1. of, relating to, or resembling seaweed or kelp, especially of the genus Fucus
Usage: technical; geology/paleontology
2. containing or marked by fossilized seaweed or algal impressions
Usage: geology; paleontology

Examples

• The fucoidal deposits in the rock layer indicated ancient marine conditions.
• Geologists identified fucoidal markings on the fossil surface.
• The fucoidal sediments suggested the presence of shallow coastal waters millions of years ago.
• Fucoidal impressions are commonly found in Paleozoic strata.
• The specimen displayed characteristic fucoidal patterns typical of kelp fossils.