Papers by Ricard Martinez
Spanish Journal of Palaeontology
Desde el Cenomaniense superior al Santoniense de la región Vascocantábrica se reconocen quince un... more Desde el Cenomaniense superior al Santoniense de la región Vascocantábrica se reconocen quince unidades bioestratigráficas basadas en ammonites, doce en inocerámidos, siete en foraminíferos planctónicos y tres en nanofósiles calcáreos (Cenomaniense-Coniaciense inferior). La integración de estos datos permite caracterizar con cierta precisión estos pisos y algunos de sus límites.
Carnets de géologie (Notebooks on geology), 2013
Spanish Journal of Palaeontology, 2020
Este estudio trata de la fauna de desmocerátidos del Aptiense inferior de la subcuenca de Oliete ... more Este estudio trata de la fauna de desmocerátidos del Aptiense inferior de la subcuenca de Oliete (provincia de Teruel). La revisión taxonómica de estos ammonites, bien situados bioestratigráficamente, permite dos precisiones. La definición de Pseudosaynella raresulcata (d’Orbigny, 1841), Pseudosaynella bicurvata (Michelin, 1838) y de Pseudohaploceras liptoviensis (Zeuschner, 1856) se realizó a partir de pocos ejemplares, sin tener en cuenta sus variaciones ontogenéticas. En este trabajo se amplía el conocimiento de estas especies desde el punto de vista sistemático y taxonómico. En segundo lugar se precisa la posición bioestratigráfica, en especial de las especies del género Pseudosaynella, correlacionando su distribución estratigráfica con las biozonas de ammonites estándar de la provincia faunística Mediterránea para el Aptiense inferior.
Luxuriant, bushy antlers, bizarre crests, and huge, twisting horns and tusks are conventionally u... more Luxuriant, bushy antlers, bizarre crests, and huge, twisting horns and tusks are conventionally understood as products of sexual selection. This view stems from both direct observation and from the empirical finding that the size of these structures grows faster than body size (i.e., ornament size shows positive allometry). We contend that the familiar evolutionary increase in the complexity of ornaments over time in many animal clades is decoupled from ornament size evolution. Increased body size comes with extended growth. Since growth scales to the quarter power of body size, we predicted that ornament complexity should scale according to the quarter power law as well, irrespective of the role of sexual selection in the evolution and function of the ornament. To test this hypothesis, we selected three clades (ammonites, deer, and ceratopsian dinosaurs) whose species bore ornaments that differ in terms of the importance of sexual selection to their evolution. We found that the exponent of the regression of ornament complexity to body size is the same for the three groups and is statistically indistinguishable from 0.25. We suggest that the evolution of ornament complexity is a by-product of Cope’s rule. We argue that although sexual selection may control size in most ornaments, it does not influence their shape
The report of this chairman about it was sent to 48 persons: EO Amon, JA Arz, H. Bailey, JP Belli... more The report of this chairman about it was sent to 48 persons: EO Amon, JA Arz, H. Bailey, JP Bellier, P. Bengtson, V. Beniamovskii, M. Bilotte, Ch. Colom, M. Floquet, A. Gale, LT Gallagher, J. Gallemí, R. Gambashidze, S. Gardin, D. Gaspard, KW Graefe, J. Haggart, M. Hampton, T. Hasegawa, J. Ion, J. Jagt, C. Johnson, E. Kauffman, J. Kennedy, L. Kopaevich, MA Lamolda, J. Lees, G. López, R. Martínez, MC Melinte, S. Monechi, R. Mortimore, Ch. Neumann, Ch.Paul, D. Peryt, MR Petrizzo, JM Pons, I. Premoli Silva, F. Robaszynski, J. ...
The basal age of the Escucha Formation of the Maestrat basin has been object of diverse age inter... more The basal age of the Escucha Formation of the Maestrat basin has been object of diverse age interpretation ranging from the Upper Aptian to the Upper Albian. In the depocentre of the Maestrat basin, in the Salzedella sub-basin, the Escucha formation presents ammonoids record in his basal part. In order to revise the age of this formation, the ammonoids studied previously by other authors, the unpublished material from private collections, and specimens collected while the section was logged, have been studied. The study of these ammonoids has allowed us to recognize an association with profusion of engonoceratids, Parengonoceras caneroti Collignon, together with some douvilleiceratids and hypacanthoplitids. The biostratigraphic analysis and comparison with other similar faunas from France, England and Tunisia allow to date the assemblages to the Early Albian (Leymeriella tardefurcata Zone and probably lower part of the Douvilleiceras mammillatum Zone).
i interpretar els processos evolutius tal com els reflexa el registre fòssil. Conèixer les princi... more i interpretar els processos evolutius tal com els reflexa el registre fòssil. Conèixer les principals extincions del passat i els grups orgànics afectats en cada cas. Analitzar la influència dels canvis ambientals en els processos evolutius. Valorar les relacions entre les extincions i les radiacions posteriors. Manejar adequadament els conceptes bàsics en biostratigrafia. Conèixer els fòssils d'interès biostratigràfic. UAB 1/4
Journal of Iberian Geology, 2014
A review of the stratigraphic distribution of ammonoid species in the Lower Cretaceous (Hauterivi... more A review of the stratigraphic distribution of ammonoid species in the Lower Cretaceous (Hauterivian-Albian) of the Maestrat Basin (E Spain) was carried out. The specimens were mainly collected in the field by us and are stored in university or museum collections. Specimens from private collections and figured in the literature were also studied. We recognized 73 species that are distributed, in accordance with the latest version of the standard Mediterranean ammonite zonation for the Lower Cretaceous, in 14 ammonite zones: Acanthodiscus radiatus, Crioceratites loryi, Lyticoceras nodosoplicatum (Lower Hauterivian); Pseudothurmannia ohmi (Upper Hauterivian); Imerites giraudi (Upper Barremian); Deshayesites oglanlensis, Deshayesites forbesi, Deshayesites deshayesi, Dufrenoyia furcata (Lower Aptian); Epicheloniceras martini, Parahoplites melchioris, Acanthohoplites nolani (Upper Aptian); Leymeriella tardefurcata and Douvilleiceras mammillatum (Lower Albian). The recognition of these biozones allows a precise age calibration of the Maestrat Basin's lithostatigraphic units that contain ammonoids as well as an associated indirect age calibration of the formations without ammonoids. Consequently, this report provides an updated, comprehensive and precise biostratigraphic framework, which aims to become a reference for the analysis of the Lower Cretaceous strata of the Maestrat Basin. The results are also relevant for the analysis of coeval ammonite-bearing sedimentary successions found in other Tethyan basins.
Cretaceous Research, 1997
An Upper Cenomanian to Lower Turonian section has been sampled in the vicinity of Ganuza , northe... more An Upper Cenomanian to Lower Turonian section has been sampled in the vicinity of Ganuza , northern Spain. Ammonoids , inoceramids and microfossils including foraminifera and calcareous nannofossils have been studied. We recognize three planktonic foraminiferal biozones : the Rotalipora cushmani , Whiteinella archaeocretacea and Helvetoglobotruncana helvetica Zones. We also characterize the Eif fellithus turriseif felii and Quadrum gartneri Zones , based on nannofossil biostratigraphy. Macrofaunal occurrences are scarce but allow us to characterize the Metoicoceras geslinianum and Mammites nodosoides Zones , and two inoceramid assemblages. In the Rotalipora cushmani Zone the following sequence of biohorizons is recorded from bottom to top : (a) last occurrence (LO) of Corollithion kennedyi ; (b) LO of Rotalipora greenhornensis ; (c) LO of Axopodorhabdus albianus ; (d) first occurrence (FO) of Euomphaloceras septemseriatum , (e) LO of Lithraphidites acutus ; (f) LO of Rotalipora cushmani. In the Whiteinella archaeocretacea Zone the sequence of events is as follows : (g) FO of Calycoceras naviculare ; (h) LO of Microstaurus chiastius ; (i) FO of Quadrum intermedium ; (j) FO of Helvetoglobotruncana praehelvetica ; (k) FOs of Kamerunoceras sp. and Mytiloides submytiloides ; (l) FO of Mytiloides kossmati kossmati ; (m) FO of Kamerunoceras calvertense ; (n) FO of Quadrum gartneri ; (o) FO of Mammites nodosoides ; (p) FO of Mytiloides mytiloides. The top of this zone is marked by the FO of Helvetoglobotruncana helvetica. A possible Cenomanian-Turonian (C / T) boundary can be drawn between FOs of Kamerunoceras sp. and Mytiloides submytiloides and the FO of Mytiloides kossmati kossmati. Successive FOs of H. praehelvetica and Q. gartneri are also good proxies for the C / T boundary .
Guix, 2001
Acceso de usuarios registrados. Acceso de usuarios registrados Usuario Contraseña. ...
Cretaceous Research, 1997
The Campanian and Maastrichtian ammonite fauna from the Internal Prebetic (Betic Range) , Alicant... more The Campanian and Maastrichtian ammonite fauna from the Internal Prebetic (Betic Range) , Alicante province , southeast Spain , is systematically described and figured for the first time. The species identified are Brahmaites (Anabrahmaites) vishnu , Pseudokossmaticeras brandti , Pachydiscus (Pachydiscus) colligatus , P. (P .) neubergicus , P. (P .) gollevillensis and Hoplitoplacenticeras rejaudryi .
Geologica Acta. Open Journal Systems. Ajuda de la revista. Usuari/Usuària Nom d'usuari, ... more Geologica Acta. Open Journal Systems. Ajuda de la revista. Usuari/Usuària Nom d'usuari, Contrasenya, Recorda'm. ...
The basal age of the Escucha Formation of the Maestrat basin has been object of diverse age inter... more The basal age of the Escucha Formation of the Maestrat basin has been object of diverse age interpretation ranging from the Upper Aptian to the Upper Albian. In the depocentre of the Maestrat basin, in the Salzedella sub-basin, the Escucha formation presents ammonoids record in his part basal.
In order to revise the age of this formation, the ammonoids studied previously by other authors, the unpublished material from private collections, and specimens collected while the section was logged, have been studied.
The study of these ammonoids has allowed us to recognize an association with profusion of engonoceratids, Parengonoceras caneroti Collignon, together with some douvilleiceratids and hypacanthoplitids.
The biostratigraphic analysis and comparison with other similar faunas from France, England and Tunisia allow to date the assemblages to the Early Albian (Leymeriella tardefurcata Zone and probably lower part of the Douvilleiceras mammillatum Zone).
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Papers by Ricard Martinez
In order to revise the age of this formation, the ammonoids studied previously by other authors, the unpublished material from private collections, and specimens collected while the section was logged, have been studied.
The study of these ammonoids has allowed us to recognize an association with profusion of engonoceratids, Parengonoceras caneroti Collignon, together with some douvilleiceratids and hypacanthoplitids.
The biostratigraphic analysis and comparison with other similar faunas from France, England and Tunisia allow to date the assemblages to the Early Albian (Leymeriella tardefurcata Zone and probably lower part of the Douvilleiceras mammillatum Zone).
In order to revise the age of this formation, the ammonoids studied previously by other authors, the unpublished material from private collections, and specimens collected while the section was logged, have been studied.
The study of these ammonoids has allowed us to recognize an association with profusion of engonoceratids, Parengonoceras caneroti Collignon, together with some douvilleiceratids and hypacanthoplitids.
The biostratigraphic analysis and comparison with other similar faunas from France, England and Tunisia allow to date the assemblages to the Early Albian (Leymeriella tardefurcata Zone and probably lower part of the Douvilleiceras mammillatum Zone).