During this period of time, non-decomposed organic matter formed black shale and this period of time began after the "Great Dying" which occurred at the end of the Permian.
During this period of time, non-decomposed organic matter formed black shale and this period of time began after the "Great Dying" which occurred at the end of the Permian. The end of this geologic Era is marked by the K-T extinction event, which according to the Alvarez hypothesis was caused by a large asteroid. For 20 points, name this geologic era consisting of the Triassic, Jurassic and Cretaceous periods.
During this period of time, non-decomposed organic matter formed black shale and this period of time began after the "Great Dying" which occurred at the end of the Permian.
{Mesozoic} Era [accept {Triassic} period until " K-T " is spoken]