The US Geological Survey is seeking qualified businesses to provide apatite fission-track and U-Pb analyses from geological samples collected in the Kuskokwim mountains region, Alaska. This is a sources sought notice for market research only, not a solicitation for proposals. The applicable NAICS code is 541380 with a size standard of $16.5 million. Responses must be submitted electronically by July 17, 2026, at 3:00 PM PST. Performance of services will be in Alaska.