The US Geological Survey is conducting market research to identify qualified businesses capable of performing apatite fission-track and U-Pb analyses on geological samples. This is a sources sought notice for planning purposes only and is not a request for proposals or a commitment to award a contract. The applicable NAICS code is 541380 with a size standard of $16.5 million. Responses, in the form of capability statements, must be submitted via email to a specified address.