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Rock of ages: A laboratory spotlight highlights the odd coloration of a special sedimentary rock in the geology department in Holmes Hall. In its heyday-38,270 years ago, to be exact-the rock was actually a larch tree on Cape Breton Highlands in Nova Scotia. Compressed over eons and preserved in glacial sediment, the two-foot-long petrified log is now a tool for Peter Rosen and his colleagues in chronicling the geological history of New England.
Photograph by David Leifer
