| Group/formation name | Group/formation name |
|---|
| Koobi Fora - Chari, Indet., KBS, Lokochot, Lokochot/Tulu Bor, Lonyumun, Lonyumun/Moiti, Lower Burgi, Moiti, Okote, Okote and KBS, Tulu Bor, Tulu Bor/Lower Burgi, Upper Burgi, indet, - Kenya | Korotkinskaya - Russian Federation |
| Koopnap - Canada | Korpad - Hungary |
| Kootenai - United States | Kortijk Clay - Belgium |
| Kootenay - Canada | Kortrijk Clay - Roubaix Clay, - Belgium |
| Kootenay/Mist Mountain - Canada | Koruk - Türkiye |
| Kopanaskya - Russian Federation | Koryakovskaya - Kazakhstan |
| Kopanina - Lower, Upper, Upper Orthoceras Limestone, e2, - Czechia | Korycany - Czechia |
| Kopanskaya - Russian Federation | Korycany? - Czechia |
| Kopchugay - Turkmenistan | Korytnica Clays - Poland |
| Kope - Economy, Fulton, Fulton Shale, McMicken, Southgate, - United States | Korytnica Limestones - Slovakia |
| Kopieniec - Poland | Kos'yu - Russian Federation |
| Kopili - Bangladesh | Kosciusko - Doby's Bluff Tongue, - United States |
| Kopili Shale - India | Koshadjulba - Turkmenistan |
| Kopinge Sandstone - Sweden | Koshadzhulba - Turkmenistan |
| Kopkurgan - Kazakhstan | Koshelevka - Russian Federation |
| Koporskaya - Russian Federation | Koshelevskaya - Russian Federation |
| Koprivnice - Czechia | Koshelevskaya Suite - Russian Federation |
| Korallenkalk - Germany | Koshiba - Japan |
| Korallenoolith - Obere Korallenbank, Untere Folge, Untere Korallenbank, florigemma bank, - Germany | Koshikawa - Japan |
| "Korallenoolith" - Germany | Koshima - Japan |
| Koranga Sandstone - New Zealand | Kosode - Japan |
| Koraz/Kochumdek - Russian Federation | Kosov - Upper, - Czechia |
| Korgessaare - Estonia | Kossen - 2, 3, 6-7, Eiberg, Eiberg, Unit 1, Eiberg, Unit 2, Eiberg, Unit 3, Eiberg, Unit 4, Hochalm, Hochalm, Unit 1, Hochalm, Unit 2, Hochalm, Unit 3, Hochalm, Unit 4, Hochalm, Unit1, Hochalm, Unit3, Hochalm,Unit1, Hochalm,Unit2, Hochalm,Unit3, Hochalm,Unit4, Holchalm, Unit 2, Holchalm, Unit 3, Unit 3, Unit 4, Unit 6-7, - Austria, Germany |
| Korkino - Russian Federation | Kota - India |
| Korojon - Australia | Kotanbetsu - Japan |
| Korojon Calcarenite - Australia | Kotchakan - Middle, - Russian Federation |
| Korond - Iran | Kotelnich - Sloboda, - Russian Federation |
| Koronia - Cyprus | Kotelnich/Urpalov - Shestakovy, Vanyushonki, - Russian Federation |
| Korosica - Slovenia | Kotick Point - Antarctica |
| Korot'/Sette-Daban - 2, 3-4, - Russian Federation | Kotlin - 4, - Belarus, Estonia |