Federico olóriz

University of Granada | UGR · Department of Stratigraphy and Paleontology

A Hildoglochiceras -rich horizon is reported from a thin carbonate intercalation within the siliciclastic Upper Jurassic Jhuran Formation of the Jara Dome, western Kachchh Mainland. The Hildoglochiceras specimens have been used for the first population-level study of the genus based on a multivariate analysis. High phenotype instability in the larg...

Se estudia el contenido paleoicnológico reconocido en la ritmita margo-calcarea de edad Kimmeridgiense temprano-medio que aflora en el perfil de Puerto Lorente (Sª de Cazorla). Se reconocen los icnogeneros Chondrites, Planolites, Thalassinoides y parejas de orificios que se relacionan probablemente con Arenicolites. La distribución y relaciones obs...

A 410 cm thick succession of late Kimmeridgian deposits belonging to the La Caja Fm. has been analyzed in the San Matias Canyon as preliminary approach to the study of fossil concentrations in the Upper Jurassic of Mexico. Lithostratigraphic, sedimentologic, taxonomic, biostratigraphic and taphonomic observations based on a bed-by-bed sampling with...

The qualitative and quantitative investigation of non-carbonate minerals—such as clay minerals—in ancient limestones and dolostones is a widely applied tool in palaeoenvironmental analysis. In order to exploit clay minerals as palaeoenvironmental proxies, these must be extracted from their host carbonate prior to analysis. Over the last decades, ef...

Well-adapted to high-standard science at the time, Carl Burckhardt made a relevant contribution to stratigraphy in Mexico, providing the guidelines for subsequent research. A revision of his pervasive influence focuses in the interpretation of the ammonite genus Kossmatia Uhlig, with reference to Burckhardt's interpretations between 1906 and 1930,...

Shallow-platform settings with marked differences in paleoplatform bottom physiography influence the degree of connection with oceanic waters and overall circulation patterns, even when sharing the same palaeoclimatic conditions. Two Kimmeridgian shallow-marine settings have been explored to test the sensitivity and reliability of carbonate chemost...

The ammonite Hybonoticeras authariformis new species [M] is erected from the lower Tithonian of Mexico, adding a new example of endemism for the genus Hybonoticeras in records from epicontinental areas. The newly described species is the first evidence of unequivocal lowermost Tithonian macroconchiate hybonoticeratines reported from the Mexico-Cari...

The Costa Tropical in Granada Province, in Southern Spain, was intensively developed during the 1980s and 90s. A complex of several residential communities was built on the eastern slope of the coastal Cerro Gordo hill (Almuñécar), on the pre-existing Calaiza landslide. This was not identified in the preliminary technical studies, thus giving rise...

Juan Vilanova y Piera (1821-1893) fue una figura comprometida, relevante, de la Geología y Paleontología de la segunda mitad del siglo XIX en España. En sus investigaciones geológicas en la provincia de Teruel aportó información sobre los primeros ataxioceratinos ilustrados con material recolectado en España, incluyendo su clasificación. Su contrib...

New data are presented in relation to the worldwide definition of the Oxfordian/Kimmeridgian boundary, i.e. the base of the Kimmeridgian Stage. This data, mostly acquired in the past decade, supports the 2006 proposal to make the uniform boundary of the stages in the Flodigarry section at Staffin Bay on the Isle of Skye, northern Scotland. This bou...

The functional explanation of the marginal corrugation of ammonoid septa is a challenge given the lack of extant representatives and hence the impossibility of direct experimentation on them. For this reason, the lines of evidence must be based on comparisons of ammonites with other extant cephalopods. Here, we study the ontogenetic allometries of...

Common, recurrent and pervasive homeomorphism makes precise biostratigraphy crucial for correct interpretations of Lower Kimmeridgian ataxioceratin ammonites (e.g., Ataxioceras Fontannes, 1878 and Ataxioceras [Schneidia] Atrops, 1982) on the basis of analyzing complete specimens. Ataxioceras is not conclusively known even in epicontinental, Submedi...

Ataxioceratin ammonites retrieved from lower levels of the Kimmeridgian suc-cesion across central-East, NE and SE Mexico were known formerly from subsur-face, core samples and then from outcrops (Cantú-Chapa, 1969 to 2001; Villaseñor, 1991; Villaseñor et al., 2000; Villaseñor et al., 2012; and references therein). Speci-mens identified in core samp...

Chemostratigraphy applied to ancient marine carbonates commonly is based on one-dimensional (stratigraphic) sections or core data. As demonstrated from modern oceans, this approach underestimates the spatial complexity of physico-chemical seawater properties. Here, a several-hundred-kilometer long transect consisting of seven Upper Jurassic section...

Elemental concentrations in Phanerozoic seawater are known to fluctuate both in time and space. With regard to carbonates precipitated from marine fluids, elemental concentrations in the carbonate crystal lattice are affected by a complex array of equilibrium and non-equilibrium as well as post-depositional alteration processes. In order to assess...

Several new specimens of ammonites from the Oxfordian and Kimmeridgian of Kachchh, western India, are described and illustrated. The Oxfordian ammonites ?Subdiscosphinctes Malinowska, Perisphinctes Waagen, Dichotomoceras Buckman, and ?Larcheria Tintant, all from Bharodia in the Wagad Uplift, enable tentative biochronostratigraphic correlations with...

Terra Nova, 24, 437–445, 2012 AbstractThe notion that diagenetic imprint on ancient carbonates significantly compromises palaeoenvironmental interpretations is revealed as an oversimplification. The enigmatic case at the core of this research is an extended, homogeneous, macrofossil‐poor deposit showing distinctive dark brown colour and very fine g...

The reconstruction of paleoenvironmental conditions is based on the study of ancient rock materials. For this purpose, skeletal materials are often assumed to have higher preservation potential, sometimes favored over the use of matrix micrite. However, factors such as ecology, depositional setting, mineralogy and diagenetic processes may obscure o...

The analysis of macroinvertebrate and foraminiferal assemblages from Upper Jurassic (Middle Oxfordian to Lower Kimmeridgian) epicontinental shelf deposits in the Prebetic (Betic Cordillera, southern Spain) reveals the influence of environmental changes. They are expressed as selected parameters in palaeogeographic and stratigraphic trends (litho- a...

Ten years after the publication of "Recent advances in Upper Jurassic (Kimmeridgian-Tithonian) ammonite biostratigraphy of north-central Mexico, based on recently collected ammonite assemblages", a working program based on bed-by-bed sampling of upper Jurassic sections in Mexico has allowed to improve information about known and new outcrops in nor...

Three sections from the eastern Iberian Chain are compared in terms of their geochemical signature. Stable isotope (C or O) and trace elements analysis (Mg, Sr, Fe and Mn) are complemented by cathodoluminiscence inspection and overall skeletal abundance. The goal is to approach the identification of potential sources for sedimentary contribution on...

Se informa del primer registro del género Vinalesphinctes (Ammonitina) en México. Los especímenes fueron recolectados en dos secciones del Oxfordiano analizadas en el centro-este de México, región de la Huasteca, estados de Hidalgo y San Luis Potosí. Se reconocen dos morfoespecies: Vinalesphinctes tamanensis y Vinalesphinctes tenangensis. Se compar...

The precise record of simoceratins sampled bed-by-bed is first reported from Mexico (Mazatepec area in Puebla, central-eastern Mexico), as well as the existence of lappeted peristomes in these ammonites. Both Pseudovolanoceras aesinense and the subspecies Pseudovolanoceras aesinense chignahuapense are shown to occur among Mexican simoceratins. The...

The stratigraphic record of the Middle and Upper Jurassic in the Western Tethys is characterized by successive eustatic and tectonic events recorded as stratigraphic unconformities, which are revealed by hardgrounds, palaeokarsts, palaeosoils, and by the deposition of Fe–Mn crusts. The study of a Mn crust from the Middle-Upper Jurassic discontinuit...

More than two decades of improving knowledge on ataxioceratin ammonites gathered bed-by-bed from lower Kimmeridgian deposits in the eastern Iberian Chain, E–NE Spain , allow to propose a biostratigraphic chart based on their precise ranges and to evaluate its correlation potential with respect to the Secondary Standard for the Submediterranean Prov...

This study summarizes the final results of magnetostratigraphic and biostratigraphic investigations of the Tithonian/Berriasian (J/K) boundary limestones at the locality of Puerto Escaño, Spain. The aim is to prepare the background for correlation of an upper Tithonian and lower Berriasian biostratigraphic zonation with global magnetoevents (manife...

New ammonites collected bed-by-bed from the upper part of Ataxioceras hypselocyclum Chronozone deposits in the eastern Iberian Chain are described as Geyericeras gen. nov. The new genus includes micro- and macroconchiate Ataxioceratinae of small size, with moderate to loose coiling and subpolyplocoid ribs, a character crucial for its identification...

Matrix micrites are a commonly used carbonate archive for the reconstruction of past environmental parameters, but one that is submitted to known limitations. Main reasons for the often ambiguous value of many micrite-based isotope data sets are the unknown origin of the micrite components and their poorly resolved diagenetic history. Here we prese...

Ammonite biostratigraphy and its correlation potential are evaluated for Ataxioceras-bearing deposits in the eastern Iberian Range, E–NE Spain. The Chronostratigraphic Standard Hypselocyclum Zone of sub-Mediterranean areas is analysed. Correlation of the new Ataxioceras lothari Biozone is proposed utilising first appearance datum (FAD)-based biostr...

Ammonite biostratigraphy and its correlation potential are evaluated for the lower Kimmeridgian, Platynota Chronozone, in the eastern Iberian Range, E–NE Spain. The presence of the Orthosphinctes, Ardescia desmoides and Schneidia guilherandense subzones has been confirmed. Four formal ammonite “intra-subzone biodivisions” (i.e. so-called horizons o...

Three Ammonitico Rosso (AR) sections from the Betic Cordillera in SE Spain were analysed to obtain stable isotope records and access paleoenvironmental information. The study area corresponded to a Late Jurassic distal epioceanic setting and is characterized by the occurrence of more or less calcareous AR horizons ranging from greyish to redish col...

Imlay's ammonite species Paradontoceras butti and Paradontoceras antilleanum are first reported from central-east Mexico under precise stratigraphic control. Mexican and Cuban ammonites referred to these species have been studied and proved to have been gathered from a relatively limited area within the southern paleomargin of the north American Pl...

Many models that attempt to interpret the regional geology of the CaribbeanGulf of Mexico area share the handicap of paying little attention to precise data from Cuba despite its location at the North American-proto- Caribbean paleoboundary. The North American Mesozoic paleomargin crops out along northern Cuba, an area where many wells have encount...

In the vicinity of some Triassic-cored and Albian palaeohighs, small (up to 70 cm thick and a few meters in length) thrombolitic and stromatolitic microbialites have been recognized for the first time, in the upper lithological unit (Unit 3) of the Bahloul Formation of North Tunisia, near the Cenomanian-Turonian transition .. These microbialites co...

Bed–by–bed sampling of ammonites from clayey to calcareous siltstones of the basal part of the Santiago Formation at the type section in Tamán, San Luis Potosi (Mexico) is first reported. Ammonites belonging to assemblages described by Burckhardt (1912), usually interpreted as Middle to Upper Oxfordian, are restricted to the lowerMiddle Oxfordian P...

Bed-by-bed sampling of ammonites from clayey to calcareous siltstones of the basal part of the Santiago Formation at the type section in Tamán, San Luis Potosí (Mexico) is fi rst reported. Ammonites belonging to assemblages described by Burckhardt (1912), usually interpreted as Middle to Upper Oxfordian, are restricted to the lower Middle Oxfordian...

Benthic foraminiferal assemblages belonging to a mixed carbonate–siliciclastic shelf succession of the Oxfordian (Upper Jurassic) in the Prebetic, southern Spain, were analyzed. The faunal data, obtained on thin sections of strongly lithified sediments, allowed the detailed differentiation of a foraminiferal morphogroups system to be applied to the...

Composition and taphonomy of macro-invertebrate fossil assemblages, together with facies analysis, have been approached in order to interpret shifting paleoenvironmental conditions in the External Prebetic (S-SE Spain) during the early Late Jurassic (Middle Oxfordian). In oolitic and spongiolitic limestones, the size of fossil remains, mode of pres...

Foraminiferal assemblages from the neritic environment reveal the palaeoecological impact of nutrient types in relation to shore distance and sedimentary setting. Comparatively proximal siliciclastic settings from the Boreal Domain (Brora section, Eastern Scotland) were dominated by inner-shelf primary production in the water column or in sea botto...

Lower Kimmeridgian to Lower Tithonian (Upper Jurassic) sections studied at Sierra de Palotes (Durango) and Sierra de Catorce (San Luis Potosí), Mexico, show low-energy deposits in which the composition of fossil macroinvertebrate assemblages, including megabenthos, reflects biostratinomic control. Monotonous siltstones provide continuous records of...

The widespread assumption that sutural complexity in ammonites is mainly proportional to water depth is revisited. Fractal analysis has been used for the precise morphometric evaluation of sutural complexity in 131 Upper Jurassic ammonites. Suture lines belonging to twelve families have been analyzed, account being taken of shell structure (coiling...

The evolution of intricate septa and complex sutural patterns in cephalopod ammonoids is one of the best documented trends in the fossil record towards increased levels of complexity. Functional interpretation of septal folding is still, however, a matter of controversy. Tentative explanations have been linked to the structural reinforcement of phr...

The palaeoenvironmental conditions and trophic structure of a mid-outer neritic biota (microfossils, mainly forams, and macroinvertebrate assemblages) have been approached in middle Oxfordian–lowermost Kimmeridgian deposits from the Prebetic Zone (Betic Cordillera) in south-eastern Spain. According to relationships between fossil assemblages and li...

Two rare ammonite species are recorded and illustrated for the first time from the Tithonian of Tunisia: Simocosmoceras cf. adversum (OPPEL) and Micra- canthoceras (Corongoceras) symbolurn carthaginoustensis n. subsp. These records are interpreted in the ecological context of metapopulation dynamics. Zusammenfassung: Zwei seltene Ammonitenarten wer...

Two specimens of Ceratosphinctes represent the first record of this taxon in Mexico (Mexican Huasteca), and are interpreted as Ceratosphinctes rachistrophus amatitlaensis nov. subsp. The subspecies level is used with biogeographic significance, most probably indicating incoming propagules and adaptation to local environmental requirements. Biostrat...

The genus Vinalesphinctes (Ammonitina) is reported for the first time from Mexico. The studied specimens were collected from two Oxfordian sections of the east-central Mexico, Huasteca region, Hidalgo and San Luis Potosi states. Two morphospecies have been identified, Vinalesphinctes tamanensis and Vinalesphinctes tenangensis. Mexican, Cuban and Ch...

In the context of updating biostratigraphic analysis in the Upper Kimmeridgian-lowermost Berriasian from the whole of the Tunisian Dorsale (NE Tunisia), new results obtained from the Jebel Oust reference section are presented. The bed-by-bed-sampling of a rather rich ammonite fauna gathered in the two most favourable profiles in the area allowed to...

Two main types of microbial encrustation were identified in Middle Oxfordian to lowermost Kimmeridgian deposits in the Prebetic Zone (southern Spain), showing existing relationships between skeletal content, fabric and morphology of these organosedimentary structures. Laminated planar and concentric encrustations relate to peloidal fabrics (mainly...

Microboring was investigated through thin section analysis of Oxfordian rocks from the Prebetic Zone (Betic Cordillera, southern Spain). Microboring description and distribution were analysed, as was their correlation with traits such as the type and size of bioclasts and microtaphonomic features (encrustation and fragmentation). Single and branchi...

The taphonomic analysis conducted on ammonoid assemblages has proven useful for palaeobiological and palaeoenvirommental reconstructions in upper Middle-to-lower Upper Oxfordian epicontinental deposits of the Internal Prebetic (southern Spain). Taphonic populations close to type I indicate the proximity, even coincidence, of life areas for neritic...

This paper deals with a definition of the lower boundary stratotype of the Tithonian Stage in the Upper Jurassic succession of Monte Inici, Western Sicily. The upper member of the Rosso Ammonitico Fm. is 27 m thick and shows a typical nodular-calcareous lithofacies; its lower beds have been sampled for biostratigraphic and paleomagnetic purposes. T...

Two nuclei of Gregoryceras are described as the first record of the genus in Mexico. The occurrence in Mexico of the ubiquitous Tethyan genus Gregoryceras is interpreted as related to a major flooding episode that affected neritic shelves in the southern North-American plate.

During the Middle to Late Oxfordian (locally ranging into the earliest Kimmeridgian), the epicontinental shelf that persisted in the southeastern paleomargin of Iberia (Prebetic Zone) was largely colonized by siliceous sponges (Dictyida, Lychniskida, and Lithistida, in descending order of abundance). Spongiolithic lithofacies (sponge-rich deposits...

Middle-Upper Oxfordian assemblages of foraminifera in the Prebetic Zone (Betic Cordillera, SE Spain) were analysed at the genus level to determine their composition, relative abundance, diversity, and dominance, as well as the size of the specimens. A relationship has been established between lithofacies, palaeogeography and composition of foramini...

The stratigraphic and geodynamic interpretation of Upper Jurassic lithostratigraphic units is revised in north-central Mexico and the northern rim of the Gulf of Mexico Basin through updated ammonite and calpionellid biochronostratigraphy. Significant events in the geodynamic evolution in these areas are evaluated and interpreted in terms of tecton...

The occurrence of Simocosmoceras in Mexico is first reported from the Mazatepec area (Puebla) in East-central Mexico. Simocosmoceras pszczolkowskii apulcoensis n. subsp. shows closest morphological resemblance with Simocosmoceras pszczolkowskii Myczynski registered in western Cuba (Myczynski 1989). Ecological adaptation to comparatively epeiric sea...

In a fine-grained Lower to Middle Kimmeridgian marly limestone rhythmite succession, with scarce benthos, fluctuations in ecological and depositional conditions that affected the substrate are detected by analysing trace-fossil assemblages. The dominant grey mudstones with Chondrites and Planolites superimposed on lumpy matrix sediments indicate bo...

The study of six sections within the External Prebetic (Pozo Cañada, Fuente Álamo, Chinchilla de Montearagón and Riogazas-Chorro II) and the Internal Prebetic (Navalperal and Rı́o Segura), comprises the first results of a taphonomic study to be incorporated into the ecostratigraphic interpretation of the Oxfordian in the Prebetic Zone, Betic Cordil...

The functional significance of frilled septa and complex sutures in ammonoids has generated ongoing debate. The ‘classic’ hypothesis envisages ammonoid shells and septa as designed for resisting ambient hydrostatic pressure, complex sutures being the evidence of strength in shells for colonization of deep habitats. Here we address the ‘suture probl...

The study of septal patterns in ammonoids has been centered on functional and/or constructional issues. Complexly fluted septa have been considered as complementary structures that reinforce the ammonite shell, their frilled sutures possibly manifesting the demand for strength. Ammonitic sutures display features that denote typical fractal behavior...

At the beginning of the Jurassic period, southern European areas formed a single continental mass open to the east (western Tethys), and the Iberian plate lay between latitude 25ºN and 35°N. It was separated from the larger European plate to the north by a narrow trough corresponding to the early rifting of the Bay of Biscay. To the NW it was separ...

Flat-pebble conglomerates have been identified in the Lower Toarcian (Levisoni Zone) carbonates of the Sesimbra region (30 km south of Lisboa, Portugal) and related to submarine mass movements. Their origin is explained through a three-stage model based on the comparative analysis of potential generating mechanisms taking into account timing and ty...

The present research approaches the precise palaeoecologic interpretation based on the recognition of 12 ‘autochthonous’ bivalve assemblages among 52 registered from the Upper Jurassic–Lowermost Cretaceous La Caja Formation in the Cañón de San Matías section (Mexican Altiplano). Fine-grained deposits together with the near-exclusive record of suspe...

A combined multidisciplinary approach has been applied to calculate minimum values of the stratigraphic completeness and, secondarily, sedimentation rates in 9.2 m thick Rosso Ammonitico facies from central Apennines (Italy) and 11 m thick deposits of the same facies in Southern Spain. Middle - Upper Toarcian expanded sedimentation in Valdorbia sec...

Diplocraterion parallelum with exclusively protrusive spreite are documented at particular horizons in fine-grained Lower Kimmeridgian (Upper Jurassic) deposits from the Prebetic Zone (Betic Cordillera, southern Spain). The occurrence of D. parallelum and the interpreted change from a Cruziana ichnofacies to a mixed Skolithos-Cruziana assemblage is...

Hybonoticeras mundulum (Oppel) (m) s.s. is reported from the Mexican Altiplano on the basis of material collected bed-by-bed in sections in the States of Durango and Zacatecas. The known range of this species in the Mexican Altiplano is interpreted to be uppermost Kimmeridgian (upper to uppermost Beckeri Zone) to lowermost Tithonian (basal to lower...

Time-averaging and stratigraphiC completeness combine with information inherent to fossil preservation and point to the availability of long- rather than short-term palaeoecology, especially in old-fossil assemblages as those bearing ammonites. On this assumption, traditional topics such as interpretations of ammonite biogeography should be revisit...

A diversified and previously unknown record of microconchiate Hybonoticeras is analysed on the basisof the material collected in sections sampled bed-by-bed in the Mexican Altiplano. Five new species are described and compared to species traditionally recorded from the uppermost Kimmeridgian and the lowermost Tithonian in Europe. A general trend to...

The Kimmeridgian-Tithonian boundary in the Sierra Norte of Mallorca is revisited on the basis of preciseammonite biostratigraphy. According to eight ammonite assemblages identified, depositional conditions suddenly changed from ammonitico rosso to ammonite-poor brownish mudstones during a short time interval close to the Kimmeridgian-Tithonian boun...

The precise analysis of ammonite ranges in the Kimmeridgian section at Gallipuén permits the recognition of the Platynota, Hypselocyclum and Divisum Zones of the Lower Kimmeridgian, but the presence of the lowermost Upper Kimmeridgian in the area is doubtful. From bottom to top, Ihe Platynota Zone is subdivided in the "Orthosphinctes interval", the...

The biostratigraphic analysis of the Rio Gazas-Chorro II profile in the Sierra de Cazorla (Prebetic Zone, southern Spain) has enabled the first detailed biochronostratigraphic characterisation in the area for the Bifurcatus and Bimammatum Zones (Upper Oxfordian), and part of the Planula Zone (uppermost Oxfordian or lowermost Kimmeridgian). In addit...

Ammonite stratigraphy of the Upper Jurassic-lowermost Cretaceous La Caja Formation is analyzed in two sections near Rancho Los Alamitos in the Sierra de Catorce, San Luis Potosi, Mexico. Numerous ammonites and other megainvertebrates, mainly bivalves, were collected bed by bed and complemented with data on rare calpionellids. The data obtained on a...

We report recent advances concerning a research programme focused on the characterization of suture complexity in ammonoids using the method of fractal analysis (stepline procedure), as well as the covariation between suture complexity, shell geometry and sculpture, paying attention to assumed major environments colonized by Late Jurassic ammonites...