Kachemak Bay in south-central Alaska is approximately 38 mi (60 km) long and 13 mi (20 km) wide at the mouth. Geologically, Kachemak Bay marks the boundary between the Mesozoic rocks of the Kenai Mountains and the low-lying Tertiary sediments of the northwestern part of the Kenai Peninsula. The Border Ranges fault is believed to traverse the bay, though the fault's exact location is not known. In the summer of 1981, a marine magnetic survey was carried out to locate the fault and/or other geologic boundaries. The magnetic data indicate that a fault, presumed to be the Border Ranges fault, traverses the bay between the Seldovia and Homer areas. The location of what is inferred to be the contact between the Mesozoic and Tertiary rocks can also be seen in the magnetic data. he data also suggest the existence of an ultramafic body beneath the bay.

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