 Calabozos is responsible for the huge Loma Seca Tuff , a body of material 200 cubic kilometres ( 48 cu mi ) to 500 cubic kilometres ( 120 cu mi ) in volume . It accumulated over at least three eruptive periods , beginning 800 @,@ 000 years ago ( 0 @.@ 8 mya ) and lasting until 150 @,@ 000 years ago ( 0 @.@ 15 mya ) . 
