Fossil, known as "the Old Lady" by the bomber crews of the Resistance, was a female Martigrade who served as the commanding officer of the Resistance's StarFortress unit that included Cobalt and Crimson Squadron. Following the battle, she was aboard the Raddus as surplus crew and experienced sorrow at the losses. Sometime after the evacuation of D'Qar she gave Rose Tico a Resistance Ring.
- The Last Jedi: Cobalt Squadron (First appearance, simultaneous with The Last Jedi: Bomber Command)
- The Last Jedi: Bomber Command (First appearance, simultaneous with The Last Jedi: Cobalt Squadron)
- "Rose Knows"—Star Wars Adventures 6
- Star Wars: The Last Jedi: Expanded Edition (Mentioned only)
- Star Wars: The Last Jedi: A Junior Novel (Mentioned only)
- The Last Jedi: Rose Tico: Resistance Fighter
- (Indirect mention only)