Skolithos are a type of trace fossil left behind by worms, insect larvae and other small invertebrates. These burrows run parallel to each other and are unbranched, straight, or curved dwelling burrows. These burrows have a structureless infill pattern with smooth walls consisting of fine-grained sands. The earliest record of skolithos are from the Precambrian period and they are still found today. Skolithos are found in marine and terrestrial environments but are usually formed in high energy marine environments like nearshore marine facies. This is indicated by very-fine grained, thin consistent layers of sedimentation. These trace fossils range in size up to 35cm deep and 5cm in diameter and are used as a means of dwelling, feeding and predation.