...Fig. 2. Stratigraphic columns of the Douro Group formations of the Douro–Beiras Supergroup (DBSG) with the position of the analysed samples (U–Pb detrital zircon) in this study by laser ablation inductively coupled plasma mass spectrometry ( Sá et al. 2005 ; Dias et al. 2013 ; Silva 2013 ). ...

... contre, dans l’attente de nouvelles informations, ce groupe est maintenu dans le genre Borealaspis . La durée stratigraphique de ce groupe d’espèces est prolongée du Wenlock inférieur (Sheinwoodien) au Ludlow superieur (Ludfordien) suite à la découverte d’une espèce rare dans la Formation de Douro de...

...Owen A. Dixon Abstract Heliolitine corals occur in Upper Silurian strata of the topmost Douro, lower Barlow Inlet, and lower Somerset Island formations in the Booth Uplift region. The fauna includes Heliolites (nine species), Propora (two species), the stelliporellid genera Podollites (three...

... to th e status of a group, in which case the Douro Formation may be one of its formations . On southern Ellesmere Island Kerr (1968) mapped a transitional uni t of limestone and dolomite between the Allen Bay and Douro formations . These rocks on southwestern Ellesmere Island had until then bee n...

... and strophomenid brachiopods, gastropods, trilobites, and solenoporacean lgae. THE DOURO-BARLOW INLET TRANSITIONAL SEQUENCE The transitional sequence is up to 74 m thick, where exposed, and can be divided into three principal groups of facies (Fig. 3). The sub-reef mound facies form persistent units...

... (lowland) paleoenvironments during dry climatic intervals. In this paper, we document the first occurrence of Lesleya during the Carboniferous on the Iberian Massif, in lower Gzhelian (Upper Pennsylvanian) strata of the Douro Carboniferous Basin, in northwestern Portugal. This newly discovered occurrence...

...H. P. ZECK; M. J. WHITEHOUSE; J. M. UGIDOS Abstract Ion microprobe (SIMS) dating of zircon from the Miranda do Douro orthogneiss, Central Iberian Zone, Hercynian Iberian belt, defines an Early Ordovician U–Pb age of 496.0 ± 2.6 Ma (95 % conf., MSWD = 1.14) for magmatic zircon crystallization in its...

... of a compositional gap between the K- and NH 4 -micas was proposed by Juster et al. (1987) . In the Douro-Beira samples, the simultaneous presence of two groups of mica compositions, one K rich and the other K poor, is demonstrated by XRD diagrams (Fig. 2 ), lattice fringe images (Fig. 7 ), SAED (inset Fig. 8...

... deep-water turbiditic sands interbedded with shales of the Baixo Alentejo Flysch Group (Oliveira, Horn & Paproth, 1979 ; Oliveira, 1990 ), and Tournaisian to upper Bashkirian platform carbonates and shales of the Southwest Portugal Domain (Oliveira, 1990 ; Pereira, 1999 ) ( Fig...

... Silurian System (Packard, 1985; de Freitas and Mayr, 1993). Arctic studies on biostratigraphically useful fossil groups, other than conodonts and graptolites, are not as plentiful. Adrain and Edgecombe (1997) described Silurian trilobites from the Cape Phillips Formation and Lenz (1974) and Jones (e.g...

.... To the north, however, the basement is characterized by a more varied lithology of pelites intercalated with abundant conglomerates and limestones or dolomites ( Oen 1970 ; Teixeira 1972 ; Schermerhorn 1977 ). Based on this contrast, these basement formations have been assigned to the Beiras and Douro groups...

...) of the study area. The dendritic drainage networks of the study area belong to the Douro River basin and specifically to the left-side tributary system of the Douro River. The study area is bounded to the north and west by the Douro River, to the southwest by the Agueda River, and it is crossed east...

... of the head of Hourglass Bay at Point A, the Goose Fiord Formation lie s unconformably upon the Devon Island Formation (Sde) and Douro Forma- tion (Sdo) . The unconformity cuts downward stratigraphically to th e northwest and northeast toward the Cape Storm fault, where more tha n a hundred metres of rock...

... is interpreted as a coastal-fan complex that was derived from a north-northwest source, possibly from reactivated fault scarps that also may have controlled the Ordovician - Upper Silurian basin (Cape Phillips Formation) to shelf (Allen Bay Formation, Read Bay Group) facies change in the Laura Lakes district...

... characterization of rock masses by ISRM (1978a , b , 1981 ) and the Geological Society Engineering Working Group (1995) . A geotechnical datasheet was used for the recognition and visual evaluation of the rock material constituting the groin. A georeferenced GIS database for this structure was then set up using...

... in the Seven Rivers formation of the Whitehorse group. The producing sand, which is locally called the Soma sand, was found from 1,028 to 1,039 feet in depth. The stratigraphic section in the discovery well of the Noelke field is as follows. The Soma Oil and Gas Syndicate’s W. T. Noelke No. 1 flowed...

... controlled by landscape and soil variations, thereby creating numerous interactions within these factors. Figure 1 An eddy covariance system installed in a vineyard in the Alijó-Favaios region of the Douro Valley (Portugal). Tower sensors monitor physical and chemical properties of atmosphere-related...