Reimold, W UArmstrong, RichardKoeberl, Christian2015-12-130012-821Xhttp://hdl.handle.net/1885/72201The Morokweng impact structure in South Africa was formed 145 Ma ago, at the time of the minor mass extinction that marks the Jurassic-Cretaceous boundary. Previous size estimates for the Morokweng impact structure ranged between 70 and 340 km, and thoseKeywords: crater; impact structure; Jurassic-Cretaceous boundary; mass extinction; petrography; SHRIMP dating; size; South Africa Absolute ages; Catastrophes; Cretaceous; Granophyre; Impact craters; Impact features; Jurassic; SHRIMP dataA deep drillcore from the Morokweng impact structure, South Africa: petrography, geochemistry, and constraints on the crater size200210.1016/S0012-821X(02)00658-12015-12-11