The deccan traps in happened at the same time as the cretaceous mass extinction.

The deccan traps in Jurassic times happened at the same time as the cretaceous mass extinction.

your answer is "the 1950's"

that would be called plucking : )

explanation:

''plucking, also referred to as quarrying, is a glacial phenomenon that is responsible for the erosion and transportation of individual pieces of bedrock, especially large "joint blocks". as a glacier moves down a valley, friction causes the basal ice of the glacier to melt and infiltrate joints (cracks) in the bedrock."