chronostratigraphic classification have a common goal.It is the systematic dismemberment of the sequence of layers of the planet on the unit.They have their own names, which correspond to intervals of geologic time.The paper will be discussed in more detail geochronological and stratigraphic scale.They are not only time-based interconnection.Stratigraphic, geochronological scale - it's accepted standards.They are used for registering geological events.
International stratigraphic scale
appearance of this system is an important discovery in the history of mankind.It is the basis of stratigraphy.Methods for obtaining information on the geological history of the Earth's crust have been opened using a planetary scale.ILS is an important element, which is able to solve many geological problems.Without this system, it would be impossible to create many world maps and descriptions of certain large areas, such as tectonic, geological, paleogeographic, paleoclimatic, paleolandscape and many others.
Terminology The term "general stratigraphic scale" was found in the sources in Russian most frequently.Under its meaning is understood the universal nature of the system and the global scope of its application.Stratigraphic scale is a particular sequence of taxonomic units.This system can be considered as a reference absolute geologic period during which was formed by sedimentary shell of the Earth.It represents the ideal complete section of the earth's lithosphere no different floors and omissions.
Scope
This system is widely used as the gauge for individual geological sections.It is also used to determine the relationship of any intervals lithosphere.This set of one or raznovozvratnost.All these elements make the international stratigraphic scale basis for drawing up the chronology of events.This structure is the basis for measuring the recovery of the geological history of the planet.
Standards
collection of elements that includes the stratigraphic scale, is a geological language worldwide.His spelling complies with international agreements.Professional language is one of the many functions of the system.International Geological Congress takes part in setting these standards.Also involved in the process of Geosciences Union.For a long time these structures organize special representative assemblies, in which the ILS introduced further changes.At the last meeting of the International Geological Congress, it was called the scale of geological time.
Division ILS
These items are not materialized paleontological biostratigraphic systems or structures.These units are only a temporary sense, ie chronostratigraphic.For this reason they are not used for the direct separation and interconnection sections.Divisions that includes stratigraphic scale, actually represent only some of the time periods.They, in turn, are presented in the rocks.According to the appearance on the site of a cut of a particular trait are fixed boundaries.This is best accomplished under suitable conditions.Symptom isochronous be desirable from a chemical or physical nature.
modern realities
Currently there is the option of the international stratigraphic scale, which is predominantly based on the regional divisions.In particular, Western system.It has its own historical and geological character.Stratigraphic scale with natural tiers shows the stages of development of certain areas of the Earth's surface, and biota that inhabited it.This is not to deny the obvious - the historical and geological principle really works successfully.However, its use is extremely effective in any one region or sedimentary basin.Use of this point in the development of the international stratigraphic scale is not possible.This is due to the fact that the stages of development of different areas are often not similar in duration period.Nevertheless, they are synchronized in a certain way because of the impact of global factors.
main trend
Output linear scale of geological time in years made by the conjunction of many elements.It is necessary to use all of the factors and events dating from the global and regional scales.We also need other stratigraphic elements.
Obstacles to the completion of the ILS
Interagency Strategic Committee of Russia harshly criticized the latest development of the system.The fact that the domestic organization decided in future to follow the geological traditions.Russian Committee rejects the use of strategic international scale is in the form in which it operates today.This is due to the peculiarities of its slots, terminology and nomenclature.All of these elements from the practical point of view contrary to that contains general stratigraphic scale of Russia.In addition, they have an insufficient argument.Official subjective reasons which impede the completion of the international stratigraphic scale, is the belief of many Russian geologists.They believe that the ILS should be possible to reflect the geological history of the planet.This conviction recorded in the corresponding Code of the Russian Federation.Thus, the stratigraphic scale is a separate system of Russia today.
Additional information about ILS
in international strategic reference reflected the totality of the data on other key aspects of the system: the principles, definitions, concepts, categories, which includes the stratigraphic scale, procedures, and so on.The system consists mainly of standard units that are dated in years.Their breakdown is based on a study of the schematic arrangement of rocks.The system combines two different types of scales: chronostratigraphic and time keeping.Origin currently perceived as a structure measuring schematic arrangement of rocks with standard portions, selected Stratotype boundaries.The second type is based on the units of duration.For example, in years, while a second standard.
main tasks of
first objective pursued by the stratigraphic scale is to identify local time relations.Of great importance for geology of the area has the installation of the relative age of the layers.These aspects are not dependent on any schemes chronostratigraphic units of a global nature.Secondly, the need to develop a standard scale.It is necessary to establish a comprehensive systematic ordering of certain chronostratigraphic elements.They have their own names and are used in regional and global scales.It is expected that this hierarchy will be the basis of the standard.It should determine the age of rock layers, and to match them with the history of the planet.The ideal option is considered, in which the standard scale will fill the entire sequence without any gaps and overlaps.
chronostratigraphic classification
This system is an organization of rocks in the division.It is based on criteria such as age and time of formation.The main aim of the organization is rocks that form the Earth's crust, in certain units.They, in turn, have their own names, which correspond to intervals geological period.These elements are the foundation of the relationship and the time of registering the history of geological events.
Division
This item is a set of all the layers of rock, which are combined together in a certain basis.In particular, the value of their formation during the single interval.The division includes only rocks that were formed in a period of history of the planet.These elements are limited isochronous surfaces.Their relative size and grades set the length of time period that they reflect.To compile chronostratigraphic hierarchy does not need the power of deposits, which are part of the units.
Other terms
Many references designation units of various ranks and temporary volumes by using the following elements.
chronostratigraphic complex includes the following terms:
- tier.
- Eonotema.
- system.
- Series.
- erathem.
- substage.
Geochronological equivalents:
- Century.
- Eon.
- period.
- Era.
- era.
- Podvek.
types of adjectives, indicating the position of the object within the chronostratigraphic:
- top.
- Lower.
- average.
- Basal.
types of adjectives related to geochronological unit:
- later.
- early.
- average.
