Taxon
- Calappa hepatica11 objects
- Callianassidae3 objects
- Callipepla californica1 objects
- Callorhinus alascanus1 objects
- Callorhinus ursinus1 objects
- Camelops (extinct)4 objects
- Canidae10 objects
- Caniformia1 objects
- Caninae1 objects
- Canis39 objects
- Canis latrans40 objects
- Canis lupus36 objects
- Capra2 objects
- Caprifoliaceae1 objects
- Capsella bursa-pastoris1 objects
- Cardiospermum halicacabum1 objects
- Cardita variegata1 objects
- Cardium8 objects
- Carex271 objects
- Carex barbarae2 objects