Research Article
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 |
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