The Blue Lias and Charmouth Mudstone geological formations are host to a multitude of remains from the Early Jurassic era, a time from which good fossil records are rare. Many remains are well preserved, including complete specimens of important species. Many of the earliest discoveries of dinosaur and other prehistoric reptile remains were made in the area around Lyme Regis, notably those discovered by Mary Anning (1799–1847). Significant finds include "Ichthyosaurus", "Plesiosaurus", "Dimorphodon", "Scelidosaurus" (one of the first armoured dinosaurs) and "Dapedium". The town holds an annual Mary Anning Day and Lyme Regis Fossil Festival. A fossil of the world's largest moth was discovered there in 1966.