4,190 research outputs found
Australian Aboriginal children at a government institution near Alice Springs, 1934 [transparency] /
No full textTitle devised by cataloguer based on inscription on slide.; Part of the collection: Norman Ellison collection of lantern slides.; Inscriptions: "Half casts at Govt. Hostel, near Alice Springs, 1934, M.R."--In pencil above and below image.; Condition: Cracked.; Also available in electronic version via the Internet at: http://nla.gov.au/nla.pic-vn4981428
Miss Jean Watts running on Bondi Beach with a dog, New South Wales, 1925 [transparency] /
No full textTitle devised by cataloguer based on inscription on slide.; Part of the collection: Norman Ellison collection of lantern slides.; Inscriptions: "Miss Watts, Bondi. M.R. Sydney Sept 1925"--In pencil above and below image.; Also available in electronic version via the Internet at: http://nla.gov.au/nla.pic-vn4981298
Mesozoic climates and oceans – a tribute to Hugh Jenkyns and Helmut Weissert
No full textThis is the author accepted manuscript. The final version is available from Wiley via the DOI in this record.The study of past greenhouse climate intervals in Earth history, such as the Mesozoic, is an important, relevant and dynamic area of research for many sedimentary geologists, geochemists, palaeontologists and climate modellers. The Mesozoic sedimentary record provides key insights into the mechanics of how the Earth system works under warmer conditions, providing examples of natural climate change and perturbations to ocean chemistry, including anoxia, that are of societal relevance for understanding and contextualizing ongoing and future environmental problems. Furthermore, the deposition of widespread organic-carbon-rich sediments (‘black shales’) during the Mesozoic means that this is an era of considerable economic interest. In July 2015, an international group of geoscientists attended a workshop in Ascona, Switzerland, to discuss all aspects of the Mesozoic world and to celebrate the four-decade-long contributions made by Hugh Jenkyns (University of Oxford) and Helmut Weissert (ETH Zürich) to our understanding of this fascinating era in Earth history. This volume of Sedimentology arose from that meeting and contains papers inspired by (and co-authored by!) Hugh and Helmi. Here, a brief introduction to the volume is provided that reviews aspects of Hugh and Helmi's major achievements; contextualizes the papers of the Thematic Issue; and discusses some of the outstanding questions and areas for future research
Progress in the accuracy and resolution of the Late Cretaceous Planktonic Foraminiferal Biozonation: diversification of Dicarinella and Marginotruncana and biostratigraphic implications.
No full textA recurrent feature in the evolutionary history of the planktonic foraminifera is the modification from unkeeled and globigeriniform ancestors to keeled and globorotaliform descendants. Single-keeled trochospiral taxa first appear in the Albian and correspond to a pronounced species diversification associated with an increasing degree of calcification and test size. The acquirement of peripheral double-keels is an evolutionary novelty first observed in the uppermost Cenomanian-lower Turonian assemblages.
Double-keeled specimens are traditionally included in the genus Dicarinella if all the umbilical sutures are radial and depressed, whereas those forms with raised and sigmoidal to curved umbilical sutures have been included in Marginotruncana. After the extinction of the single-keeled rotaliporids close to the Cenomanian/Turonian boundary, the recovery of keeled planktonic foraminifera was relatively slow in the basal Turonian and then progressively accelerated. This diversification is well documented by the appearance of several species of Dicarinella and Marginotruncana that dominate the Turonian-Santonian assemblages.
Superimposed on this evolutionary trend are occurrences of common transitional forms yielding morphological features in between Dicarinella and Marginotruncana (i.e., umbilical sutures initially raised then depressed and/or initially radial then curved, and combined patterns of the sutures), so that some of the diagnostic characters currently used to discriminate genera appear inadequate.
In an effort to determine the ancestor-descendant relationships among species of Dicarinella, Marginotruncana and taxa possessing intermediate morphological features, the well preserved and highly diversified planktonic foraminiferal assemblages recovered at Tanzania Drilling Project (TDP) Sites 31 and 39 (coastal Tanzania; see Jiménez Berrocoso et al., 2012) and at Ocean Drilling Program (ODP) Sites 762 and 763 (Exmouth Plateau; see Petrizzo et al., 2011) have been studied.
The morphological features displayed by the Turonian to Santonian keeled taxa have been analyzed for reconstructing lineages of descendants based on stratophenetic observations.
Results confirm that some of the keeled taxa assigned to Dicarinella and Marginotruncana derive from different ancestral species (i.e., Gonzalez Donoso and Linares in Robaszynski et al., 1990). Moreover, our findings and observations are used to revise the current classification scheme, to derive a more accurate sequence of bioevents that appear to be promising for regional and global correlations, and for refinement of the planktonic foraminiferal biozonation.
References
Jiménez Berrocoso A., Huber B.T., MacLeod K.G., Petrizzo M.R., Jacqueline A. Lees J.A., Ines Wendler I., Helen Coxall H., Mweneinda A. K., Falzoni F., Birch H., Singano J.M., Haynes S., Cotton L., Wendler J., Bown P.R., Robinson S.A., Gould J. (2012). Lithostratigraphy, biostratigraphy and chemostratigraphy of Upper Cretaceous and Paleogene sediments from southern Tanzania: Tanzania Drilling Project Sites 27 to 35. Journal of African Earth Sciences, v. 70, p. 36-57
Petrizzo, M.R., Falzoni, F., and Premoli Silva, I. (2011). Identification of the base of the lower-to-middle Campanian Globotruncana ventricosa Zone: Comments on reliability and global correlations. Cretaceous Research, 32, 387-405.
Robaszynski F., Caron M., Dupuis C., Amedro F., Gonzalez Donoso J-M., Linares D., Hardenbol J., Gartner S., Calandra F., Deloffre R. (1990). A tentative integrated stratigraphy in the Turonian of central Tunisia: formations, zones and sequential stratigraphy in the Kalaat Senan area. Bulletin Centres Recherches Exploration-Production Elf Aquitaine 14, 213–384
Esperienza ed evento della verità. Pratica filosofica e astrazione scientifica nel pensiero di A.N. Whitehead
No full textThis article analyzes the relationship between philosophy, experience and event in A.N. Whitehead’s thought. From the critics of the concept of object, the author retraces and describes the peculiar “abstract-concrete dialectic”, at the center of the researches concerning the perceptual experience.
Furthermore, according to Whitehead’s later works, she demonstrates how the philosophical practice is different from all other kinds of science, although it requires science itself because of the co-implication of object and event, abstraction and recognition
Il "Guerrin Meschino" di Gesualdo Bufalino : un'"opra" in versi
No full textGesualdo Bufalino first published Il Guerrin Meschino in 1991 in a non-commercial edition. In 1993, after a deep revision, he re-published his work with publisher Bompiani: the novel has a modified plot, and the author decided to insert three new poems in addition to the opening and closing poems, formerly present in 1991’s edition. This paper, in its entirety supported by handwritten material preserved at Fondazione Gesualdo Bufalino (Comiso), is divided in two parts: the first part illustrates the differences between the first and the second edition, the second part provides a critical edition of the five poems
A FEW WORDS ABOUT THE TEACHER. IN MEMORY OF THE EXCELLENT TEACHER AND SCIENTIST M.R. SAPIN
No full textM.R. Sapin (1925–2015) was a professor at I.M. Sechenov First Moscow State Medical University, honorary academician of Russian academy of medical sciences (1988), and an outstanding representative of the Moscow anatomical school of the middle of XX – early XXI century. From the very beginning of his medical training, Mikhail Romanovich got interested in anatomy, especially in angiology and lymphology, and later concentrated on its studying. The author of more than 30 text books and guidelines for schools, universities, and colleges, Mikhail Romanovich was the doctoral and thesis advisor of 51 Ph.D. and approximately 70 MD dissertations. M.R. Sapin made a significant contribution to the development of anatomical education providing the departments with a various range of dry and wet specimens. His stunning and effective work as a tutor was highly appreciated by his students and colleagues, Russian and foreign anatomists. M.R. Sapin was the leader of the Laboratory of Functional Anatomy since 1972, president of the International Association of Morphologists (1992–2006), chairman of the expert commission of Higher Attestation Commission (1959–1994), etc. A man of a great willpower, M.R. Sapin faced a lot of obstacles in his life and research work but overcame that all successfully. The article presents the most important facts of anatomist’s career and lifetime.</jats:p
Verslag van het voorgevallene tijdens het hooge opperwater op de Nederlandsche rivieren in den winter van 1919 op 1920
No full textNadat de Rijn op 20 December 1919 tot even beneden den middelbaren zomerstand 1901-1910 (M.R.) was gedaald vertoonde zich op die rivier een sterke en vrij snelle was, waardoor het water te Keulen tot 6m +M.R. bij het einde van het jaar steeg. In de daarop volgende 11 dagen daalde de waterstand tot 1.5m +M.R. om daarna in 5 dagen weder te rijzen tot den zeer hoogen stand van 7m +M.R. Door een aanvankelijk sterken later flauweren val liep de stand weder terug tot 1.5m +M.R. op 30 Januari. Ook op de Maas vertoonden zich twee dicht op elkaar volgende sterke wassen. Bij den aanvang van den eersten was op 19 december stond het water te Maastricht op ruim 1m +M.R. en steeg het in 6 dagen tot 4.37m +M.R.; in de daaropvolgende 9 dagen bleef de stand steeds hoger dan 4m +M.R. en daalde toen tot ongeveer 2m +M.R. op 10 Januari 1920. De tweede was trad op laatsgenoemde datum in waarbij het water oplied tot 4.94m +M.R. op 15 Januari. Het water daalde daarna dadelijk en was op 29 Januari tot ongeveer 2m +M.R. weggevallen. Bij den tweeden was op Rijn en Maas werden de hoogst bekende waterstanden bij open rivieren overtroffen te Keulen met 7 cm en te Maastricht met 2 cm. De rivieren waren ijsvrij.Hoogwaterversla
M.r Montaubry, rôle de Robinson, dans Robinson Crusoé, Théâtre de l'Opéra Comique / P. R. [sig.]
No full textSantonian–Campanian (Late Cretaceous) planktonic foraminiferal turnover, depth ecology and paleoceanographic implications
No full textThe Santonian–Campanian time interval is a transitional phase from the extreme greenhouse warmth during the Turonian to more temperate conditions and to a thermohaline circulation that was more like that of the modern day. These environmental changes led to a re-organization of marine ecosystems in deep-sea and superficial settings and to the formation of well-developed faunal bioprovinces that were analogous to the present. This environmental instability likely led to a major faunal turnover among planktonic foraminifera including extinction of the genera Marginotruncana and Dicarinella and diversification within the genera Globotruncana, Globotruncanita and Contusotruncana (Premoli Silva and Sliter, 1999).
Relatively few studies on the composition of Santonian-Campanian planktonic foraminiferal assemblages are available in the literature, and those have never been coupled with reliable species-specific stable isotope (δ13C and δ18O) analyses, mainly because: (1) DSDP (Deep See Drilling Project), ODP (Ocean Drilling Program) and IODP (Integrated Ocean Drilling Program) cruises recovered relatively few and discontinuous stratigraphic sequences belonging to this interval, and (2) planktonic foraminifera from deep-sea sites are often diagenetically altered and do not yield reliable isotopic records of paleoenvironmental condtions.
The unusual recovery of pristinely preserved planktonic foraminifera from Santonian–Campanian sequences in southeastern Tanzania (Tanzania Drilling Project, TDP Sites 28 and 32, see Jiménez Berrocoso et al., 2012), allowed examination of faunal changes and well resolved, species-specific stable isotope (δ13C and δ18O) data. These data are ideal for inferring paleoecological preferences of different species and for tracing major paleoceanographic changes. Results obtained from TDP material have been compared with δ13C and δ18O values inferred from specimens recovered at two low-to-mid latitude sites (1) Shatsky Rise (ODP Leg 198, Hole 1210B; northwestern Pacific Ocean) and (2) Exmouth Plateau (ODP Leg 122, Hole 762C; eastern Indian Ocean) to detect possible shifts in species habitat preferences in different paleoceanographic contexts.
At all the examined localities, we recognize consistent changes in the composition of planktonic foraminiferal assemblages that enable subdivision of the stratigraphic records into faunal intervals, each one characterized by a distinctive taxonomic composition. With the exception of the extinction of the typical Santonian fauna (marginotruncanids, dicarinellids), most of the observed compositional changes did not occur synchronously among sites, suggesting that changes were likely driven by local rather than global forces.
The stable isotopic results suggest consistent depth stratification and other paleoecological differences among species. In agreement with other recent studies, our results show that the depth-distribution models based on shell morphology and analogies with modern taxa are not applicable for Cretaceous planktonic foraminifera. Combined geochemical and paleontological observations suggest that during the late Campanian the water column in Tanzania was well stratified with a deep thermocline and a thick mixed layer whereas less stratified and/or mesotrophic conditions prevailed at least in some intervals at Shatsky Rise and Exmouth Plateau.
References
Jiménez Berrocoso A., Huber B.T., MacLeod K.G., Petrizzo M.R., Jacqueline A. Lees J.A., Ines Wendler I., Helen Coxall H., Mweneinda A. K., Falzoni F., Birch H., Singano J.M., Haynes S., Cotton L., Wendler J., Bown P.R., Robinson S.A., Gould J. (2012). Lithostratigraphy, biostratigraphy and chemostratigraphy of Upper Cretaceous and Paleogene sediments from southern Tanzania: Tanzania Drilling Project Sites 27 to 35. Journal of African Earth Sciences, v. 70, p. 36-57
Premoli Silva and Sliter, 1999. Cretaceous paleoceanography: evidence from planktonic foraminiferal evolution. In E. Barrera, and C. C. Johnson, eds. The Evolution of the Cretaceous Ocean-Climate System. Special Paper of the Geological Society of America 332:301–328
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