Lake Bosumtwi Drilling Project

Bosumtwi Impact Structure, Ghana, West Africa

The Bosumtwi impact crater in Ghana is almost completely filled by Lake Bosumtwi with a rim-to-rim diameter of about 11 km, while the lake has a diameter of about 8 km and maximum depth of about 80 m. The crater has an age of 1.07 Ma and was excavated in lower greenschist facies metasediments of the 2.1-2.2 Ga age. The Ivory Coast tektites and microtektites originated from this crater.  Bosumtwi is one of only two known young craters of this size, and may have a crucial diameter at the changeover between a traditional “complex” crater with a central peak and a crater structure that has a central peak-ring system.

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