Importance of Water Ecological Environment Protection in Urban Landscape Design

Table 3

Stratigraphic profile.

Circles	System	Unification	Symbol	Lithology	Age
Freshmen	Quaternary	Holocene	βQ42	Shilong lava	1719–1721 a
			BQ41	Shilong lava	1719–1721 a
		Upper pleistocene	BQ31	Lava	0.17–0.19 Ma
			βQ23	Lava	0.28–0.34 Ma
		Middle pleistocene	BQ22	Lava	0.40–0.57 Ma
			βQ21	Lava	0.70–0.88 Ma
		Lower pleistocene	βQ12	Lava	1.053–1.416 Ma
			βQ11	Lava	2.076 Ma