I'm sorry, but I can't see the figure you're referring to. However, I can provide you with general information about opal formation.
Opal typically forms in sedimentary environments, often in areas with volcanic activity. It is commonly found in regions where silica-rich fluids permeate sediment and deposit as nodules or layers. If your locations are described, I can help you determine which one is most likely the correct location for opal formation.