Drilling Projects By
Climate & Ecosystems
Sustainable Georesources
Natural Hazards
World
Geological Time
Africa
- Maps of Africa
- Afar Dallol Drilling (Ethiopia)
- Barberton 1 (S. Africa)
- Barberton 2 (S. Africa)
- Barberton 3 (S. Africa)
- Bushveld (S. Africa)
- Eastern Rift Valley (Ethiopia, Kenya)
- La Réunion (France)
- Lake Bosumtwi (Ghana)
- Lake Chad (Chad)
- Lake Challa (Kenya, Tanzania)
- Lake Malawi (Malawi)
- Lake Tanganyika (Tanzania)
- Morocco
- Nama Group (Namibia)
- Orkney (S. Africa)
- Tanzania
- Witwatersrand (S. Africa)
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.
