| Group/formation name | Group/formation name |
|---|
| Chehalis - United States | Chercombe Bridge Limestone - United Kingdom |
| Cheikhia - Algeria | Cheremkhovo - Russian Federation |
| Cheile Dâmbovicioarei - Romania | Cheremkhovo Suite - Russian Federation |
| Chekhan - Russian Federation | Cheremkhovskaya - Ust' -Baleyskaya, - Russian Federation |
| Chekhov - Russian Federation | Cheriyusskaya Suite - Russian Federation |
| Chelamchin - Tajikistan | Chernaya Bay Horizon - Russian Federation |
| Chelif/Tripoli - Algeria | Chernorechian Suite - Russian Federation |
| Chelkarnura - Kazakhstan | Chernovskaya/Doronino - Russian Federation |
| Chelyabinskaya Series/Kalachevskaya Suite - Russian Federation | Chernyi Kamen - Konovalovka, Sinii Kamen, - Russian Federation |
| Chelyabinskaya Series/Korkinskaya Suite - Russian Federation | Chernyshevskaya - Russian Federation |
| Chelyabinskaya Series/Kozirevskaya Suite - Russian Federation | Chernyshin - Russian Federation |
| Chemeron - Kenya | Chernyshinsk - Russian Federation |
| Chemoigut - Kenya | Cherokee - United States |
| Chemung - United States | Cherokee - United States |
| Chemung - United States | Cherokee Shale - Ardmore Limestone, Ardmore ls, Ardmore ls?, Bluejacket ss, Breezy Hill ls, - United States |
| Chemung - Cayuta, Cayuta Sandstone, Chautauquan, Panama Conglomerate, Portage, Wellsburg Fm., erratic, - Belgium, United States | Cherokee/Ardmore - United States |
| Chemung - United States | Cherokee/Cabaniss - Robinson Branch, Scammon, Scammon Shale, Tiawah Limestone, Wier-Pittsburg Coal, - United States |
| Chemung - United States | Cherokee/Drywood - United States |
| Cheney Longville - Crosspipes, Glynboro, - United Kingdom | Cherokee/Krebs - Rowe, Seville, Seville Limestone, - United States |
| Chengapara - India | Cherokee/Riverton - United States |
| Chengqianggou - China | Cherokee/Verdigris - United States |
| Chengzhi - China | Cherpel' Suite - Russian Federation |
| Chengzhihuo - China | Cherra - India |
| ChenJiaBa - China | Cherry Canyon - Getaway, Getaway / South Wells, Getaway Shale, Goat Seep, Manzanita, South Wells, - United States |
| Chenpeng - Shangtianti, - China | Cherry Ridge - United States |
| Chenque - Argentina | Cherryvale - New Harmony Shale, Wea Shale, - United States |
| Chenxiacun - China | Chersonian - Russian Federation, Ukraine |
| Chepa Suite - Russian Federation | Chertovskian/Mangazea - Russian Federation |
| Chepotsunai - Japan | Chertovskian/Ust'Stolbovaya - Russian Federation |
| Chepultepec - United States | Chertovskoi/Chertovskaya - Russian Federation |