36
National Geographic Magazine.
Representative Geographic Forms as classified by Genesis.
Genetic Processes. | Geographic Forms. | ||
Category. | Class. | ||
Deformation |
Elevation | Continents, great islands, most mountain ranges, etc., not classified in detail. | |
Depression | Oceans, great seas and bays, some inland valleys and lake-basins, etc., not classified in detail. | ||
Gradation |
Deposition | Newly emerged ocean-bottoms (e. g., portions of the Coastal plain), playas and mountain-bound deserts, many flood-plains, marshes, etc., not classified in detail. | |
Degradation | Drainage-systems and resulting topographic elements which are— 1—Autogenous (not classified in detail); and | ||
Vulcanism |
Extravasation | Volcanic peaks, craters, lava-fields, tufa-crags, sinter-cones, volcanic necks, mesas, dykes, some mineral veins, etc., not classified in detail. | |
(Antithesis of do.) | Sinks, caverns, some fissures, etc., not classified in detail. | ||
Alteration |
Lithifaction | Minor features of certain topographic forms, e. g., reefs, crags, pinnacles, salients, out-cropping veins, some cataracts, etc., not classified in detail. | |
Delithifaction | Minor features of certain topographic forms, e. g., pools and basins, reëntrants, some fissures and caverns, etc., not classified in detail. | ||
Glaciation |
Glacial construction | Drift-plains, moraines of whatever character, drumlins, kames, aasar, drift-dammed lakes, loss-plains and ridges, etc., not classified in detail. | |
Glacial deconstruction | Rock-basins. U-cañons, roches de moutonnées, etc., not classified in detail. | ||
Wind action |
Wind construction | Dunes, sand-ridges, bars, spits, etc., not here classified in detail. | |
Wind deconstruction | Ponds associated with dunes, "blow-outs," "purgatories," etc., not classified in detail. | ||
Vital Action | | | (Not discriminated) |