According to the information you posted, Digidude, the 16mr IP anomaly is 1300m thick. It doesn't say at what deep it begins. Within the IP anomaly it says the center of the 18.5mr ovoid is at 600m below surface and is 300 - 500m thick. So the ovoid would begin anywhwere from 350m to 450m, would it not? The 16mr anomaly would begin closer to surface, but it is not stated at what depth it begins.