an elaborate overview of the sequence of migrations. The oldest attested Indo-European language is Hittite, which belongs to the oldest written Indo-European languages, the Anatolian branch. Although the Hittites are placed in the 2nd millennium BCE, the Anatolian branch seems to predate Proto-Indo-European, and may have developed from an older Pre-Proto-Indo-European ancestor. If it separated from Proto-Indo-European, it is likely to have done so between 4500 and 3500 BCE. A migration of archaic Proto-Indo-European speaking steppe herders into the lower Danube valley took place about 4200–4000 BCE, either causing or taking advantage of the collapse of Old Europe. According to Mallory and Adams, migrations southward founded the Maykop culture (c. 3500–2500 BCE), and eastward the Afanasevo culture (c. 3500–2500 BCE), which developed into the Tocharians (c. 3700–3300 BCE). According to Anthony, between 3100 and 2800/2600 BCE, a real folk migration of Proto-Indo-European speakers from the Yamna-culture took place toward the west, into the Danube Valley. These migrations probably split off Pre-Italic, Pre-Celtic and Pre-Germanic from Proto-Indo-European. According to Anthony, this was followed by a movement north, which split away Baltic-Slavic c. 2800 BCE. Pre-Armenian split off at the same time. According to Parpola, this migration is related to the appearance of Indo-European speakers from Europe in Anatolia, and the appearance of Hittite. The Corded Ware culture in Middle Europe ( 2900–2450/2350 cal. BCE), has been associated with some of the languages in the Indo-European family. According to Haak et al. (2015) a massive migration took place from the Eurasian steppes to Central Europe. This migration is closely associated with the Corded Ware culture. The Indo-Iranian language and culture emerged in the Sintashta culture (c. 2050–1900 BCE), where the chariot was invented. Allentoft et al. (2015) found close autosomal genetic relationship between peoples of Corded Ware culture and Sintashta culture, which "suggests similar genetic sources of the two", and may imply that "the Sintashta derives directly from an eastward migration of Corded Ware peoples". The Indo-Iranian language and culture was further developed in the Andronovo culture (c. 2000–1450 BCE), and influenced by the Bactria–Margiana Archaeological Complex (c. 2250–1700 BCE). The Indo-Aryans split off sometime around 2000–1600 BCE from the Iranians, after which Indo-Aryan groups are thought to have moved to the Levant (Mitanni), the northern Indian subcontinent (Vedic people, c. 1500 BCE), and China (Wusun). Thereafter the Iranians migrated into Iran. Central Asia: formation of Indo-Iranians Indo-Iranian peoples are a grouping