Vermetid gastropods as sea-level indicators.

Abstract

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. -from Author