 Outside of Taiwan, assemblages of red-slipped pottery, plainware, and incised and stamped pottery associated with the Austronesian migrations are first documented from around 2000 to 1800 BCE in the northern Philippines, from sites in the Batanes Islands and the Cagayan Valley of Northern Luzon.From there pottery technology rapidly spread to the east, south, and southwest.One branch of the migrations carried pottery to the Marianas Islands at around 1500 BCE, where the earliest archaeological sites have uncovered pottery very similar to those found in the Nagsabaran Site (2000 to 1300 BCE) in Cagayan Valley in the Philippines.