Contribution to the Macrophytic Typology of Belgian Reference Watercourses

Table 2

The four natural regions studied (age, stratigraphy, and nature of the deposits).

	System	Stage	Nature of deposits	Natural region	Sites
Geology 1; (primary)	Cambrian	Revinian; Devillian	Quartzites; Quartzphyllite	Arden	26-27, 30–32, 36
	Ordovician	Salmian	Phyllite
Geology 2; (primary)	Eodevonian	Gedinian	Quartzites; Phyllite; Shale; Sandstone puddingstone; Arkose	Arden	22, 8, 33, 35, 37-38
Geology 3; (primary)	Eodevonian	Siegenian; (Coblencian)	Quartzphyllite; Phyllite; Psammites; Sandstone	Arden	29, 39–50
Geology 4; (primary)	Eodevonian	Emsian; (lower and upper)	Quartzite; Shale; Sandstone	Arden	34
Geology 5; (primary)	Devonian	Frasnian; Givetian; Famennian	Nodular shale; Psammites; Limestone	Famenne and; Condroz	1–12, 20, 23–25
	Carboniferous	Tournaisian; Visean	Macigno; Limestone
Geology 6; (primary)	Jurassic	Virtonian; Sinemurian; Toarcian; Bajocian	Sand; Sandy limestone; Marl; Limestone	Lorraine	13–19, 21
	Triassic	Keuperian; Hettangian	Marl