This theory has recently been replaced and significantly updated by Juris Zarins who proposes that a Circum Arabian Nomadic Pastoral Complex developed in the period from the climatic crisis of 6,200BCE, partly as a result of an increasing emphasis in PPNB cultures upon animal domesticates, and a fusion with Harifian hunter gatherers in Southern Palestine, with affiliate connections with the cultures of Fayyum and the Eastern Desert of Egypt.