Nautilus comes in various shapes. Some corner stones are straight and called "right angle stones", while others are bent or twisted badly. Cornerstones are relatively large, generally tens of centimeters long, and some right-angled stones even exceed one meter. Nautilus fossils are found all over the world. At present, the earliest nautilus fossils are found in the northeast of China. 1999 10, Nanjing Institute of Geology and Paleontology found three large nautilus fossils in Yichang, Hubei Province, and the longest one was1.62m long. The ancient nautilus fossils discovered this time are called China species and "Sinian hornfels in China", which lived in the Middle Ordovician 460 million years ago. 20 1 1 In September, a 5-year-old British girl found a "big stone" shaped like a snail's shell and covered with thorns in the mud while playing in the Cotswolds Water Park in Loshire, England. Appraised by paleontologist Neville, this is a nautilus fossil, which can be traced back to 65.438+0.6 billion years ago.