fucoid

Etymology
.

Adjective

 * 1) Resembling or relating to seaweeds of the genus.
 * 2) Of sandstone: bearing seaweed-like markings.
 * 3) * Calcareous siltstone, Cambrian Fucoid Beds, earth.ox.ac.uk webpage
 * The Fucoid beds are quite variable in appearance in composition The rock unit got its name from the early belief that these markings were the compressed remains of seaweeds (fucoids). Now it is thought that they are the trails left by feeding creatures on the sea floor.
 * The Fucoid beds are quite variable in appearance in composition The rock unit got its name from the early belief that these markings were the compressed remains of seaweeds (fucoids). Now it is thought that they are the trails left by feeding creatures on the sea floor.

Noun

 * 1) A fucoid seaweed.