chronozonen.
/ˈkrɒnəzəʊn/, /ˈkrəʊnəzəʊn/, U.S. /ˈkrɑnəˌzoʊn/, /ˈkroʊnəˌzoʊn/ Geology.
A sequence of rock layers formed during a single (specified) time interval, typically begun and ended by distinct events. Also: such an interval (cf. chron n.).
ΚΠ
1960 H. D. Hedberg et al. in Rep. 21st Internat. Geol. Congr. xxv. 23 The expression ‘chronostratigraphic zone’ has been conveniently shortened to chronozone... The chronozone of the type Wellington Formation is the body of strata of the same age on the time-span as the type section of the Wellington Formation.
1989 Nature 7 Dec. 639/1 The rate of sea level rise was at a minimum at 11,000 yr BP, marking the beginning of the Younger Dryas chronozone, and remained low until 10,500 yr BP.
1993 E. N. K. Clarkson Invertebr. Palaeontol. & Evol. (ed. 3) i. 25/2 There are relatively few well established chronozones or ‘world instants’ as they have been called, and so ‘chronozone’, though it has a real meaning, is not a term applicable to most practical stratigraphy.
2009 Proc. National Acad. Sci. U.S.A. 109 6835/1 G[loborotalia] menardii exhibits drastic and near-synchronous changes in abundances at the scale of this ocean realm throughout the Brunhes and Matuyama chronozones.
This is a new entry (OED Third Edition, September 2017; most recently modified version published online March 2022).
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n.1960