| Group/formation name | Group/formation name |
|---|
| Kizildjilginskii - Tajikistan | Knox/Chepultepec - United States |
| Kizildzhilga - Tajikistan | Knox/Copper Ridge - United States |
| Kizilirmak - Lower, Upper, - Türkiye | Knox/Cotter - United States |
| Kizilli - Türkiye | Knox/Newala - United States |
| Kjørrven - Norway | Knox/Roubidoux - United States |
| Klabava - Euloma Shale, Olesna, Olešná, Olešná Shales, - Czechia | Knoxville - United States |
| Kladno - Nyrany, Nýřany, Radnice, - Czechia | Knoxville - United States |
| Klasaman - Jef Lio, Klabelom, Klamesin Sandstone, Malaloenoe, - Indonesia | Kobangsan Series - North Korea, South Korea |
| Klasen - Sweden | Kobe/Tainohata - Japan |
| Klenova - Lower, - Russian Federation | Kobe/Yokawa - Japan |
| Klerf - Germany | Kobiwako/Gamo - Japan |
| Klettgau - Gruhalde, - Switzerland | Kobiwako/Koka - Japan |
| Klimovka - Russian Federation | Kobiwako/Ueno - Japan |
| Klingnau - Switzerland | Kobyuma - Russian Federation |
| Klinta - Sweden | Kochakan - Russian Federation |
| Klinteberg - A, Bed L-M, Hunninge, - Sweden | Kocherginskaya - Russian Federation |
| Klinteberg Beds - Bed A, Bed B, Beds L-M, Lower, Marl, Upper, - Sweden | Kochigatani - Japan |
| Kliwa Sandstone - Dysodilic Shale, - Romania | Kochigatani/Sabudani - Japan |
| Klokova - Greece | Kochigatani/Umegatani - Japan |
| Klondike Mountain - Tom Thumb, Tom Thumb Tuff, - United States | Kochumdek - Russian Federation |
| Klonowka - Poland | Kochusu - Tajikistan |
| Klonowka Shale - Poland | Kockatea - Australia |
| Klyuchevskaya - Russian Federation | Kockatea Shale - Hovea, - Australia |
| Klyuchiki - Russian Federation | Kodiang Limestone - Malaysia |
| Knauermolasse - Switzerland | Kodzhagulskaja - Kyrgyzstan |
| Knight - Australia | Koessen - Eiberg, Unit 1, Eiberg, Unit 2, Eiberg, Unit 3, Eiberg, Unit1, Hochalm, Hochalm, Unit 1, Hochalm, Unit 2, Hochalm, Unit 3, Hochalm, Unit 4, - Austria, Germany |
| Knockerk - Brickwork's Quarry Shales, Knockerk House Sandstone, Knockerk House Shales, - Ireland | Koetoi - Japan |
| Knockgardner - United Kingdom | Kogashira - Japan |
| Knocklofty - Poets Road Siltstone, - Australia | Koge-Davan Suite - Russian Federation |
| Knoppenbiessen - Germany | Kogsta - Sweden |