downdipadj.adv.
/ˈdaʊndɪp/, /daʊnˈdɪp/, U.S. /ˈdaʊnˌdɪp/ Geology.
A. adj.
Situated or occurring in a direction downwards along the dip of a stratum, surface, etc.
ΘΚΠ
the world > the earth > structure of the earth > structural features > fold or dip > [adjective] > others
plagioclinal1879
isoclinal1882
downdip1904
ptygmatic1907
up-dip1916
1904 Geogr. Teacher 2 249 The strike streams have the up-dip slope gentler and higher, the down-dip slope lower and steeper.
1916 F. H. Lahee Field Geol. viii. 191 When a fault is approximately parallel to the strike of the strata, the block on the side of the fault toward which the dip of the beds is measured may be termed the down-dip block, and the other one is the up-dip block.
1984 J. J. Lowe & M. J. C. Walker Reconstructing Quaternary Environments iii. 101 Where the dip of the pebbles has been recorded, orientation measurements are taken in the down-dip direction.
2004 I. Lerche & S. Noeth Econ. Petroleum Production II. 23 A conventional stratigraphic trap has a distinct downdip water level.
B. adv.
In a direction downwards along the dip of a stratum, surface, etc.
ΘΚΠ
the world > the earth > structure of the earth > structural features > fold or dip > [adverb] > others
synclinally1855
downdip1923
ptygmatically1928
isoclinally1936
up-dip1957
1923 Jrnl. Geol. (Chicago) 31 78 The Ivahy..for a portion of its course flows at the eastern foot of the lava escarpment, shifting its channel down dip in accordance with Gilbert's Law.
1972 R. G. Kazmann Mod. Hydrol. (ed. 2) v. 175 The aquifer may pinch out in clay downdip.
2010 Geology 38 999/1 The fluid that cemented the concretions moved downdip, away from the bleached sandstone on the structural high.
This entry has been updated (OED Third Edition, December 2018; most recently modified version published online March 2022).
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adj.adv.1904