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Grace Cathedral stands on top of San Francisco’s iconic Nob Hill. A large redwood altar has been a prominent feature of the Cathedral since 1964, inspiring many to wonder about the altar’s origin and the history of its wood.

Grace Cathedral archivist, Michael Lampen, confirmed that the redwood piece was originally showcased by the California Redwood Company in the Humboldt area in the 1950s and eventually given to the cathedral by Mr. George Livermore. But where did the redwood itself come from and how old is it?

To answer this interesting question, Redwoods and Climate Change Initiative researcher, Allyson Carroll, visited Grace Cathedral recently to see what she could decipher from a close look at the redwood altar’s wood.

Allyson’s expertise in the field of dendrochronology (the study of tree rings) has helped us discover how the local environment leaves a distinct pattern in the wood of coast redwood and giant sequoia trees. Allyson hoped she would be able to age the wood and recognize what forest region the redwood tree likely came from based on the pattern of tree rings visible on the altar’s edge.

Allyson studied the number of tree rings and their relative thickness to each other within the altar and found a signature pattern dating the redwood to 1561-1684 A.D. The tree ring pattern visible in the altar also suggests the redwood did in fact come from a coast redwood forest in Northern California.

The Redwoods and Climate Change Initiative redwood tree ring archive is helping us track the response of redwood forests to changing climate, but is also helping us unravel mysteries like this one. Watch Allyson describe how she decodes redwood tree rings here.


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About Emily Burns

Emily joined Save the Redwoods League as the Director of Science in 2010 after studying redwood forest ecology for seven years.


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