by: Charles O’Dale
- IMPACT CRATER/STRUCTURE IDENTIFICATION – Geologic confirmation for an impact event:
- DATING – IMPACT GEOLOGY:
– CRATERS,– GEOLOGIC,– IMPACT MELTS AND GLASSES,– ISOCHRON,– RADIOMETRIC DATING,– TEKTITES, and– DATING GLOSSARY.
- CRATER FORMATION – Impact involves the transfer of massive amounts of energy to a relatively small area of the Earth’s surface, in an extremely short period of time (Kinetic energy). Three stages of crater formation:
– contact & compression;– excavation; and– modification.
- CRATER CLASSIFICATION – On this planet, impact craters are divided into three basic morphologic subdivisions:
– simple craters;– complex craters; and– peak ring craters.
- PLANET VS CRATER SIZE – The primary factors governing the size and shape of impact craters are:
– impact energy;– gravity; and– properties of the target.
– introduction– meteorite categories;– dating meteorites;– meteorite glossary; and– reference.
- CANADIAN CRATERS – Documented in 1967 & 1975.
Osinski G. The Geological Record of Meteorite Impacts Canadian Space Agency 2018
ANN M. THERRIAULT – RICHARD A. F. GRIEVE – MARK PILKINGTON The recognition of terrestrial impact structures Natural Resources Canada