| Historic & Deep | High Confidence |
| Historic & Deep | Moderate Confidence |
| Historic & Deep | Low Confidence |
| Historic & Shallow | High Confidence |
| Historic & Shallow | Moderate Confidence |
| Historic & Shallow | Low Confidence |
| Pre-Historic & Deep | High Confidence |
| Pre-Historic & Deep | Moderate Confidence |
| Pre-Historic & Deep | Low Confidence |
| Pre-Historic & Shallow | High Confidence |
| Pre-Historic & Shallow | Moderate Confidence |
| Pre-Historic & Shallow | Low Confidence |
| Less Detailed Mapping |
