The historical concept and definition of sexual orientation varies and has changed greatly over time; for example the word gay wasn't used to describe sexual orientation until the mid-20th century.A number of different classification schemes have been used to describe sexual orientation since the mid-19th century, and scholars have often defined the term "sexual orientation" in divergent ways.Moreover, there are clear verbal borrowings in the text from the Roskilde Chronicle and its somewhat later continuation, a fact which provides a date at the end of the 12th century and which have led scholars to establish its connection to Roskilde. Anders Leegaard KNUDSEN (2000, 5-7) points out that anti-German feelings were strong in the thirteenth century, too, thus weakening the foundations of Gertz’s dating.On the basis of the pronounced anti-German bias of the text Gertz dates it to the second half of the twelfth century, or c. TOLDBERG (1963) seems to be the only one who argues for a date earlier than the mid-twelfth century: he is inclined towards a dating to the reign of Knud II the Great (1016-35), whose rivalry with the German empire was a political fact; this would explain the British element among the sources of the chronicle (cp. According to Hemmingsen the particular blend of source material which we find in the chronicle is most likely to have been brought together in the early 1190s (HEMMINGSEN 1996, 465-7), but he finds it probable that the original text of the Latin chronicle was revised in the thirteenth century, perhaps more than once (ibid. The Chronicon Lethrense is a history of pre-Christian Denmark.Find out more about the Kindle Personal Document Service.Postdoctoral Fellow Lunar and Planetary Institute 3600 Bay Area Boulevard Houston, TX 77058 E-mail: [email protected] Office: (281) 486 -2116 I obtained my doctoral degree in Geology (Dr. nat.) from the University of Stuttgart and have mainly been working on the geology of large meteorite impact structures on Earth. Impact cratering has shaped the surface of our planet and other bodies in space ever since. Large impacts have had a major influence on the evolution of the Earth’s biosphere and the generation of economic deposits.
Statistical analysis is becoming much more widely used in conjunction with radiocarbon dating.
My previous and ongoing research includes the optical microscopic and SEM-aided petrography and geochemistry of impactites, meteorites, and shock metamorphic effects in rocks and minerals; classical field geology; the sedimentology of impact structures and materials; remote sensing; and the isotopic dating of large impact events using the Ar dating technique on impact melt rocks and glasses, and U–Pb dating of impact-metamorphosed zircons. For more information and a full publication list, please visit my personal website
(2016): A pressure-temperature phase diagram for zircon at extreme conditions.
(2016): The Gao-Guenie impact melt breccia – Sampling a rapidly cooled impact melt dike on an H-chondrite asteroid?
H., Trieloff, M., Buchner, E., Hopp, J., Tohver, E., Pesonen, L.