The U.S. Geological Survey is conducting market research to identify businesses capable of providing specialized, high-throughput U-Th-Pb zircon geochronology and Lu-Hf isotopic analysis for 28 rock samples, including extremely fine-grained volcanic tephra. The required services also encompass mineral separation, specific imaging techniques, and integrated analytical workflows using advanced instrumentation. This is a sources sought notice for planning purposes only and is not a formal solicitation. Responses, which must demonstrate the technical capability to perform this highly specialized work, are to be submitted via email. They must be received in full by the specified deadline.