Figure 7. Seismic line from Casco Bay showing location and composition of vibracore with associated radiocarbon dates (after Kelley and others, 1992). The seafloor is made of modern mud, which is abruptly underlain by glacial-marine sand and mud at 22 m depth. The transgressive unconformity is the erosion surface which separates the two geologic units and which can be traced to modern bluffs where it is forming today at their eroding base (Figure 5).
Last updated on October 6, 2005