Paleomagnetic studies of the upper Eocene to Oligocene Lincoln Creek Formation, southern Olympic Peninsula, Washington, produce a polarity pattern spanning Chrons C15r to C6C. This allows direct correlation of the provincial foraminiferal and molluscan biostratigraphy with the global marine chronology. A high-temperature basalt date of 38.5 ± 1.6 Ma correlates with a position just below Chron C15, placing Chron C15r at about 38 Ma. This suggests that the age of the Eocene/Oligocene boundary within Chron C13r is younger than 38 Ma, probably about 37−36 Ma.

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