Dear Colleagues, Those of you with a keen interest in geochronology, Mars and planetary samples may be interested in a workshop that Chris Herd and I are organizing in the near future. Details below: *Frontiers in Mars Sample Chronology* March 24-25, 2021 A virtual workshop sponsored by The Meteoritical Society and The Mineralogical Society of Great Britain and Ireland https://www.minersoc.org/mars-chron.html Determining the absolute ages of Mars samples is a key objective for current and future Mars exploration. Recent work on martian meteorites has pushed the analytical envelope in Mars sample geochronology; this work informs future plans for the geochronology of samples returned to Earth through Mars Sample Return, an effort that starts with the collection and caching of samples by the NASA Mars 2020 Mission. The goal of this workshop is to review recent results; identify and elaborate on the frontiers in spatial and isotopic resolution, and minimum sample mass; and consider advances that will be required to optimize the geochronology of future samples of Mars. Registration is free, but pre-registration is required. Registration and abstract deadline 12th March. We plan to hold the workshop over two half days, at times to try and make it possible for as many presenters as possible to join in live online. We hope you can join us! James Darling, University of Portsmouth Christopher Herd, University of Alberta