![]() ![]() 'There must have been a connection between the populations of both sides, because they show the same evolution, the same timing.' 'These giants occur, apparently, at more or less the same time on both sides of the Atlantic,' said paper author and palaeontologist Christina Ifrim of the Heidelberg University told Live Science. seppenradensis (pictured) is the largest ammonite known, with a shell 5.7 feet (1.7 m) across Unearthed near the German town of Lüdinghausen in 1895, the type specimen of P. The specimens unearthed in the UK came from Peacehaven, on the East Sussex coast - and from the chalk cliffs of east Kent, specifically at Kingsgate Bay, Minnis Bay and Palm Bay. The researchers said that they were surprised to find both Parapuzosia species on both sides of the Atlantic. leptophylla - but, the team noted, larger sizes began to appear in the fossil record by the middle early Campanian. seppenradensis fossils only reached 3.2 feet in width - like P. seppenradensis specimens were all younger, hailing from later still in the Santonian and early in the Campanian age (83.6 million to 72.1 million years ago) that followed it. leptophylla to come from the late Santonian age (86.3–83.6 million years ago) - while reaching up to 3.2 feet (1 metres) wide. Sixty-six Mexican specimens were unearthed from a dry riverbed near Tepeyac, a village 25 miles north of Piedras Negras.ĭating the fossils based on the sediment layers, the team found P. In their study, geologist Andy Gale of the University of Portsmouth and colleagues examined a total of 154 ammonite specimens - some from existing museum collections, but mostly newfound fossils recovered from England and Mexico. ![]()
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