One pivotal period of civilizations embryonic stages was the Ubaid period - which spanned 6500 - 3800 BC, roughly 8500 years till 5800 years ago.
The name Ubaid is derived from an archaeological site where a large amount of material from the period was excavated - Tell al-`Ubaid. Among the artifacts unearthed were what has come to be known as the Ubaid Lizardmen. They are humanoid figures with reptilian characteristics.
The actual definitive genesis of the Ubaidian civilization is a mystery. They are known to have lived in villages scattered about the region. They were acquainted with basic architecture, they paved their streets and built admirable structures - considering the time period in which they existed.
They were also accomplished in the agricultural sciences. They were perhaps the first to use a relatively advanced irrigation system. Some of the larger buildings and temples they created became focal points of the later Sumerian civilization.
The Al'Ubaid site was first excavated in 1919 by Harry Reginald Hal whose team discovered both Male and female lizardman figurines in varying postures. Nearly all the figurines appear to be wearing helmets and shoulder padding. Some of the figures are holding scepters. Female figures are depicted holding infants that appear to be suckling milk. Suckling is a mammalian trait - reptiles do not suckle or produce milk. Both the parent and child figurines are reptilian - lizard like.
The figurines do not appear to have been of any ritualistic significance, but do however appear to have been important to their creators.
Ancient Alien theorists have speculated that perhaps theses lizardman figurines depict an ancient race of star people who came to Earth in the Ubaidian Era. Nay Sayers point out that the Ubaid civilization practiced skull modification whereby the skull was manipulated from infancy to deform to an oblong shape.
This would explain the head shapes. The almond-shaped oval eyes are a common primitive stylistic rendering of Asiatic features, and less pronounced examples have earlier been found around the region. But why the two features were merged together on one genre of sculpture is a mystery in of itself.
The Ubaid themselves were not Asiatic, had they been there would have been a more realistic depiction of the eyes - which is evidenced by ancient oriental art.
Artifacts of Lizard-like creatures have been found in the in the middle east and many other ancient civilizations spanning the globe. See: The Reptilian Race