History of the Marshall Islands began asserting her sovereignty over the Carolines, she made no effort to prevent the German Empire from gaining a foothold there. Britain also raised no objection to a German protectorate over the Marshalls in exchange for German recognition of Britain's rights in the Gilbert and Ellice Islands. On October 13, 1885, the gunboat under Captain Fritz Rötger brought German emissaries to Jaluit. They signed a treaty with Kabua, whom the Germans had earlier recognized as "King of the Ralik Islands," on October 15. Subsequently, seven other chiefs on seven other islands signed a treaty in German and Marshallese and a
Geology of the Pacific Ocean . The Pacific Ocean developed from the Panthalassa, a vast global ocean, following the breakup of the supercontinent Pangaea in the Mesozoic Era, gradually forming Gondwana and Laurasia, which in turn divided. There is no firm date for when the changeover occurred, as the replacement of the sea bed is a continuous process, though reconstruction maps often change the name from Panthalassic to Pacific around the time the Atlantic Ocean began to open. The Panthalassic Ocean first opened around 750 million years ago at the breakup of Rodinia, but the oldest Pacific Ocean floor is only around 180 Ma old.