This Feature Class contains Common Risk Segment (CRS) polygon features for denoting the risk of seal rocks being absent within the Miocene succession in sedimentary basins in the Northwest Province (Taranaki, Deepwater Taranaki, and Reinga-Northland basins). Risk is depicted by a relatively simple "traffic-light" system: green colours denote low risk, orange denotes moderate risk, and red colours denote high risk. It is important to note that a rating of high risk (red) for this petroleum systems element does not conclusively rule it out; rather, it indicates that on the basis of currently available open-file information there is a high risk for that factor being able to effectively contribute to the petroleum system in that area. For any given prospective area, more detailed work and data acquisition would be required. For more information about these data please refer to: Arnot, M.J. and Bland, K.J. et al. (Compilers), 2016. Atlas of Petroleum Prospectivity, Northwest Province: ArcGIS geodatabase and technical report. GNS Science Data Series 23b.