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GSS Lab Provides Fission Track, UPb, and Mineral Separation Services

GeoSep Services (GSS) is a locally owned small business, staffed by a small group of loyal employees. We are dedicated to providing high-quality mineral separations along with apatite and zircon fission track+UPb analyses to support the international geochronology/thermochronology community.

GSS is located in Moscow, Idaho, within the beautiful Palouse region of Idaho and Washington, USA.

We specialize in apatite fission track (AFT) analysis, zircon fission track (ZFT) analysis, zircon UPb, and mineral separations.

Note: for an additional fee of $100, we can provide pyrite (sulfide) removal/cleanup of zircon fractions (DIM sink) if requested.
(See Services)

Update April 2024:

Good news! GSS is catching up on the prior sample backlog, and turnaround times are returning close to "normal". Now is a great time to send GSS your samples! Note: GSS is prioritizing combo min sep & analytical projects over just min sep projects. Please contact Paul or Jim with questions.

Thank you to all our clients and colleagues for your support.

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Current, upcoming, and prior events:

We plan to attend the Geological Society of America (GSA) Cordilleran/Rocky Mtn section meeting (Spokane, May 2024) and the annual GSA Connects meeting (Anaheim, September 2024).

GSS attended prior annual Geological Society of America (GSA) Connects meetings. Most recent: Pittsburgh in October 2023 (GSA Connects 2023 link); Denver in October 2022; Portland in October 2021.

GSS attended prior Thermo meetings. Most recent: 2023 in Riva del Garda, Italy (September; Thermo2023 link); Thermo"2020" in Santa Fe, NM in September 2021 (

We appreciate these opportunities to meet our current and prospective clients and colleagues, and to support advancements in the geochronology/thermochronology community.

Check out our photos from some of our conference/meeting trips.

See some GSS conference duck, hat, and string bag adventures!

Note: If you have concerns about our website or links, please contact the webmaster.