Abstract
In tropical and subtropical waters, several genera of marine Gastropods belonging to the family vermetidae may, under certain circumstances, build conspicuous benches or corniches on the littoral zone of rocky coasts that are subject to moderate or heavy surf action. These formations always grow at a constant level in the biological zonation, which is the upper limit of the infralittoral zone (Peres & Picard, 1964) or the lower limit of the midlittoral zone (Stephenson & Stephenson, 1949). As this level, according to the distribution of intertidal organisms (and not by any tidal reference), is the height at which periodic emergence at low tide (or in the trough between two waves) is of minor significance as an ecological factor, it may be accepted as a biological zero level (even though it does not correspond exactly to the ‘mean sea level’ as defined by hydrographers).
The shape and size of vermetid formations is subject to variations, according to the nature of the substratum and the relative and absolute importance of tide and surf.
Vermetid formations fossilize easily when raised above their normal growth level, provided they are protected from rain and the humic acids of the soil. When submerged, their preservation is generally not so good due to biological erosion.
The measurement of the height of an elevated vermetid-zone remain must be made, whenever possible, in relation to the summit of the living Vermetids of the present shore in the same place. In tideless seas, and especially when Vermetid lines depend upon erosional features such as notches or marine platforms, they constitute almost ideal sea-level indicators with a range of error as small as ±0.1 m. In less favourable conditions (strong surf and tide, absence of erosion notch), their interpretation may be more difficult, requiring a thorough survey of present zonation and environmental conditions, but they are still quite useful even if the range of error reaches ±0.5 m or even ±1 m in some cases.
Vermetid shells are wholly aragonitic, and are therefore little prone to contamination and are easily dated by 14C techniques, which makes them all the more desirable as sea-level indicators.
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Laborel, J. (1986). Vermetid gastropods as sea-level indicators. In: van de Plassche, O. (eds) Sea-Level Research. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-4215-8_10
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DOI: https://doi.org/10.1007/978-94-009-4215-8_10
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