NASA NTRS · 20210001123
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Chodas, P.. 1999-06-27. The Impact Threat and Public Perception. https://ntrs.nasa.gov/citations/20210001123
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The Manson Impact Structure (MIS) is located in northwest Iowa, has an age of approximately 74 Ma, and diameter of approximately 35 km. MIS is characterized by a central uplift of crystalline rock surounded by a depression filled with breccia and in turn surrounded by a terraced rim of slumped blocks. MIS is buried by glacial till; hence the geology must be studied through coring and geophysical techniques. Here, results of a gravity survey are reported. The residual gravity pattern is complicated by numerous highs and lows associated with density variations within the crystalline basement. The gravity data indicate a complex central uplift, perhaps a pitted central peak; a breccia unit approximately 3000 m thick surrounding the central uplift, and a diameter of about 35 km.
This paper presents estimations of the current impact rates of comets on Pluto and Charon.