Varved Marine Sediments in a Stagnant Fjord

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Science  06 Sep 1963:
Vol. 141, Issue 3584, pp. 918-919
DOI: 10.1126/science.141.3584.918


Varved sediments, containing planktonic marine diatoms, occur in Saanich Inlet, British Columbia. An olive-gray lamina, rich in opal, apparently forms during the bloom of Skeletonema costatum in the spring or summer, after which an olive-black lamina is deposited.