Class L planet

Class L Marginal
Class L planets range in age from 4 to 10 billion years old. Their diameters range in size from 10,000 to 15,000 km. They are located in the ecozone region of a star's solar system. They have rocky, barren surfaces with little water. Their atmospheres are oxygen/argon with a high concentration of carbon dioxide. Life forms, if any, are limited to plant life. Class L planets are suitable for human colonization with some terraforming.

Examples: Indri VIII, Vaadwaur Prime, and possibly Borg assimilated worlds.

Note: Earth may have become a Class L planet, as was seen briefly in the time conduit in Star Trek: First Contact, after the Borg altered the timeline and assimilated it.