  Live 60Fe has recently been detected in a deep-ocean ferromanganese crust,
isolated in layers dating from about 3 Myr ago. Since 60Fe has a mean life of
2.2 Myr, a near-Earth supernova is the only likely source for such a signal,
and we explore here the consequences of a supernova origin. We combine the 60Fe
data with several supernova nucleosynthesis models to calculate the supernova
distance as a function of progenitor mass, finding an allowed range of 15-120
pc. We also predict the signals expected for several other radioisotopes, which
are independent of the supernova distance. Species likely to be present near or
above background levels are 10Be, 26Al, 53Mn, 182Hf and 244Pu. Of these, 182Hf
and 244Pu are nearly background-free, presenting the best opportunities to
provide strong confirmation of the supernova origin of the 60Fe signal, and to
demonstrate that at least some supernovae are the source for the r-process. The
accuracies of our predictions are hampered by large uncertainties in the
predicted 60Fe yields for supernovae of different masses, so the new crust data
motivate a redoubled theoretical attack on this problem.
