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Cambrian
90
Earth sciences & physical geography
90
Physical
90
Physique
90
Sciences de la terre & géographie physique
90
chemical
90
chimie
90
mathematical & earth Sciences
90
mathématiques & sciences de la terre
90
periglacial morphologies
90
Ordovician
85
Stavelot-Venn Massif
85
Caledonian
70
Tertiary
60
Hercynian
55
Permian
55
Radon
55
Rn
55
Wallonia (Belgium)
55
geological mapping
55
unconformities
55
Quaternary
50
Cretaceous
45
landslides
45
Lower Devonian
40
Devonian
30
LIDAR
30
Silurian
30
active faults
30
graben
30
lithalsas
30
Graben
25
active fauts
25
Belgium (Eastern Wallonia)
15
Belgium (Wallonia)
15
LIDaR
15
Variscan (Rheno-hercynian zone)
15
geological map
15
geological mappin
15
Silurian (top)
10
active landslides
10
Eastern Belgium
5
Lidar prospection
5
lithalses
5