| Brule Formation(expression, geohistory, america, unit) |
| Carcharocles angustidens(expression, geohistory, america, unit) |
| Carcharocles auriculatus(expression, geohistory, america, unit) |
| Columbia River Basalt Group(expression, geohistory, america, unit) |
| Cynthiacetus(noun, geohistory, america, unit) |
| Eocene United States(expression, geohistory, america, paleontology) |
| Epihippus(noun, geohistory, america, unit) |
| Ferris Formation(expression, geohistory, america, unit) |
| Heptranchias howelli(expression, geohistory, america, unit) |
| Laramide orogeny(expression, geohistory, america, unit) |
| Leptomeryx(noun, geohistory, america, unit) |
| Marysvale volcanic field(expression, geohistory, america, unit) |
| Orohippus(noun, geohistory, america, unit) |
| Paleogene Alabama(expression, state, geohistory, paleontology) |
| Paleogene Alaska(expression, state, geohistory, paleontology) |
| Paleogene Arkansas(expression, state, geohistory, paleontology) |
| Paleogene California(expression, state, geohistory, paleontology) |
| Paleogene Colorado(expression, state, geohistory, paleontology) |
| Paleogene Florida(expression, state, geohistory, paleontology) |
| Paleogene Georgia(expression, state, geohistory, paleontology) |