Īfter a very detailed examination of the Bimini Road and the other linear features, Gifford and Ball made the following observations: Given the degree to which 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. 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. The blocks consist of limestone composed of carbonate-cemented shell hash that is called " beachrock".
Having rounded corners, the blocks composing these pavements resemble giant loaves of bread. The two narrower and shorter, approximately 50 and 60 m (160 and 200 ft)-long linear features lying shoreward of the Bimini Road consist of smaller tabular stone blocks that are only 1–2 m (3–7 ft) in maximum horizontal breadth. The larger blocks show complementary edges, which are lacking in the smaller blocks. It consists of stone blocks measuring as much as 3-4 metres (9-12 feet) in horizontal dimensions, with the average size being 2-3 metres (6-9 feet). 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. Descriptions of the Bimini Road found in various books and articles greatly exaggerate the regularity and rectangularity of the blocks composing these features. The Bimini Wall and two linear features lying shoreward of it are composed of flat-lying, tabular, and roughly rectangular, polygonal, and irregular blocks. Two similar linear features lie parallel to and shoreward of the Bimini Wall. These stones form a northeast-southwest linear feature, which is now commonly known as either the "Bimini Road" or "Bimini Wall". On September 2, 1968, while diving in three fathoms (5.5 metres or 18 feet) of water off the northwest coast of North Bimini island, Joseph Manson Valentine, Jacques Mayol and Robert Angove encountered what they called a "pavement" of what later was found to be noticeably rounded stones of varying size and thickness.
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