Geology of the Pacific Ocean Geology of the Pacific Ocean The Pacific Ocean evolved in the Mesozoic from the Panthalassic Ocean, which had formed when Rodinia rifted apart around 750 Ma. The first ocean floor which is part of the current Pacific Plate began 160 Ma to the west of the central Pacific and subsequently developed into the largest oceanic plate on Earth. The tectonic plates continue to move today. The slowest spreading ridge is the Gakkel Ridge on the Arctic Ocean floor, which spreads at less than , while the fastest, the East Pacific Rise near Easter Island, has a spreading rate of over
Chamberlain Basin Individual lakes do not have official names and are listed from lowest to highest elevation. Chamberlain Basin Chamberlain Basin is a drainage basin that contains a chain of ten alpine and glacial Paternoster lakes in Custer County, Idaho, United States, located in the White Cloud Mountains in the Sawtooth National Recreation Area. Lakes are located on the upper portion of Chamberlain Creek in the Germania Creek watershed, a tributary of the East Fork Salmon River. Castle Peak, the highest summit in the White Cloud Mountains, rises to the east and north of Chamberlain Basin. Sawtooth National Forest trail 047 crosses