The U.S. Geological Survey is conducting market research to identify qualified businesses capable of providing laboratory services for tree ring samples as described in a Statement of Work. This is a sources sought notice for planning purposes only, not a request for quote or proposal, and the government will not pay for any costs incurred in responding. The applicable NAICS code is 541990 with a size standard of $19.5 million. Interested responsible sources may submit a brochure demonstrating their ability to meet the requirements. Responses must be submitted electronically via email to the specified contact.