Changes

The Landsat and SLAR images of exposed Precambrian crystalline crust ([[:file:using-magnetics-in-petroleum-exploration_fig14-4.png|Figure 1]] show highly lineated terrains and demonstrate that the linears fall into multiple parallel or subparallel sets of varying strike directions. These overlapping fracture sets cut the basement into blocks of varying shapes and sizes. This collection of basement blocks is the '''basement fault block pattern'''.

The Landsat and SLAR images of exposed Precambrian crystalline crust ([[:file:using-magnetics-in-petroleum-exploration_fig14-4.png|Figure 1]] show highly lineated terrains and demonstrate that the linears fall into multiple parallel or subparallel sets of varying strike directions. These overlapping fracture sets cut the basement into blocks of varying shapes and sizes. This collection of basement blocks is the '''basement fault block pattern'''.

==Precambrian surface topography==

==Precambrian surface topography==

The intensity of fracturing and mylonitization of the rocks in shear zones explains why these zones generally erode low and why they tend to control the topography of the Pre-Cambrian surface. This surface, in turn, controls much of the structure in the lower part of the sedimentary section through gravitational compaction of the sedimentary rocks.

The intensity of fracturing and mylonitization of the rocks in shear zones explains why these zones generally erode low and why they tend to control the topography of the Pre-Cambrian surface. This surface, in turn, controls much of the structure in the lower part of the sedimentary section through gravitational compaction of the sedimentary rocks.

==Canadian Shield example==

==Canadian Shield example==