axial trough

axial trough

[′ak·sē·əl ′trȯf]
(geology)
Distortion of a fold axis downward into a form similar to a syncline.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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12, 2006, Alvin dove down into what's known as the "axial trough" on the East Pacific Rise--a 100-meter-wide chasm on the ridge's summit with steep cliffs tens of meters high on each side.
Over the next 20 days (bracketing the average 40-day larval lifespan), they sampled within the axial trough north and south of the release point.