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An iceberg scour is a long incision or depression formed when a grounded iceberg keel moves across the seabed. To distinguish one from another seafloor groove, look for several clues together: a linear or curving track, disturbed margins such as berms or push-up ridges, a possible pit at the track’s end, and a spatial pattern that does not follow a canyon or gully. No single clue proves the origin; the surrounding landforms, seabed data and survey quality all matter.
What an iceberg scour looks like
Iceberg scours, also called iceberg ploughmarks, are elongated grooves or depressions cut into seafloor sediment by an iceberg keel grounding and travelling across it. In a bathymetric map, a scour may appear straight, gently curved or slightly sinuous. Tracks can cross one another, providing clues about which feature formed later.
Examine the feature as a landform, not just as a line on a map. Its cross-section, margins, endpoints and relationship to nearby features can all help distinguish keel ploughing from other causes of seabed disturbance.
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Track shape and continuity
A long, continuous incision with a linear to curving course is consistent with an iceberg keel dragging across the bottom. A groove that follows a larger channel or aligns with regional drainage may have another explanation, so trace it beyond the immediate area before interpreting it.
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Raised margins and disturbed sediment
Lateral berms or push-up ridges alongside a trough support an interpretation in which a keel displaced seabed material. Some troughs have flat bottoms, and well-preserved examples may retain finer ridge-and-groove texture. How clearly these details remain visible depends on preservation and later seabed reworking.
Grounding pits and paired tracks
A pit at the end of a groove can indicate where a keel grounded or stopped. It strengthens the case for iceberg scour when it occurs with other supporting features, but its absence does not rule one out. Occasional parallel paired grooves have been interpreted as tracks from double-keeled icebergs; they are supporting evidence, not a requirement.
Distribution and regional setting
In a 2012 study of Rockall Bank in the northeast Atlantic, Sacchetti, Benetti, Ó Cofaigh and Georgiopoulou described scours as relatively randomly distributed and normally unconnected to regional features such as canyons or gullies. Their interpretation also considered terminal grounding pits, lateral berms, push-up ridges and occasional paired tracks. These are useful clues in combination, not universal proof that any groove with one of those characteristics was made by an iceberg.
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How to distinguish scours from other seabed disturbances
Compare competing explanations against the same evidence rather than deciding from the groove alone. A candidate that is isolated, gently curving and bordered by sediment ridges is more consistent with iceberg keel interaction than one that forms part of a canyon or gully system. Still, the available evidence does not establish a complete checklist for every natural or human-made disturbance, so local geology and morphology remain important.
| What to compare | What supports iceberg scour | What calls for closer examination |
|---|---|---|
| Planform and continuity | A distinct elongated track, linear to curving, that can be traced across the seabed. | A groove that appears to continue into or follow a larger regional channel. |
| Margins and endpoints | Lateral berms or push-up ridges, with a grounding pit at the end if preserved. | No clear associated relief, or morphology that fits another nearby landform; absence of a pit alone is not decisive. |
| Spatial pattern | Tracks distributed across an area without an obvious connection to canyons or gullies. | Alignment or connection with regional drainage features. |
| Neighboring landforms and strata | A groove whose shape and setting fit keel interaction with the seabed. | Nearby glacial landforms, tidal ridges or sediment deformation that could complicate the interpretation. |
| Data quality | Clear relief in suitably resolved, adequately covered mapping. | Coarse, incomplete or artifact-prone coverage that may hide or mimic subtle morphology. |
Other glacial features may occur in the same region without being iceberg scours. High-resolution acoustic surveys have mapped ploughmarks alongside mega-scale glacial lineations and grounding-zone wedges, which are distinct landform classes and should be assessed by their own geometry and setting. Tidal ridges and sediment deformation can also complicate interpretation; neighboring features and shallow stratigraphy can help provide context.
Which seafloor data can help
Multibeam bathymetry for relief and planform
A multibeam echo sounder maps depth across a swath, giving a broader view of seafloor relief than a single depth trace along a ship’s path. Inspect both shaded-relief imagery and the underlying bathymetric grid at a resolution appropriate to the feature. Higher-resolution grids can reveal subtle morphology, but swath-edge artifacts may also become more apparent.
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Side-scan sonar for seabed texture
Side-scan sonar provides acoustic imagery that can reveal seabed texture and relief. It complements bathymetry rather than replacing it: together, the datasets can show both the shape of a groove and how its surface differs from the surroundings.
Sub-bottom profiles for shallow structure
A sub-bottom profiler helps examine how a feature is expressed beneath the seabed surface. This can help distinguish surface morphology from shallow subsurface structure and place the groove in its sedimentary context.
Combined acoustic surveys
An Antarctic Peninsula study used an autonomous underwater vehicle (AUV) carrying multibeam echo sounding, side-scan sonar, sub-bottom profiling and high-resolution synthetic aperture sonar. It reported imaging some glacial landforms at horizontal resolutions of a few tens of centimetres. That result applies to the study’s survey system; it should not be assumed for all AUV or sonar datasets.
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Interpret visibility in light of the survey conditions. Resolution, grid selection, sound-velocity correction, coverage, sediment type and preservation all affect what can be seen. A feature missing from coarse or incomplete data may simply be unresolved.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What dimensions can—and cannot—tell you
Published measurements vary with setting and should not be treated as universal thresholds for identifying a scour.
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|---|---|---|
| Average depth of 1–2 m and width of about 30–40 m | Continental Shelf Research authors, 1991; Labrador continental shelf. | A regional average, not a cutoff for other sites. |
| Typical widths from tens of metres to 100 m and depths of 1–10 m | Geomorphology authors, 2012; Rockall Bank, where the paper also describes much larger or deeper local examples. | A description of that study’s setting, not a universal size range. |
| Keel depth up to 500 m and incisions up to 15 m deep | Sacchetti and colleagues, 2012; an interpretation of isolated Rockall Bank marks under the paper’s stated full-glacial sea-level assumption. | A regional inference tied to its assumptions, not a general measurement of iceberg scours. |
Relative age and the limits of visual evidence
Where grooves cross, the intersecting relationship can indicate which one likely formed later. Differences in preservation—for example, one track appearing smoother or more degraded—can support a relative comparison, but appearance alone does not establish an absolute age.
Scour populations may reflect different iceberg sources, water depths, seabed substrates or glacial episodes. These are broader interpretations, not conclusions that can be drawn from one groove’s shape alone. A 2021 study of the northeastern Baltic Sea, west of Estonia, interpreted two scour populations and proposed a likely formation interval of 13,800–12,300 years BP for that study area. Those dates are specific to the study’s geographic and interpretive context.
Quick Recap
A practical interpretation checklist
- Map the whole feature. Trace its planform and continuity, and check whether it crosses other tracks or connects to a canyon, gully or larger regional feature.
- Inspect its relief. Look for lateral berms, push-up ridges, a flat-bottomed trough, finer ridge-and-groove texture or a terminal pit.
- Check for related tracks. Note parallel paired grooves if present, but do not require them.
- Compare the surroundings. Consider nearby glacial landforms, tidal ridges, sediment deformation and the shallow stratigraphy.
- Review the survey limits. Confirm that resolution and coverage are adequate, and account for grid choice, sound-velocity correction and possible artifacts.
- State the conclusion at the right strength. Describe the features that support an iceberg-scour interpretation and any unresolved alternatives; do not present a single clue or visual age difference as proof.
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