MANSON IMPACT STRUCTURE
ANATOMY OF AN IMPACT CRATER

GEOLOGICAL SOCIETY OF AMERICA
SPECIAL PAPER 302

edited by C. Koeberl and R.R. Anderson, 1996

A comprehensive description of research on the 38-km-diameter Manson impact structure in north-central Iowa. This structure, one of abour 20 confirmed impact structures in the U.S., was initially suspected as one factor in the K-T boundary drama. The possive association with the K-T boundary led to an increase in research on the Manson structure in the 1980s. Then, in 1991-1992 the Iowa Geological Survey and the U.S. Geological Survey conducted a Manson core-drilling program. The results of many of the investigations on samples of Manson conre and related studies are reported in this volume. The contents of the volume range from geophysical studies of the crater structure to detailed mineralogical, petrological, and geochemical investigations of rocks from the cores, and from documentation of post-impact hydrothermal events to the study of possible distal impact deposits in South Dakota and Nebraska. These studies also have produced a more accurate age of Manson at about 74 Ma, discrediting theories that the Manson impact was associated with the K-T boundary events.

SPE302, 484 p., . . . . indexed, ISBN 0-8137-2302-7, . . . . $99.50

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