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We report the discovery in the Greenland ice sheet of a discrete layer of free nanodiamonds (NDs) in very high abundances, implying most likely either an unprecedented influx of extraterrestrial (ET) material or a cosmic impact event that occurred after the last glacial episode. From that layer, we extracted n-diamonds and hexagonal diamonds (lonsdaleite), an accepted ET impact indicator, at abundances of up to about 5×106 times background levels in adjacent younger and older ice. The NDs in the concentrated layer are rounded, suggesting they most likely formed during a cosmic impact through some process similar to carbon-vapor deposition or high-explosive detonation. This morphology has not been reported previously in cosmic material, but has been observed in terrestrial impact material. This is the first highly enriched, discrete layer of NDs observed in glacial ice anywhere, and its presence indicates that ice caps are important archives of ET events of varying magnitudes. Using a preliminary ice chronology based on oxygen isotopes and dust stratigraphy, the ND-rich layer appears to be coeval with ND abundance peaks reported at numerous North American sites in a sedimentary layer, the Younger Dryas boundary layer (YDB), dating to 12.9 ± 0.1 ka. However, more investigation is needed to confirm this association.
By upbringing, family connections, and education, Felix Mendelssohn was ideally positioned to contribute to the historical legacies of the German people, who in the aftermath of the Napoleonic Wars discovered that they were a nation with a distinct culture. The number of cultural icons of German nationalism that Mendelssohn "discovered," promoted, or was asked to promote (by way of commissions) in his compositions is striking: Gutenberg and the invention of the printing press, Dürer and Nuremberg, Luther and the Augsburg Confession as the manifesto of Protestantism, Bach and the St. Matthew Passion, Beethoven and his claims to universal brotherhood. The essays in this volume investigate Mendelssohn's relationship to the music of the past from a variety of perspectives, including the pervasive presence of Bach's music within the larger Mendelssohn family, the influence of Beethoven in the Reformation Symphony, and Mendelssohn's compositions for organ and his relationship to English organs in particular. Together, they shed light on the construction of legacies that, in some cases, served to assert German cultural supremacy only two decades after the composer's death. Contributors: Celia Applegate, John Michael Cooper, Hans Davidsson, Wm. A. Little, Peter Mercer-Taylor, Siegwart Reichwald, Glenn Stanley, Russell Stinson, Benedict Taylor, Nicholas Thistlewaite, Jürgen Thym, R. Larry Todd, Christoph Wolff. Jürgen Thym is Professor Emeritus of Musicology at the Eastman School of Music and editor of Of Poetry and Song: Approaches to the Nineteenth-Century Lied (University of Rochester Press, 2010).