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. 2019 Jan 16;15(1):20180665. doi: 10.1098/rsbl.2018.0665

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© 2019 The Author(s)

Published by the Royal Society. All rights reserved.

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Figure 1. — Crossdating for absolute dating control. (a) Synchronous growth among three Pacific geoduck samples from Dungeness Spit, Washington, USA. Each decade is labelled with a dot; 2000 with three dots; 1950 with two dots. (b) Measurements of 30 Dungeness Spit samples after age-related growth declines have been removed. Also shown is their mean (the chronology). (c) The Dungeness Spit chronology plus two other geoduck chronologies from southern British Columbia, Canada. Superimposed is mean annual sea surface temperature anomaly for the British Columbia coast. Agreement within and among chronologies and instrumental records corroborate absolute dating. (Online version in colour.)