sentences:  The youngest igneous rocks, in the Dominican Republic and Costa Rica, are from 63 Ma.That the CLIP originated in the Pacific is obvious because fragments of oceanic crust accreted to the margins of the Caribbean, for example on Hispaniola and Puerto Rico, contain fauna of Pacific provenance.The Farallon Plate's eastward movement forced the northern half of the CLIP into the ocean basin that had opened between North and South America starting in the Jurassic.