Mathematics – Logic
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987sci...237.1603o&link_type=abstract
Science (ISSN 0036-8075), vol. 237, Sept. 25, 1987, p. 1603-1605. Research supported by the National Geographic Society and Depa
Mathematics
Logic
19
Chronology, Impact Damage, Meteorite Craters, Mineralogy, Breccia, Northwest Territories, Nuclear Fission, Particle Tracks
Scientific paper
Haughton Astrobleme is a major extraterrestrial impact structure located on Devon Island in the Canadian Arctic Archipelago, Northwest Territories. Apatite grains separated from shocked Precambrian gneiss contained in a polymict breccia from the center of the astrobleme yielded a fission-track date of 22.4 million + or - 1.4 million years before the present or early Miocene (Aquitanian). This provides a date for the impact event and an upper limit on the age of crater-filling lake sediments and a flora and vertebrate fauna occurring in them. A geologically precise date for these fossils provides an important biostratigraphic reference point for interpreting the biotic evolution of the Arctic.
Blyth Robertson P.
Dawson Robert M.
Hickey Leo J.
Johnson Kirk R.
Omar Gomma
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