RT Journal Article T1 Estudio sobre la evolución de Ictiorrestos en pizarras bituminosas T1 Study of the Ichthyorests evolution in oil shales A1 Suárez Ruiz, I. A1 Prado, J. G. AB The morphology, texture and some optical. properties (reflectance and fluorescence), of the Ichthyorests (fish scales) have been studied in two series of bituminous shales; one of the Westphalian of Scotland and other of the Pliensbachlan of Asturias and Cantabria. Furthermore, an artificial thermal maturation on immature samples of the Jurassic series has been carried out. The set of results compared with the optical properties of the vitrinite of the same samples permits to establish a possible thermal evolution parameter for the ichthyorests in cases of absence of vitrinite PB Sociedad Geológica de España YR 1996 FD 1996 LK http://hdl.handle.net/10272/12285 UL http://hdl.handle.net/10272/12285 LA spa DS Repositorio Institucional de la Universidad de Huelva RD 30 may 2026