experimental cycles of chemical and mechanical cleaning have been carried through to this piece, stablishing treatments with hydrogen chloride (HCI) diluted from 15 to 5%, in temporal intervals from 1 to 72h, followed by matrix elimination tests with a hand engraver. Once finished the chemical and mechanical cleaning, an estimative assessment of the developed cycles has been carried out, showing as more efficient those which include a more prolonged chemical treatment with more diluted acid. Finally, the seven fragments have been put together using reversible concentrated adhesive, remaining the specimen labelled and deposited in suitable preservation conditions.