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Throughout the Quaternary , a relatively constant level of opal depositional rates in the Bellingshausen Sea indicates stable climatic conditions in the Antarctic Peninsula area . High opal depositional rates during the early Pliocene document a strong reduction of sea-ice coverage and relatively warm climatic conditions in the Bellingshausen Sea . The hearing before the ALJ was with respect to the decision of the I.G . The officers of the Society listed in Article 4 , Section 1 , and three Members-at-Large shall comprise the Executive Committee , which is empowered to conduct the business of the Society between meetings . " Range : This species is distributed in the Fraser River system of British Columbia and in the Columbia and Snake River drainages of Oregon , Washington , and Idaho . Supposing that the sea-ice coverage within the Antarctic Zone was the main factor controlling biological productivity in the Bellingshausen Sea , and thus the estimated opal depositional rates on the continental rise , we reconstructed paleoceanographic long-term changes during the Neogene and Quaternary considering the climatic control on regional and global scales .