Wednesday, February 7, 2007
Types of landforms; Bornhardt
Africa, Mozambique, Niassa Reserve
General Description: Dome shaped (a.k.a. "domed inselbergs"), massive structures, steep-sided, isolated hills standing above surrounding plains
Shape: Dome shaped, circular in plan but in most cases exhibiting rectilinear plans which are controlled by fracture patterns. Asymmetrical due to internal structure patterns, but some are nearly symmetrical
Height: 30m to 300m
Summit: Pronounced convexity, with curvilinear and sheet jointing. Several cupola like culminations (depressions & holes) present, substantial regolith cover, shallow and broad pans of irregular shape observed
Slope: Near vertical or overhanging sides, slopes are rectilinear and gentle or convex, small tafonis (cave like forms) or overhanging caverns common at base of slope, lower slopes may be convex, constant, or concave
Jointing: Massive & Extensive. Vertical and horizontal jointing, massive curvilinear joints (due to unloading).
Vegetation: Absence, but sparse veg present in tropical regions
Surroundings: An extensive plain, underlain by regolith and alluvium (etchplain/pediplain;depending on formation)
you, 9:17 PM
Africa, Mozambique, Niassa Reserve
General Description: Dome shaped (a.k.a. "domed inselbergs"), massive structures, steep-sided, isolated hills standing above surrounding plains
Shape: Dome shaped, circular in plan but in most cases exhibiting rectilinear plans which are controlled by fracture patterns. Asymmetrical due to internal structure patterns, but some are nearly symmetrical
Height: 30m to 300m
Summit: Pronounced convexity, with curvilinear and sheet jointing. Several cupola like culminations (depressions & holes) present, substantial regolith cover, shallow and broad pans of irregular shape observed
Slope: Near vertical or overhanging sides, slopes are rectilinear and gentle or convex, small tafonis (cave like forms) or overhanging caverns common at base of slope, lower slopes may be convex, constant, or concave
Jointing: Massive & Extensive. Vertical and horizontal jointing, massive curvilinear joints (due to unloading).
Vegetation: Absence, but sparse veg present in tropical regions
Surroundings: An extensive plain, underlain by regolith and alluvium (etchplain/pediplain;depending on formation)
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