Fulgurites can exceed 20 centimeters in diameter and can penetrate deep into the subsoil, sometimes occurring as far as below the surface that was struck. Or they may form directly on sedimentary surfaces. One of the longest fulgurites to have been found in modern times was a little over in length, and was found in northern Florida. The Yale University Peabody Museum of Natural History displays one of the longest known preserved fulgurites, approximately in length. Charles Darwin in "The Voyage of the Beagle" recorded that tubes such as these found in Drigg, Cumberland, UK reached a length of . The Winans Lake fulgurite[s (Winans Lake, Livingston County, Michigan), extended discontinuously throughout a 30 m range, and arguably includes the largest reported fulgurite mass ever recovered and described: its largest section extending approximately 16 ft (4.88 m) in length by 1 ft in diameter (30 cm).