Talemzane crater
Madna or Talemzane is an impact crater in Algeria, 40 km south-east of Hassi Delaa.
Explored for the first time in 1928, studied in 1950 and 1988 by researchers from the universities of Oran and Nice. It is 1.75 km in diameter and the age is estimated to be less than three million years and is probably Pliocene.
