Stromatolite recognition in ancient rocks: an appraisal of irregularly laminated structures in an Early Archaean chert-barite unit from North Pole,Western Australia

The word ‘stromatolite’ should only be applied to organosedimentary structures predominantly accreted by sediment trapping, binding and/or in situ precipitation as a result of the growth and metabolic activities of benthic, principally prokaryotic, micro-organisms. Structures of uncertain origin that resemble stromatolites should be called ‘stromatoloids’. This cautious approach would eliminate the currently common assumption that structures with mesoscopic morphological similarities to microbially accreted sedimentary structures must be biogenic, a misconception that hampers investigations into the antiquity of life.

A hierarchical series of meso- and microstructural attributes of stromatolites can be used to assign gradually increasing probabilities of biogenicity to stromatoloids. This method is particularly useful for interpreting ancient noncolumnar stromatoloids with poor microstructural preservation. In a range of Early Archaean pseudocolumnar, nodular and stratiform stromatoloids from North Pole studied using this method, none could be proved to be stromatolites and only a few are probable or possible stromatolites. As these stromatoloids closely resemble previously reported structures from North Pole interpreted as stromatolites, we consider that the evidence for the existence of life c. 3500 my ago at North Pole is less definitive than previously supposed.     

What the drone saw: the cultural optics of the unmanned war

The dramatic growth of drone warfare in the last decade has meant the arrival of a new kind of war imagery in civilian life: the view through the drone camera. As such, the drone is not simply a weapon, but also an emerging medium for representing conflict. This article explores the ways this imagery has been selected, interpreted, framed and put to use in public and popular culture. In addition to exploring how these practices of looking fit within the larger history of war imagery, two prominent features of ‘drone vision’ are identified: the promotion of consumer interactivity in the drone war and the militarising of domestic space.     

Allied escapers and the contadini in occupied Italy (1943 – 5) 1

Abstract

The little-known ‘great escape’ of Allied prisoners-of-war (some 50,000) held in Italian camps at the time of the armistice of 8 September 1943 provides the starting-point for a fresh interpretation of popular and peasant experience during the emergency of 1943 – 5. The article explores some of the main aspects of the ‘strange alliance’ between Allied fugitives and the Italian population, with particular attention to the mutual symbolic appropriation between former ‘enemies’ in the midst of a civil war and related collapse of the state.     

Interview with Sara Margaret Evans

Born in 1943 in South Carolina, Evans graduated from high school in Dallas, Texas, and received her B.A. and M.A. degrees from Duke University and her Ph.D. from the University of North Carolina, Chapel Hill. She began teaching at the University of Minnesota in 1976 and has been Distinguished McKnight University Professor since 1997. Her Personal Politics related U.S. women's liberation to the Civil Rights and New Left movements. Her Born for Liberty: A History of American Women is in its second edition and has been translated into a number of foreign languages. A noted activist, feminist, and teacher, Evans has coauthored books on women's history, consulted on several video productions, participated in national review panels, and served on the boards of various professional organizations. She has a 31-year-old son and a 19-year-old adopted daughter from Korea. This interview was conducted in Evans's office at the University of Minnesota by Roger Adelson in March 2000.