Chronostratigraphic Units A.
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Nature of Chronostratigraphic Units Chronostratigraphic units are bodies of rocks, layered or unlayered, that were formed during a specified interval of here time. The units of geologic time during which chronostratigraphic units were formed are called geochronologic units.
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The relation of chronostratigraphic units to other kinds of stratigraphic units is discussed in Chapter The element of stratigraphy that deals with the relative time relations and ages of rock bodies. Chronostratigraphic classification.
The organization of rocks into units on the basis of their age or time of origin. The a guide to proper dating chapter 9 of chronostratigraphic classification is to organize systematically the rocks forming the Earth's crust into named units chronostratigraphic units corresponding to intervals of geologic time geochronologic units to serve as a basis for time-correlation and a click system for recording events of geologic history.
Chronostratigraphic unit. A body of rocks that includes all rocks formed during a specific interval click here geologic time, and only those rocks formed during that time span. Chronostratigraphic units are bounded by synchronous horizons. The rank and relative magnitude of the units in the chronostratigraphic hierarchy are a function of the length of the time interval that their rocks subtend, rather than of their physical thickness.
Chronostratigraphic horizon Chronohorizon. A stratigraphic surface or interface that is synchronous, everywhere of the same age. Kinds of Chronostratigraphic Units 1. Hierarchy of formal chronostratigraphic and geochronologic unit terms. The Guide recommends the following formal chronostratigraphic terms and geochronologic equivalents to express units of different rank or time scope Table 3.
Position within a chronostratigraphic unit is expressed by adjectives indicative of position such as: The stage has been called the basic working unit of chronostratigraphy because it is suited in scope and rank to the practical needs and purposes of intraregional chronostratigraphic classification.
The stage includes all rocks formed during an age. A stage is normally the lowest ranking unit in the chronostratigraphic hierarchy that can be recognized on a global scale.
It is a subdivision of a series. Boundaries and stratotypes. A stage is defined by its boundary stratotypes, sections that contain a designated point in a stratigraphic sequence of essentially continuous deposition, preferably marine, chosen for its correlation potential.
The selection of the boundaries of the stages of the Standard Global Chronostratigraphic Scale deserves particular emphasis because such boundaries serve to define not only the stages but also chronostratigraphic units of higher rank, such as series and systems. The lower and upper boundary stratotypes of a stage represent specific moments in geologic time, and the time interval between them is the time span of the stage.
Currently recognized stages vary in time span, but most range between 2 and 10 million years. The thickness of the strata in a stage and its duration in time are independent variables of widely varying magnitudes.
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The name of a stage should be derived from a geographic feature in the vicinity of its stratotype or type area. In English, the adjectival form of the geographic term is used with an ending in "ian" or "an". The age takes the same name as the corresponding stage.
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Substage and Superstage A substage is a subdivision of a stage whose equivalent geochronologic term is subage. Adjacent stages may be grouped into a superstage. Names of substages and superstages follow the same rules as those of stages.
The series is a chronostratigraphic unit ranking above a stage and below a system. The geochronologic equivalent of a series is an epoch. The terms superseries and subseries have been used only infrequently.
Boundaries and boundary-stratotypes. Series are defined by boundary stratotypes see section 9. The time span of currently accepted series ranges from 13 to 35 million years. A new series.