A Geological Map Briefly Explained

30 Jul

Geological maps are not the ordinary ones seen in different places. It does not show roads, landmarks and traffic. In fact, one can only see different kinds of colors, or lines with different angles. This map is obviously made for a specific purpose. As it is termed by itself, this map is used for geological purposes.  Geology, or the study of the earth’s physical structure, is an important aspect of science in order to see the history out of a sediment, or determine a threat to a certain location. To better recognize the importance of a geological map , here is a brief basic explanations of it:

The map has four distinct features: the explanation of rock sediments, the cross section view, symbols and the map itself. Every feature is important to get a specific kind of geological information. The map itself is self-explanatory. It is where the information is laid out in one piece. The symbols are the indicators of a rock sediment. The symbols usually are arranged in sequence. The oldest ones are placed at the bottom and the youngest are at the top. This is to easily provide an information of the age without the geologist looking at it at for long.

The cross-sections are used to see the earth at a different angle. When a certain map presents the cross-section of a certain location, it means that it is viewed sideways. Viewing the earth at this point is also important to actually see the thickness of the rock layers. It also determines the pattern of the earth and gauge the age of it. In a more practical sense, this cross-section view also can determine different faults or folds. This means that the geologists can determine if a particular location is in danger of damage when an earthquake or other natural calamities occur.

The explanation of the rock sediments is usually provided on a separate sheet or booklet. It is a textual representation of the earth, with specific descriptions of the rock units. This is an essential information that the geologists need in order to learn how the age of rocks are determined, and what the rock is composed of. The detailed explanation requires too many spaces so it cannot be added to the map itself.

Other information that can be seen in the geological map is the shorelines, borders and many others. These usually are assigned with different colors to easier recognition.  The creation of this map is extensive. Experts spend many years to develop this map and it took more another year to develop it as what we see today. The lines also have different meanings. The dash lines indicate that a bedrock is not located. A fault is also determining with a line. Usually a normal fault line is solid with few marks of vertical lines on it. Other lines are the thrust fault, probable fault, strike-slip fault and many others. All these have a specific indication that can be determined by experts, even by the common people.


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