Tarmac Group centenary in 1953, Tarmac was processing over two million tons of slag a year, its road surfacing had developed into a significant civil engineering business, and its Vinculum subsidiary "had become one of the major precast concrete undertakings in the country." Under Robin Martin's leadership, Tarmac moved from being an important regional force to a national roadstone and contracting business. Acquisitions played a major role in Tarmac's growth. While leading the roadstone division, Martin had been responsible in 1959 for the acquisition of local competitor Tarslag and Crow Catchpole, which gave it a greater presence in the south east. In
Cetacean surfacing behaviour Cetacean surfacing behaviour Cetacean surfacing behaviour or breaching is a group of behaviours demonstrated by the Cetacea infraorder when they come to the water's surface to breathe. Time intervals between surfacing can vary depending on the species, surfacing style or the purpose of the dive, and some species have been known to dive for up to 85 minutes at a time when hunting. In addition to respiration, cetaceans have developed and used surface behaviours for many other functions such as display, feeding and communication. All regularly observed members of the order Cetacea, including whales, dolphins and porpoises, show a range