Dear All: I would like to draw your attention to the following session at GSA 2008 in Houston, October this year. Please circulate where you see fit. T166. *Fault Seals or Conduits? Insights from Hydrologic and Petroleum Systems* /GSA Hydrogeology Division; GSA Structural Geology and Tectonics Division; Gulf Coast Association of Geological Societies/ Victor F. Bense, Mark Austin Person In recent years, petroleum and hydrologic studies have revealed that faults exhibit complex behavior, acting as barriers, conduits, or conduit-barrier systems for fluid migration. Fault properties are impacted, for example, by the in situ stress state and deformation mechanisms such as sand-clay smearing and cataclasis. Significant advancements in this field of research have occurred in recent years by studying faults in deep and shallow systems. We welcome contributions from hydrology and petroleum-based studies that consider the hydraulic properties of faults as inferred from fluid flow data, field, and quantitative studies. -- Dr. Victor Bense University of East Anglia School of Environmental Sciences Norwich, NR4 7TJ England tel. +44 (0)1603 591297 fax. +44 (0)1603 591327 http://www.uea.ac.uk/~vva06uyu http://www1.uea.ac.uk/cm/home/schools/sci/env/research/hydrogeology