Table 1.

The time, Era sequence and Aspect division standard of site culture.

About the era division of the site
Civilized age	Cultural age(Equivalent to)	Time (a, BP)	Chronological order
Paleolithic	Dingcun Culture	40,000–30,000	1
	Middle Pleistocene	30,000–26,000	2
	Late Pleistocene	29,000–27,000	3
	Late Pleistocene	19,000–17,000	4
	Pleistocene	16,000–11,000	5
Neolithic	Mesolithic stage	11,000–8,000	6
	Early Yangshao Culture	7,000–6,000	7
	Late Yangshao Culture	5,500–5,000	8
	Qijia Culture	4,500–4,000	9
	Longshan Culture	4,500–4,000	10
Bronze Age	Yanbulak Culture	4,000–3,000	11
	Xia Shang Culture	4,000–3,000	12
	Western Zhou Dynasty	3,100–2,700	13
	Eastern Zhou Dynasty	2,800–2,200	14
Aspect Standard
Positive degree of aspect	Aspect	Positive degree of aspect	Aspect
338-22°	North	158–202°	South
23–67°	Northeast	203–247°	southwest
68–112°	East	248–292°	West
113–157°	Southeast	293–337°	Northwest