The Bimini Wall and two linear features lying shoreward of it are composed of flat-lying, tabular, and rectangular, subrectangular, polygonal, and irregular blocks. Descriptions of the Bimini Road found in various books and articles greatly exaggerate the regularity and rectangularity of the blocks composing these features.[5] The Bimini Road, the largest of three linear features, is 0.8 km (0.50 mi) long, a northeast/southwest-trending feature with a pronounced hook at its southwest end. It consists of stone blocks measuring as much as 3 to 4 meters (9 to 13 feet) in horizontal dimensions, with the average size being 2 to 3 meters (6 to 9 feet). The larger blocks show complementary edges, which are lacking in the smaller blocks. The two narrower and shorter, approximately 50 and 60 meters (164 and 197 feet)-long linear features lying shoreward of the Bimini Road consist of smaller tabular stone blocks that are only 1 to 2 meters (3 to 6 feet) in maximum horizontal breadth. Having rounded corners, the blocks composing these pavements resemble giant loaves of bread. The blocks consist of limestone composed of carbonate-cemented shell hash that is called "beachrock". Beachrock is native to the Bahamas. The highly rounded nature of the blocks forming the Bimini Road indicates that a significant thickness of their original surface has been removed by biological, physical, and chemical processes. Given the degree that these blocks have been eroded, it is highly implausible that any original surface features, including any tool marks and inscriptions, would have survived this degree of erosion