These are arranged by feature type in alphabetical ordering, starting with north latitudes and prime meridian for each feature. Explanation of Conventions Used Table columns Feature Terminology . The feature type designations used here are informal.
Some terms imply a geologic origin and other terms are non-genetic.
Further more detailed division of feature types is generally more non-genetic. Similar informal terms were used early in the Magellan mission for many types of newly-identified morphological features. An attempt was made with some preliminary terms used by the Magellan team, to use Latin derivative terms, as was done successfully with tesserae earlier. Informal usage of Latin in addition to informal and colloquial terms in general impeded this approach and resulted in errors. These and other problems are of the type that are sorted out with usage, but should be noted and avoided.