Table 3. Consolidated parent materials: igneous rock types 
Tex lure 
Color 
Light (acidic) Dark (basic) 
Essential Minerals 
Quartz, 
Orthoclase 
Orthoclase 
Quartz, 
Plagioclase 
Plagioclase 
Plagioclase 
Olivine 
Plutonic 
Very coarse 
grained 
Pegmatite 
Syenite 
Pegmatite 
Quartz-diorite 
Pegmatite 
Diorite 
Pegmatite 
Gabbro 
Pegmatite 
Coarse to medium 
grained 
Granite 
Syenite 
Grano-diorite ; 
Quartz Diorite 
Diorite 
Gabbro 
Periodite 
Fine grained 
Aplite Diabase 
Volcanic 
Medium to fine 
grained 
Felsite 
Basalt 
Rhyolite 
Trachyte 
Dacite 
Andesite 
Glassy 
Obsidian; Pumice 
Table 6. Unconsolidated parent materials: drift types 
Texture 
Size 
Alluvial 
Eolian 
Estuarine 
Fluvial 
Glacial 
Gravitational 
Lacustral 
Littoral 
Marine 
Coarse 
Gravelly 
Alluvial 
drift 
Estuarine 
drift 
Fluvial 
drift 
Glacial drift 
(Outwash) 
Gravitational 
drift (Talus) 
Littoral 
drift 
Sandy 
Alluvial drift 
(Alluvium) 
Eolian drift 
(Loess) 
Estuarine 
drift 
Fluvial 
drift 
Glacial drift 
(Outwash) 
Gravitational 
drift (Colluvium) 
Lacustrine 
drift 
Littoral 
drift 
Marine 
drift 
Silty 
Alluvial drift 
(Alluvium) 
Eolian drift 
(Loess) 
Estuarine 
drift 
Fluvial 
drift 
Glacial 
drift (Till) 
Gravitational 
drift (Colluvium) 
Lacustrine 
drift 
Littoral 
drift 
Marine 
drift 
Fine 
Clayey 
Alluvial drift 
(Alluvium) 
Eolian drift 
(Loess) 
Estuarine 
drift 
Fluvial 
drift 
Glacial 
drift (Till) 
Gravitational 
drift (Colluvium) 
Lacustrine 
drift 
Littoral 
drift 
Marine 
drift 
Organic 
Peat 
Muck 
Organic Silt 
Organic Clay 
Cumulose 
drift 
Cumulose 
drift 
Cumulose 
drift 
Cumulose 
drift 
Cumulose 
drift 
Cumulose 
drift 
Cumulose 
drift 
Cumulose 
drift 
Cumulose 
drift 
470 symposium photo interpretation, delft 1962