1000 B.C.
1000 B.C.: Ortoiroid groups reached Puerto Rico and established a cultural frontier with the Casimiroid peoples living in Hispaniola.
1000 B.C.: Ortoiroid groups reached Puerto Rico and established a cultural frontier with the Casimiroid peoples living in Hispaniola. This proximity allowed for the northwest-to-southeast diffusion of various stone-working traditions across the Mona Passage.
Source · p. 62
Rouse, The Tainos, 62