Following impact, the carbonate platform collapsed, depositing the coarse breccias, which were then overlain mixed and overlain by finer breccias from the consequent tsunamis. Folding occurred in the early Miocene to Pliocene and the compression forced up Cretaceous and Upper Jurassic blocks forming the Structural trap in which hydrocarbons migrated in the Miocene. There are four blocks in the Cantarell Complex, Akal, Nohoch, Chac and Kutz with the Akal block underlain by a fifth block, Sihil, where oil was discovered in 1998.