Geophysical Aspects of the Search for the Quark

We discuss the suitability of natural media to serve as objects of analysis for quark abudance, including the effects of momentum distribution at production, concentration or dilution in collection, effective length of irradiation by cosmic radiation, and target shape. The resulting concentrations may vary by ten orders of magnitude, the lowest being for sea water, the highest for stratospheric aerosols and selected iron meteorites.