superchronn.
/ˈs(j)uːpəkrɒn/, U.S. /ˈsupərˌkrɑn/ Geology.
A time interval (chron) lasting more than ten million years between events, esp. reversals of the polarity of the earth's magnetic field. Cf. subchron n.
ΚΠ
1979 Geology 7 581/2 Degrees of rank for chrons, if necessary, can be formed by the prefixes sub- and super-.]
1979 Geology 7 582/1 (table) Polarity superzone. Chron (or superchron).
1986 Science 21 Mar. 1425/2 The 101- to 95-Ma interval is entirely contained within the Cretaceous normal polarity superchron.
2015 P. B. Wignall Worst of Times ii. 19 The Emeishan eruptions began not long (in geological terms) after the superchron ended, thus providing a useful datum.
This is a new entry (OED Third Edition, September 2017; most recently modified version published online March 2022).
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n.1979- to put etc out of heart
- to put etc out of the gate
- to put etc the béal bocht
- to put etc the mask
- to put every iron in the fire
- to put fair
- to put fire to flax
- to put fire to tow
- to put first things first
- to put food on the table
- to put foot
- to put footing
- to put for farm
- to put for it
- to put formerly also lay a dog on the scent
- to put formerly also lay on the scent
- to put forth
- to put forth in press
- to put forward
- to put full nelson on
- to put full nelson on someone
- to put get into one's gears
- to put ginger
- to put gold-weight
- to put goldweight