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A geologic map or geological map is a special-purpose map made to show various geological features. Rock units or geologic strata are shown by color or symbols. Bedding planes and structural features such as faults , folds , are shown with strike and dip or trend and plunge symbols which give three-dimensional orientations features.
An example cross section of an anticline with a dike cutting through, with the map of its surface expression showing strike and dip information. Cross sections are made by interpreting and extrapolating a broad range of information about a region's geological characteristics. This can include data from the surface, subsurface, and existing ...
Print/export Download as PDF; Printable version; In other projects ... Pages in category "Geologic maps" The following 13 pages are in this category, out of 13 total.
Example of the application of identifying geological structures and rock contacts using aerial photographs. The black dash lines refer to some local faults which are determined according to the photo-lineaments. The yellow area is the deposits. The pale blue area is volcanic rock. The blue area (bottom right) is rhyolite. The pink area is granite.
Only a few of the largest large igneous provinces appear (coloured dark purple) on this geologic map, which depicts crustal geologic provinces as seen in seismic refraction data. A large igneous province ( LIP ) is an extremely large accumulation of igneous rocks , including intrusive ( sills , dikes ) and extrusive ( lava flows, tephra ...
A geological survey is the systematic investigation of the geology beneath a given piece of ground for the purpose of creating a geological map or model.Geological surveying employs techniques from the traditional walk-over survey, studying outcrops and landforms, to intrusive methods, such as hand augering and machine-driven boreholes, to the use of geophysical techniques and remote sensing ...
Isochore maps in geology are also referred to as True Vertical Thickness (TVT) maps. [2] [3] Thus, an isochore and isopach map are the same only when both the top and bottom surfaces of the layer shown are horizontal. When the layer shown is inclined, as is usually the case, the thicknesses displayed in an isochore map of the layer will be ...
Geologic map of Australia, showing a layout with a strict compartmentalized order that clearly directs attention flow. The four thematic inset maps provide visual balance with the main map, which is enlarged to maximize scale and visual hierarchy. Note also the order created by arranging the title and legend consistently in all five maps ...