Late Cretaceous marine transgressions in Ecuador and northern Peru: a refined stratigraphic framework.

Study of ammonites and bivalves along selected sections on the Andean margin of northern Peru and Ecuador has made it possible to recognize correlatable marine transgressions and to propose a refined stratigraphic framework for the Upper Cretaceous of the region. Six maximum flooding events are recognized: latest Turonian–early Coniacian (major event), late Coniacian–early Santonian, late Santonian–early Campanian, mid Campanian–early late Campanian (major event), early Maastrichtian (major event), and terminal early Maastrichtian. Most of these events can be correlated with global eustatic sea-level rises, but their relative manifestations indicate that the Andean margin was already being deformed by the late Cretaceous “Peruvian” tectonic events. The onset of fine-grained clastic sedimentation in the Oriente and East-Peruvian basins in the mid Turonian–earliest Coniacian is taken as the first event of the “Peruvian” phase. The Campanian regional transgression in the Peruvian-Ecuadorian forearc zones concealed the “Peruvian” deformational event. The latter caused a palaeogeographic upheaval, indicated by the subsequent development of a NNE-trending forearc basin, which extended from Paita in northwestern Peru to northern Ecuador. In the forearc zones only short-lived transgressions are recorded in the late Campanian and early Maastrichtian as a result of nearly continuous tectonic activity. This culminated with a significant tectonic event in the late Maastrichtian, causing a widespread hiatus

THE APTIAN STRATIGRAPHY OF SOUTHERN TUARKYR (NW TURKMENISTAN, CENTRAL ASIA)

The ammonite successions of Turkmenistan, particularly those of the Greater Balkhan and Tuarkyr areas, are considered references for the Aptian Stage. Six sections across the uppermost Barremian - basal Upper Aptian interval were studied in the Tuarkyr desert in October 1997,and ammonites and bivalves were collected. Data are compared with those from a section sampled by a Russian team in 1959. The stratigraphic distribution of the faunas in the sections is discontinuous, as the fossiliferous levels intercalate with terrigenous sediments. The ammonite faunas, at least in the intervals sampled, show low diversity and are dominated by the genus Deshayesites in the lower Aptian and the genus Epicheloniceras, associated with the less common Caspianites, in the basal upper Aptian. The Turkmenistan sections contain species present also in the Caucasus, England, Germany, France and Switzerland, indicating that the Turkmenian faunas reflect impoverishement rather than geographic isolation. The chronologic equivalence between the Turkmenian Epicheloniceras subnodosocostatum Zone and the Epicheloniceras martinioides Zone in England seems questionable because the Epicheloniceras-bearing beds of the Tuarkyr correspond to the upper part of the E. martinioides Zone, i. e. the Epicheloniceras buxtorfi Subzone. The bivalve fauna consists mainly of pteriids, Exogyrinae oysters and trigoniids. These groups undoubtedly indicate a very shallow, fairly warm and fully marine environment, typical of the Tethyan Lower Cretaceous. The heterodonts are too rare to give further bathymetric indications. None of the taxa indicate deep burrowing and all are assumed to be ?? littoral. The bivalve fauna shows strong affinities with that of the English Lower Greensand.&nbsp

Sedimentary record of terminal Cretaceous accretions in Ecuador: the Yunguilla Group in the Cuenca area

15 pages Sous presse dans le: "Journal of South American Earth Sciences"A reappraisal of the “Late Cretaceous Yunguilla Formation” of the Cuenca area made it possible to define four distinct formations, correlatable with those of southwestern Ecuador. A mid to late Campanian marine transgression (Jadán Fm) is overlain by quartz-rich conglomerates of fan-delta to turbiditic fan environment (Quimas Fm) of latest Campanian-earliest Maastrichtian age, which are interpreted as evidence of the accretion of a first oceanic terrane (San Juan). Disconformable, arkosic turbidites and cherts (Tabacay Fm) of early Maastrichtian age are thought to represent the erosion of the newly accreted oceanic terrane. A major unconformity of late Maastrichtian age, caused by the accretion of a second oceanic terrane (Guaranda), is followed by the deposition of quartz-rich micaceous shelf sandstones (Saquisilí Fm) of Paleocene age. A third accretion event (late Paleocene) is recorded in coastal Ecuador. Each accretion event correlates with the uplift and erosion of the Eastern Cordillera, and with a sedimentary hiatus in the eastern areas. This suggests that in Ecuador, accretion of oceanic terranes contributed to the build-up of the Andes through tectonic underplating of low-density material, and that the eastern areas did not behave as a flexural foreland basins during late Cretaceous-Paleogene times

Minimal information for studies of extracellular vesicles 2018 (MISEV2018):a position statement of the International Society for Extracellular Vesicles and update of the MISEV2014 guidelines

The last decade has seen a sharp increase in the number of scientific publications describing physiological and pathological functions of extracellular vesicles (EVs), a collective term covering various subtypes of cell-released, membranous structures, called exosomes, microvesicles, microparticles, ectosomes, oncosomes, apoptotic bodies, and many other names. However, specific issues arise when working with these entities, whose size and amount often make them difficult to obtain as relatively pure preparations, and to characterize properly. The International Society for Extracellular Vesicles (ISEV) proposed Minimal Information for Studies of Extracellular Vesicles (“MISEV”) guidelines for the field in 2014. We now update these “MISEV2014” guidelines based on evolution of the collective knowledge in the last four years. An important point to consider is that ascribing a specific function to EVs in general, or to subtypes of EVs, requires reporting of specific information beyond mere description of function in a crude, potentially contaminated, and heterogeneous preparation. For example, claims that exosomes are endowed with exquisite and specific activities remain difficult to support experimentally, given our still limited knowledge of their specific molecular machineries of biogenesis and release, as compared with other biophysically similar EVs. The MISEV2018 guidelines include tables and outlines of suggested protocols and steps to follow to document specific EV-associated functional activities. Finally, a checklist is provided with summaries of key points

Minimal information for studies of extracellular vesicles (MISEV2023): From basic to advanced approaches

Extracellular vesicles (EVs), through their complex cargo, can reflect the state of their cell of origin and change the functions and phenotypes of other cells. These features indicate strong biomarker and therapeutic potential and have generated broad interest, as evidenced by the steady year-on-year increase in the numbers of scientific publications about EVs. Important advances have been made in EV metrology and in understanding and applying EV biology. However, hurdles remain to realising the potential of EVs in domains ranging from basic biology to clinical applications due to challenges in EV nomenclature, separation from non-vesicular extracellular particles, characterisation and functional studies. To address the challenges and opportunities in this rapidly evolving field, the International Society for Extracellular Vesicles (ISEV) updates its 'Minimal Information for Studies of Extracellular Vesicles', which was first published in 2014 and then in 2018 as MISEV2014 and MISEV2018, respectively. The goal of the current document, MISEV2023, is to provide researchers with an updated snapshot of available approaches and their advantages and limitations for production, separation and characterisation of EVs from multiple sources, including cell culture, body fluids and solid tissues. In addition to presenting the latest state of the art in basic principles of EV research, this document also covers advanced techniques and approaches that are currently expanding the boundaries of the field. MISEV2023 also includes new sections on EV release and uptake and a brief discussion of in vivo approaches to study EVs. Compiling feedback from ISEV expert task forces and more than 1000 researchers, this document conveys the current state of EV research to facilitate robust scientific discoveries and move the field forward even more rapidly

Campanian and Maastrichtian Inoceramids: A review

Volume: 10Start Page: 689End Page: 70

Troubles musculosquelettiques et lombalgies chez le personnel soignant du CHRU de Lille (enquête de prévalence)

LILLE2-BU Santé-Recherche (593502101) / SudocPARIS-BIUM (751062103) / SudocSudocFranceF

Stratigraphie et évolution du bassin d'avant-arc de Celica-Lancones du Sud-Ouest de l'Equateur

International audienceThe "Celica-Lancones" forearc Basin of southern Ecuador and northern Peru is located between the Paleozoic Amotape-Tahuin Massif to the west and NW and the continental volcanic arc to the east and SE. The study of nine sections and exhaustive sampling of the poorly fossiliferous, mainly clastic Cretaceous deposits of this Basin allowed us to define five distinct series, which display two depositional periods.The first period corresponds to the development of an Early (?) and Middle Albian carbonate shelf, interrupted during Late Albian times by the creation of a tectonically generated trough filled by turbidites of Late Albian-Coniacian age. Geological mapping indicates that this “Celica-Lancones Basin s.s.” includes distinct tectonic units, characterized by distinct early Late Cretaceous stratigraphic series and separated by major faults. These units can be grouped into two main paleogeographic domains. The southeastern one comprises mainly volcaniclastic deposits, whereas the northwestern domain exhibits quartz-rich deposits.Between Early Coniacian and Middle Campanian times, the “Celica-Lancones Basin s.s.” forerarc trough was deformed and eroded as a result of the Late Cretaceous “Peruvian” tectonic phase. The second period corresponds to the latest Cretaceous, during which a new forearc basin was created (Paita-Yunguilla Basin), which is much wider and strikes obliquely with respect to the Celica-Lancones Basin. The sediments of the Paita-Yunguilla Basin exhibit a comparable succession of Campanian-Maastrichtian age throughout the area and conceal the tectonic juxtaposition of the early Late Cretaceous tectonic units. The occurrence of thick Early(?) Maastrichtian coarse-grained conglomerates and breccias express a new significant tectonic event.Le Bassin d'avant-arc de Celica-Lancones du Sud-Ouest de l'Equateur et Nord-Ouest du Pérou est situé entre le Massif paléozoïque de Amotape-Tahuin à l'Ouest et l'arc volcanique continental crétacé à l'Est et au Sud-Est. L'étude de 9 coupes et l'échantillonnage systématique des dépôts clastiques peu fossilifères crétacés de ce bassin a permis de définir 5 unités, qui correspondent à différentes périodes de dépôt.La première période correspond au développement d'une plateforme carbonatée d'âge Albien inférieur(?) à moyen, interrompu à l'Albien supérieur par la création tectonique d'un bassin rempli de turbidites d'âge Albien supérieur à Coniacien. La cartographie indique que ce "Bassin de Celica-Lancones s.s." comprend plusieurs unités tectoniques caractérisées par des séries crétacé supérieur différentes séparées par de failles importantes. Le secteur sud-est comprend principalement des dépôts volcano-clastiques, alors que le secteur nord-ouest montre des dépôts riches en quartz.Entre le Coniacien inférieur et le Campanien moyen, le "Bassin de Celica-Lancones s.s." d'avant-arc est déformé et érodé par le "phase tectonique péruvienne" d'âge Crétacé supérieur. La seconde période correspond au Crétacé terminal, quand un nouveau bassin d'avant-arc est créé, le Bassin de Paita-Yunguilla, beaucoup plus large et oblique que le Bassin de Celica-Lancones. Les sédiments du Bassin de Paita-Yunguilla présentent une succession comparable d'âge Campanien-Maastrichtien sur tout le bassin, et scellent la juxtaposition tectonique des séries antérieures. La présence d'épais dépôts conglomératiques ou bréchqiues d'âge Maastrichtien (inférieur ?) indique un nouvel événement tectonique

Design drawing as a work in itself

O design sempre requer desenhos para produção de qualquer objeto. Finalizado o processo de projeto e produção, aparentemente os desenhos esgotariam suas funções. No entanto, alguns desenhos de design são elevados a categorias originalmente não previstas e afastadas da produção industrial. Uma dessas categorias é o desenho como obra com valor em si, em moldes semelhantes a uma obra de arte. Não é de hoje que os desenhos de arquitetura e design têm essas características, ligadas não apenas ao processo produtivo, mas também a questões museológicas e ao comércio de bens culturais, sendo exibidos em museus e comercializados em galerias de arte e casas de leilão, principalmente na Europa, Estados Unidos e alguns países asiáticos. Este ensaio discute as peculiaridades dos desenhos de design, investigando os diferentes contextos que eventualmente tornam esse tipo de desenho uma obra com valor em si.Design always requires drawings to production, manufacturing and assembly. Essential to best practices in all areas of design, apparently drawings would exhaust its functions at the end of the productive process. However, some drawings being raised to categories not originally foreseen and away from industrial production. One of these categories is drawings as a work in itself, as artwork. It is not from today that design and architecture drawings have these characteristics, linked not only to the productive process, but to museological issues and trade of cultural goods, being exhibited in museums and marketed in art galleries and auction houses, especially in Europe, North America and some Asian countries. This article discusses the peculiarities of design drawings, investigating the different contexts that eventually make this type of drawing a work in itself