Chronozone


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chronozone

[krän·ə‚zōn]
(geology)
A formal time-stratigraphic unit used to specify strata equivalent in time span to a zone in another type of classification, for example, a biostratigraphic zone. Also known as chronostratigraphic zone.
The smallest subdivision of chronostratigraphic units, below stage, composed of rocks formed during a chron of geologic time.

Chronozone

 

the zone of the general stratigraphic scale below the stage. A chronozone may be traced in rock strata of different lithological compositions, where the typical complex of fossil organisms may change considerably. It differs from the biostratigraphic zone, whose paleontological features remain constant. The term “chronozone” was introduced in 1961 by the Norwegian geologist G. Henningsmoen. (SeeSTRATIGRAPHY.)

References in periodicals archive ?
Eichenwalder waren in der subborealen Chronozone auf Saaremaa und dem Festland relativ verbreitet.
To determine the age of the sediments and the chronozone configuration in the deposit, radiocarbon ([sup.
14]C age were the main reasons why in the 1960s and 1970s the Ancylus transgression was correlated with the Boreal chronozone (Kessel & Punning 1969a; Kessel & Raukas 1979).
The AMS date (9620 [+ or -] 65 cal yr BP) from the organic-rich bed close to the calcareous gyttja lower limit corresponds to the Boreal chronozone and macroremains at 520 cm showed an age of 8400 cal yr BP (Table 2).
Lake Juusa pollen profile JU2 can be correlated with the Pre-Boreal Chronozone because of the decrease in the NAP pollen percentage and dominance of Betula in this zone.
Bitinas (2004) has determined that aeolian processes in Lithuania started already in the late glacial and ended approximately 6000 years ago, that is in the second half of the Atlantic chronozone.
He established that the organic sediments started to accumulate not earlier than in the middle of the Atlantic chronozone, between 5500 and 5000 BP.
According to interpretation of pollen diagrams, the retreat of the ice margin from the Haanja zone began in the Belling period and the area of Estonia was finally ice-free in the second half of the Allered chronozone (Pirrus & Raukas 1996).
3] was higher (60-65%) than at the end of the Chronozone (45-50%).