416 research outputs found
Constructing the Patriarchal City: Gender and the Built Environments of London, Dublin, Toronto, and Chicago, 1870s into the 1940s
No full textBook review by Laura Shillington of Constructing the Patriarchal City: Gender and the Built Environments of London, Dublin, Toronto, and Chicago,1870s into the 1940s, author Maureen A. Flanagan
Seismic data reveal eastern Black Sea Basin structure
No full textRifted continental margins are formed by progressive extension of the lithosphere. The development of these margins plays an integral role in the plate tectonic cycle, and an understanding of the extensional process underpins much hydrocarbon exploration. A key issue is whether the lithosphere extends uniformly, or whether extension varies\ud
with depth. Crustal extension may be determined using seismic techniques. Lithospheric extension may be inferred from the waterloaded subsidence history, determined from\ud
the pattern of sedimentation during and after rifting. Unfortunately, however, many rifted margins are sediment-starved, so the subsidence history is poorly known.\ud
To test whether extension varies between the crust and the mantle, a major seismic experiment was conducted in February–March 2005 in the eastern Black Sea Basin (Figure 1), a deep basin where the subsidence history is recorded\ud
by a thick, post-rift sedimentary sequence. The seismic data from the experiment indicate the presence of a thick, low-velocity zone, possibly representing overpressured sediments. They also indicate that the basement and\ud
Moho in the center of the basin are both several kilometers shallower than previously inferred. These initial observations may have considerable impact on thermal models of the petroleum system in the basin. Understanding\ud
the thermal history of potential source rocks is key to reducing hydrocarbon exploration risk. The experiment, which involved collaboration between university groups in the United Kingdom, Ireland, and Turkey, and BP and\ud
Turkish Petroleum (TPAO), formed part of a larger project that also is using deep seismic reflection and other geophysical data held by the industry partners to determine the subsidence history and hence the strain evolution of\ud
the basin
T. Nutter statements
No full textTwo statements by T. Nutter for receiving payments from George Craghead, Esquire. First, he received the sum of 38 pounds and 3 shillings for two month's allowance for him as a Captain in the Delaware Regiment. Second, he received 117 pounds and 10 shillings for two month's allowance for his Lieutenants, John Rhod, Paul Quenouault, Elijah Shillington, and Joseph Horseman of the Delaware Regiment
Kevin Shillington, Patrick van Rensburg: Rebel, Visionary and Radical Educationist. A Biography
No full textWhatever you thought you knew about Patrick van Rensburg will be a small fraction of the life so thoroughlydocumented here. Biographer Kevin Shillington, familiar to these parts as an Education and Historylecturer at the University of Botswana in the 1980s, publisher of key works on the nineteenth centuryBatlhaping, and author among others of the long-selling History of Africa (Macmillan, Red Globe, nowin its 4th edition) brings his research skills and knowledge of the region to deliver a first-class rendition ofone of Botswana’s signal figures in the late colonial and early postcolonial period. Shillington’s account isbased on extensive familiarity with persons who knew or worked with Van Rensburg, his autobiographicaland other writings, and a firm grounding in the major events unfolding in Southern Africa when Patrickmade his mark. The publication is sponsored by The Foundation for Education with Production (FEP),among Van Rensburg’s many progeny
T. Nutter statements
No full textTwo statements by T. Nutter for receiving payments from George Craghead, Esquire. First, he received the sum of 38 pounds and 3 shillings for two month's allowance for him as a Captain in the Delaware Regiment. Second, he received 117 pounds and 10 shillings for two month's allowance for his Lieutenants, John Rhod, Paul Quenouault, Elijah Shillington, and Joseph Horseman of the Delaware Regiment
Thermal alteration of terrestrial palynomorphs in mid-Cretaceous organic-rich mudstones intruded by igneous sill (Newfoundland Margin, ODP Hole 1276A)
No full textMost approaches used to reconstruct thermal alteration of sediments necessitate advanced, relatively expensive analytical techniques. We have evaluated the fidelity of a less costly, relatively simple approach of visually assessing sporomorph colours to determine thermal alteration. The sporomorph-based thermal alteration estimates were compared to vitrinite reflectance data from the same samples. As study material, we selected a succession of mid-Cretaceous (Albian) organic-rich clay- and siltstones intruded by a diabase sill that was recovered from Ocean Drilling Program (ODP) Hole 1276A, off Newfoundland. Six sporomorph groups (SG), each consisting of morphologically well-defined, easily identifiable constituents with long stratigraphic ranges, were individually evaluated for their thermal alteration signals. These groups are: (1) leiotrilete spores of the genera Biretisporites, Cyathidites, Deltoidospora, Dictyophyllidites, Gleicheniidites, and Leiotriletes (SG-1; subdivided into three subgroups SG-1a, SG-1b and SG-1c with sporoderm thicknesses <1 ?m, 1–1.5 ?m and >1.5 ?m, respectively); (2) trilete, rugulate spores of the genera Camerozonosporites and Lycopodiacidites (SG-2); (3) trilete, striate spores of the genera Appendicisporites, Cicatricosisporites and Plicatella (SG-3); and (4) the gymnosperm-pollen taxon Classopollis torosus (SG-4). Sporomorph colours were determined using Munsell colour standards under reproducible optical conditions. To minimize the potential influence of reworked specimens on the dataset, only the lightest 50% of all counted specimens per sporomorph group were evaluated for their
thermal alteration signals.
The thermal alteration estimates from all sporomorph groups yield an internally consistent picture that is compatible with vitrinite reflectance data from the same samples. They indicate that downhole thermal alteration does not increase until 20 m above the igneous sill. A steep rise occurs only at 4.23 m above the sill, and thermal alteration peaks in the sample closest (2.17 m) to the sill. However, the different sporomorph groups exhibit varying degrees of fidelity with respect to deciphering thermal alteration. Factors influencing the precision of the thermal alteration signal include sporoderm thickness, character of surface ornamentation, resistance to reworking, and abundance in the sample material. Highest correlations with vitrinite reflectance data are observed for the thermal alteration values from SG-1b (R=0.82), SG-3 (R=0.80) and SG-4 (R=0.80). Hence, these groups are best suited for a sporomorph-based approach to reconstructing the thermal history of sediments. The highest correlation coefficient with vitrinite reflectance data is registered for SG-1b, the subgroup with the least variability of sporoderm thickness and the highest abundance in the sample material. This indicates that the study of morphologically similar, highly abundant specimens with strongly constrained sporoderm thickness variations yields the best results for the reconstruction of thermal alteration
Crustal structure of the Mid Black Sea High from wide-angle seismic data
No full textThe Mid Black Sea High comprises two en echelon basement ridges, the Archangelsky and Andrusov ridges, that separate the western and eastern Black Sea basins. The sediment cover above these ridges has been characterized by extensive seismic reflection data, but the crustal structure beneath is poorly known. We present results from a densely sampled wide-angle seismic profile, coincident with a pre-existing seismic reflection profile, which elucidates the crustal structure. We show that the basement ridges are covered by approximately 1–2 km of pre-rift sedimentary rocks. The Archangelsky Ridge has higher pre-rift sedimentary velocities and higher velocities at the top of basement (c. 6 km s−1). The Andrusov Ridge has lower pre-rift sedimentary velocities and velocities less than 5 km s−1 at the top of the basement. Both ridges are underlain by approximately 20-km-thick crust with velocities reaching around 7.2 km s−1 at their base, interpreted as thinned continental crust. These high velocities are consistent with the geology of the Pontides, which is formed of accreted island arcs, oceanic plateaux and accretionary complexes. The crustal thickness implies crustal thinning factors of approximately 1.5–2. The differences between the ridges reflect different sedimentary and tectonic histories
F.E. Archer with group celebrating his 93rd birthday
No full textBack row- Jack Patterson, Mrs. Leonie Butler, Mrs. Shillington, Sarah Skillicorn, Fred Speirs, T. Billings, Mrs. McQueen, Ron Hewat, Logan McPhee, (Dr.) Mr. Shillington, Jack Cadden, Gordon Bowker, F.E. Archer, in chair
Continental breakup and the onset of ultra-slow seafloor spreading off Flemish Cap on the Newfoundland Rifted Margin
No full textPrestack depth-migrated seismic reflection data collected off Flemish Cap on the Newfoundland margin show a structure of abruptly thinning continental crust that leads into an oceanic accretion system. Within continental crust, there is no clear evidence for detachment surfaces analogous to the S reflection off the conjugate Galicia Bank margin, demonstrating a first-order asymmetry in final rift development. Anomalously thin (3–4 km), magmatically produced oceanic crust abuts very thin continental crust and is highly tectonized. This indicates that initial accretion of the oceanic crust was in a magma-limited setting similar to present-day ultraslow spreading environments. Seaward, oceanic crust thins to <1.3 km and exhibits an unusual, highly reflective layering. We propose that a period of magma starvation led to exhumation of mantle in an oceanic core complex that was subsequently buried by deep-marine sheet flows to form this layering. Subsequent seafloor spreading formed normal, 6-km-thick oceanic crust. This interpretation implies large fluctuations in the available melt supply during the early stages of seafloor spreading before a more typical slow-spreading system was established
Jesus and his parables. : interpreting the parables of Jesus today.
No full textEdinburghxvi, 199 p.; 22 cm
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