The Laramide  orogeny
The eruption of the Deccan traps may have contributed to the end of this geologic period,   during which rudists were the most important reef-builders in the Tethys Ocean. The Laramide  orogeny [aw-RAH-jeh-nee] began lifting the Rocky Mountains in this period that also saw the evolution   of the first mammals and flowering plants. The White Cliffs of Dover formed during this period,  whose characteristic chalk deposits give it its name, and the Chicxulub [CHIK- shoo-loob] crater in  Mexico records the impact event that likely ended this period. It followed the Jurassic period and is  noted for diverse dinosaur species. Name this final period of the Mesozoic era.
The eruption of the Deccan traps may have contributed to the end of this geologic period,   during which rudists were the most important reef-builders in the Tethys Ocean.
Cretaceous period