Question: When did the body of water in which Elephant Island can be found come into existence?

full_context: Document 1: Opening of the North Atlantic Ocean: Rocks from the North Atlantic Igneous Province have been found in Greenland, the Irminger Basin, Faroe Islands, Vøring Plateau (off Norway), Faroe - Shetland Basin, Hebrides, Outer Moray Firth and Denmark. The supercontinent known as Pangea existed during the late Paleozoic and early Mesozoic eras and began to rift around 200 million years ago. Pangea had three major phases of breakup. The first major phase began in the Early - Middle Jurassic, taking place between North America and Africa. The second major phase of breakup began in the Early Cretaceous. The South Atlantic Ocean opened around 140 million years ago as Africa separated from South America, and about the same time, India separated from Antarctica and Australia, forming the central Indian Ocean. The final major phase of breakup occurred in the early Cenozoic, as Laurentia separated from Eurasia. As the two plates broke free from each other, the Atlantic Ocean continued to expand.
Document 2: Mirounga Point: Mirounga Point () is the east entrance point to Potter Cove, King George Island, in the South Shetland Islands off Antarctica. The feature was called "Punta Baliza" (beacon point) by R. Araya and F. Herve in 1966. It was later called "Punta Elefante" by the Argentine Antarctic Expedition after the elephant seal ("Mirounga leonina"), in connection with the establishment of Site of Special Scientific Interest number 13 (now Antarctic Specially Protected Area 132) in this vicinity under the Antarctic Treaty. The approved name avoids the duplication of Elephant Point on Livingston Island.
Document 3: Geological history of Earth: During the Eocene (56 million years ago - 33.9 million years ago), the continents continued to drift toward their present positions. At the beginning of the period, Australia and Antarctica remained connected, and warm equatorial currents mixed with colder Antarctic waters, distributing the heat around the world and keeping global temperatures high. But when Australia split from the southern continent around 45 Ma, the warm equatorial currents were deflected away from Antarctica, and an isolated cold water channel developed between the two continents. The Antarctic region cooled down, and the ocean surrounding Antarctica began to freeze, sending cold water and ice floes north, reinforcing the cooling. The present pattern of ice ages began about 40 million years ago.[citation needed]
Document 4: Antarctica: Antarctica (US English i/æntˈɑːrktɪkə/, UK English /ænˈtɑːktɪkə/ or /ænˈtɑːtɪkə/ or /ænˈɑːtɪkə/)[Note 1] is Earth's southernmost continent, containing the geographic South Pole. It is situated in the Antarctic region of the Southern Hemisphere, almost entirely south of the Antarctic Circle, and is surrounded by the Southern Ocean. At 14,000,000 square kilometres (5,400,000 square miles), it is the fifth-largest continent in area after Asia, Africa, North America, and South America. For comparison, Antarctica is nearly twice the size of Australia. About 98% of Antarctica is covered by ice that averages 1.9 km (1.2 mi; 6,200 ft) in thickness, which extends to all but the northernmost reaches of the Antarctic Peninsula.
Document 5: Muckle Bluff: Muckle Bluff is a bluff west of Walker Point on the south coast of Elephant Island in the South Shetland Islands of Antarctica. It was mapped by the UK Joint Services Expedition, 1970-71. The descriptive name for this prominent feature was applied by the United Kingdom Antarctic Place-Names Committee (UK-APC) in 1971; muckle being an old Scottish word meaning large.
Document 6: Cape Yelcho: Cape Yelcho is the northwestern extremity of Elephant Island in the South Shetland Islands of Antarctica. It was named by the UK Joint Services Expedition, 1970–71, after the Chilean steam tug "Yelcho".
Document 7: Elephant Island: Elephant Island is an ice-covered mountainous island off the coast of Antarctica in the outer reaches of the South Shetland Islands, in the Southern Ocean. Its name was possibly given by early explorers sighting elephant seals on its shores. The island is situated north-northeast of the tip of the Antarctic Peninsula, west-southwest of South Georgia, south of the Falkland Islands, and southeast of Cape Horn. It is within the Antarctic claims of Argentina, Chile and the UK. Brazil has a shelter on the island, Goeldi, supporting the work of up to six researchers each during the summer and had another (Wiltgen), which was dismantled in the summer of 1997/98.
Document 8: Southern Ocean: By way of his voyages in the 1770s, Captain James Cook proved that waters encompassed the southern latitudes of the globe. Since then, geographers have disagreed on the Southern Ocean's northern boundary or even existence, considering the waters as various parts of the Pacific, Atlantic, and Indian Oceans, instead. However, according to Commodore John Leech of the International Hydrographic Organization (IHO), this situation has no scientific sense since it has different ecosystem and life from the three oceans mentioned before and is located on a southern portion of Earth, hence the name of an ocean. This remains the current official policy of the IHO, since a 2000 revision of its definitions including the Southern Ocean as the waters south of the 60th parallel has not yet been adopted. Others regard the seasonally - fluctuating Antarctic Convergence as the natural boundary.
Document 9: Elephant Jason Island: Elephant Jason is one of the Jason Islands in the north west Falkland Islands. In Spanish, it is considered one of the "Islas las Llaves" (eastern, Seal Rocks and North Fur Island); such a distinction does not exist in English between the two groups of the islands. It is named for the southern elephant seals.
Document 10: Mount Pendragon: Mount Pendragon is a mountain (975 m high) north-west of Cape Lookout, Elephant Island, in the South Shetland Islands of Antarctica. It was mapped by the UK Joint Services Expedition, 1970-71. The name was applied to this highest mountain on Elephant Island by the United Kingdom Antarctic Place-Names Committee (UK-APC) in 1971 and acknowledges Prince Charles, the Prince of Wales, as royal patron of the Joint Services Expedition. Pendragon is the ancient title for a Welsh Prince.
Document 11: Antarctica: Positioned asymmetrically around the South Pole and largely south of the Antarctic Circle, Antarctica is the southernmost continent and is surrounded by the Southern Ocean; alternatively, it may be considered to be surrounded by the southern Pacific, Atlantic, and Indian Oceans, or by the southern waters of the World Ocean. It covers more than 14,000,000 km2 (5,400,000 sq mi), making it the fifth-largest continent, about 1.3 times as large as Europe. The coastline measures 17,968 km (11,165 mi) and is mostly characterized by ice formations, as the following table shows:
Document 12: Antarctic Plate: The Antarctic Plate is a tectonic plate containing the continent of Antarctica, the Kerguelen Plateau and extending outward under the surrounding oceans. After breakup from Gondwana (the southern part of the supercontinent Pangea), the Antarctic plate began moving the continent of Antarctica south to its present isolated location causing the continent to develop a much colder climate. The Antarctic Plate is bounded almost entirely by extensional mid-ocean ridge systems. The adjoining plates are the Nazca Plate, the South American Plate, the African Plate, the Somali Plate, the Indo-Australian Plate, the Pacific Plate, and, across a transform boundary, the Scotia Plate.
Document 13: Southern Ocean: The Southern Ocean, geologically the youngest of the oceans, was formed when Antarctica and South America moved apart, opening the Drake Passage, roughly 30 million years ago. The separation of the continents allowed the formation of the Antarctic Circumpolar Current.
Document 14: Saddleback Point: Saddleback Point is a headland on the northern coast of Elephant Island, in the South Shetland Islands of Antarctica. The site lies to the west of Point Wild.
Document 15: Geological history of Earth: Antarctica continued to become more isolated and finally developed a permanent ice cap. Mountain building in western North America continued, and the Alps started to rise in Europe as the African plate continued to push north into the Eurasian plate, isolating the remnants of Tethys Sea. A brief marine incursion marks the early Oligocene in Europe. There appears to have been a land bridge in the early Oligocene between North America and Europe since the faunas of the two regions are very similar. During the Oligocene, South America was finally detached from Antarctica and drifted north toward North America. It also allowed the Antarctic Circumpolar Current to flow, rapidly cooling the continent.
ground_truth: roughly 30 million years ago
sub_queries: Elephant Island >> located in or next to body of water Answer: Southern Ocean
when did Southern Ocean come into existence Answer: roughly 30 million years ago