Willumsen P.S.,University of Oslo |
Willumsen P.S.,University of Aarhus |
Dale B.,University of Oslo |
Jolley D.W.,Kingss College |
Palynology | Year: 2014
A palynological investigation of 15 ditch cutting samples from Borehole 8, located off the Angolan coast, westcentral Africa, revealed Late Oligocene (Chattian) to latest Middle to earliest Early Miocene (Serravallian/earliest Tortonian?) marine dinoflagellate cysts, freshwater colonial algae and terrestrial palynomorphs. Various early Miocene pollen characterising the Verrutricolporites rotundiporus Zone of Legoux (1978) confirm the location of the Oligocene-Miocene boundary in relation to a new short-ranging early Miocene dinoflagellate cyst taxon Cristadinium headii sp. nov. The Oligocene to Miocene dinoflagellate cyst assemblages reflect three periods, A-C, with high palaeoproductivity, corresponding to periods in the latest Oligocene (late Chattian), Early Miocene (late Aquitanian-early Burdigalian?) and the base of the Middle Miocene (Langhian). Early to middle Miocene acme intervals of Cleistosphaeridium placacanthum and Cribroperidinium tenuitabulatum are considered to reflect two regional oceanographic events due to intense upwelling along the West African coast. A distinct Early Miocene episode of brackish-water outflow from the nearby Angolan mainland is also reflected by the palynological assemblages, perhaps linked to the global Mi-1 event. Changes in relative abundance of grass pollen indicate a gradual change towards a drier and perhaps also warmer Burdigalian-Langhian climate during which the Angolan savanna developed, followed by cooler and perhaps more humid conditions following the Miocene Climatic Optimum. ©2014 AASP - The Palynological Society.
Alexandre J.,Kingss College |
Mavromatos N.E.,Kingss College
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2010
We consider a time-dependent bosonic string in graviton, dilaton and tachyon backgrounds, for which it was already shown that conformal invariance is respected to all orders in α′ and in any space-time dimension. Assuming that the tachyon is off-shell, we show in this note that the specific time-homogeneity of the corresponding space-time effective action leads to a power-law expanding Universe, that can be interpreted as dark energy. We arrive at this result without requiring the knowledge of the structure of the string effective action, which is not known to all orders in α′. Moreover, in our approach, the background configurations are consistent in a four-dimensional space-time, without any need for extra dimensions. © 2009 Elsevier B.V. All rights reserved.
Jolley D.W.,Kingss College |
Passey S.R.,Jardfeingi Faroese Earth and Energy Directorate |
Hole M.,Kingss College |
Millett J.,Kingss College
Journal of the Geological Society | Year: 2012
The 6.6 km gross thickness of the Palaeogene lava field of the Faroe Islands Basalt Group was erupted in the initial phases of North Atlantic rifting. Thin interlava sedimentary rocks yield palynofloras that vary in composition and diversity with the duration of the interlava period. Long-term trends in plant ecological succession occur within the record, each reflecting initially rapid and subsequently slowing eruption tempo. TiO 2 and MgO plots derived from the basalt lava flows show corresponding fractionation trends. These link melt column processes to vegetation ecosystem dynamics via controls on eruption tempo, thermal support and substrate disturbance.
Bone J.,Kingss College
Globalizations | Year: 2012
Over the last few decades there have been a multitude of critical works focusing on the ethical and moral implications of the (re)turn to 'free markets' associated with neoliberalism. Many focus on the way in which the culture of the latter, with its lionisation of self-interest, promotes selfishness and greed and, thus, represents a corrosive influence on social mores. This piece, while fully accepting such arguments, further asserts that the push for increasing deregulation of the economic sphere, the concomitant move to divert the latter of wider social responsibilities, as well as rising inequalities of wealth, power and influence, taken together exert a further significant, but hitherto under acknowledged influence, exacerbating the asserted 'irrationality' and amorality of the neoliberal credo. Drawing on a range of sources, including new understandings of the individual emerging from the fledgling area of neurosociology, it is argued that all of the aforementioned aspects of neoliberalism coalesce to undermine the rationality, propriety and empathy of its adherents. In some senses, as is argued, this represents an antithesis to the Weberian vision of rational capitalism as imagined in the 'Protestant Ethic'. © 2012 Copyright Taylor and Francis Group, LLC.
Jolley D.,Kingss College |
Gilmour I.,Open University Milton Keynes |
Gurov E.,Ukrainian Academy of Sciences |
Kelley S.,Open University Milton Keynes |
Watson J.,Open University Milton Keynes
Geology | Year: 2010
The end-Cretaceous mass extinction has been attributed by most to a single asteroid impact at Chicxulub on the Yucatán Peninsula, Mexico. The discovery of a second smaller crater with a similar age at Boltysh in the Ukraine has raised the possibility that a shower of asteroids or comets impacted Earth close to the Cretaceous-Paleogene (K-Pg) boundary. Here we present palynological and δ13C evidence from crater-fill sediments in the Boltysh impact crater. Our analyses demonstrate that a post-impact flora, formed on the ejecta layer, was in turn devastated by the K-Pg event. The sequence of floral recovery from the K-Pg event is directly comparable with that in middle North America. We conclude that the Boltysh crater predated Chicxulub by ~2-5 k.y., a time scale that constrains the likely origin of the bodies that formed the two known K-Pg craters. © 2010 Geological Society of America.