Limpet grazing on Cretaceous algal-bored ammonites

Phosphatized internal moulds of Anahoplites sp. and Euhoplites sp. reveal sets of six-toothed radula marks closely comparable to those scratched on to Recent molluscs by Acmaea (Tectura) virginea in water depths of up to 25 m on the muddy inshore shelf of western Scotland. Both the Recent and Cretaceous acmaeid marks truncate algal borings. Depth of the Gault Sea during the spathi subzone (Middle Albian) was probably between 8 and 30 m, i.e. with the euphotic zone. Subsequent to lithification ad phosphatization the moulds were bored by phoronids and scraped by regular echinoids.