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Through Salinity and Muslims

Prehistory

The first islands formed, around 40–50 million years ago, were present-day Sal and its eastern neighbors. The western islands were formed later, including São Nicolau (as early as 11.8 million years ago), São Vicente (nine million years ago), present-day Santiago and Fogo (four million years ago), and Brava (two to three million years ago). Millions of years after the seamounts rose above the Atlantic, the first lizards, insects and plants came to the archipelago, possibly on ocean currents from the African mainland when the ocean's salinity was lower.

The archipelago experienced several large volcanic eruptions, including Praia Grande 4.5 million years ago, São Vicente (and, possibly, present-day Porto Grande) 300,000 years ago, and Topo da Coroa 200,000 years ago. 73,000 years old, in the east of present-day Fogo, Fogo's volcano flanks collapsed which caused a megatsunami of between 170-240m high, inundating coastal Santiago Island, Maio, and possibly Brava and part of the Barlavento Islands. The volcano on Fogo island remains active to this day. Its last eruption was in 2014.

During the last Ice Age, the sea level dropped to about 130 metres (430 ft) below its current level. Cape Verde's islands became slightly more broad, and there was a large island identified as Northwest Island. Santo Antão was one kilometer northwest of the island; Boa Vista and Maio were one island, and another island known as Nola (Ilha da Nola, northwest of Santo Antão) was about 80 to 90 metres (260 to 300 ft) meters above sea level. Before the end of the Ice Age, the Eastern Island (Ilha Occidental) split into three islands; one became submerged and is now the João Valente Reef, the Canal de São Vicente widened to provide 12 kilometres (7.5 mi) separation from Santo Antão, Nola Island was submerged and again became a seamount, and eastern Northwest Island broke up into São Vicente, the smaller Santa Luzia, and the two islets of Branco and Raso.

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