You are not currently logged in.
Access your personal account or get JSTOR access through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Late Early Eocene Montagnais Bolide: No Impact on Biotic Diversity
Marie-Pierre Aubry, Felix M. Gradstein and Lubomir F. Jansa
Vol. 36, No. 2 (1990), pp. 164-172
Published by: The Micropaleontology Project., Inc.
Stable URL: http://www.jstor.org/stable/1485500
Page Count: 9
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
The suggestion that mass extinctions may have been triggered by extraterrestrial events has raised a significant controversy which may not be resolved until it can be shown that the timing of a mass extinction and that of an extraterrestrial event coincide precisely. There are great difficulties associated with the comparison of the record of mass extinctions with that of impact craters because, as Sepkoski and Raup (1986) pointed out, both are dated by totally independent means. There is also a question as to the size required for an impacting object to provoke mass extinction. The Montagnais impact crater is the first impact event which can be directly and precisely correlated to the marine stratigraphic record through biostratigraphic means. Its occurrence during the late early Eocene, between 52.6 and 53.4 Ma, at a time when Cenozoic diversity was at its peak, indicates that no global effect on biologic diversity can be expected from the impact in the ocean of a bolide 1.5 to 3 km in diameter.
Micropaleontology © 1990 The Micropaleontology Project., Inc.