Plasticrusts are a new type of plastic pollution in the form of plastic debris, covering rocks in intertidal shorelines which vary in thickness and in color and are composed of polyethylene based on fourier-transform infrared spectroscopy (FTIR) analysis. They were first discovered on the South coast of the volcanic island of Madeira in the Atlantic Ocean in 2016 and have additionally been found on Giglio Island, Italy. They are considered a sub-type of plastiglomerate and could possibly have negative effects on surrounding fauna by entering the food web through consumption by benthic invertebrates.