The presence of a marsh sequence between two shallow-water marine deposits in an offshore core from Lunenburg, Nova Scotia, indicates fall of relative sea level followed by rise of relative sea level. The marsh sequence is now 27 m below datum level, with a C14 date of 7,070 yr B.P. This sequence suggests that the glacial forebulge migrated through this area 7,000 yr ago, that 27 m of submergence has occurred since then, and that prior to 7,000 yr B.P. the site was characterized by low-amplitude emergence. This is at present the only sequence where the entire regression-transgression record is preserved along this coast; the accuracy required to demonstrate this can be obtained only by using established marsh foraminiferal zonations.