stratigraphic unit
C1098
concept
A stratigraphic unit is a volume of rock or sediment defined and distinguished from adjacent material by its recognizable and mappable physical, chemical, or paleontological characteristics and its position in the geological record.
All labels observed (62)
| Label | Occurrences |
|---|---|
| stratigraphic unit canonical | 65 |
| sedimentary rock unit | 59 |
| chronostratigraphic unit | 30 |
| geologic group | 23 |
| rock unit | 12 |
| lithostratigraphic unit | 9 |
| sedimentary rock formation | 9 |
| geologic supergroup | 7 |
| lithostratigraphic group | 6 |
| sedimentary rock sequence | 6 |
| carbonate rock unit | 5 |
| tectonostratigraphic unit | 5 |
| Cretaceous stratigraphic unit | 4 |
| fossil-bearing stratigraphic unit | 4 |
| chronostratigraphic boundary | 3 |
| geologic unit | 3 |
| geological group | 3 |
| member (stratigraphy) | 3 |
| metamorphic rock sequence | 3 |
| coal-bearing formation | 2 |
| geological layer | 2 |
| igneous rock unit | 2 |
| subdivision of the Devonian Period | 2 |
| tectonostratigraphic zone | 2 |
| Devonian stratigraphic unit | 1 |
| Mesozoic stratigraphic unit | 1 |
| Ordovician stratigraphic unit | 1 |
| Permian rock unit | 1 |
| Permian stratigraphic unit | 1 |
| Pleistocene stratigraphic unit | 1 |
| Precambrian rock unit | 1 |
| Proterozoic rock unit | 1 |
| Silurian stratigraphic unit | 1 |
| Triassic rock unit | 1 |
| Triassic stratigraphic unit | 1 |
| ammonite zone | 1 |
| biostratigraphic subdivision | 1 |
| biostratigraphic zone | 1 |
| coal-bearing stratigraphic unit | 1 |
| crystalline limestone | 1 |
| epoch of the Quaternary Period | 1 |
| formal chronostratigraphic unit | 1 |
| fossil-based correlation unit | 1 |
| fossiliferous stratigraphic unit | 1 |
| geologic member | 1 |
| geologic series | 1 |
| geological horizon | 1 |
| limestone unit | 1 |
| mass extinction boundary | 1 |
| metamorphosed sedimentary rock sequence | 1 |
| rock sequence | 1 |
| rock succession | 1 |
| sedimentary rock succession | 1 |
| sedimentary sequence | 1 |
| stratigraphic group | 1 |
| stratigraphic level | 1 |
| stratigraphic sequence | 1 |
| stratigraphic subdivision | 1 |
| stratigraphic subgroup | 1 |
| stratigraphic succession | 1 |
| stratigraphic supergroup | 1 |
| subsurface geological unit | 1 |
Description generation (CDg)
The one-sentence description above was generated by prompting gpt-5.1 with the class name and this instruction.
Instruction
generate a one-sentence description for a given conceptual class. # Response Format Return only the sentence: "Description: [one-sentence description of the conceptional class]"
Input
Class: stratigraphic unit
Generated description
A stratigraphic unit is a volume of rock or sediment defined and distinguished from adjacent material by its recognizable and mappable physical, chemical, or paleontological characteristics and its position in the geological record.
Instances (241)
| Instance | Via concept surface |
|---|---|
| Areyonga Formation | — |
| Olympic Formation | — |
| Claron Formation | rock unit |
| Mereenie Sandstone | sedimentary rock unit |
| Hermannsburg Sandstone | — |
| Hettange-Grande Formation | sedimentary rock unit |
| Hawkesbury Sandstone | sedimentary rock unit |
| Narrabeen Group | geologic group |
| Wianamatta Group | geological group |
| Illawarra Coal Measures | — |
| Newcastle Coal Measures | sedimentary sequence |
| Tomago Coal Measures | coal-bearing stratigraphic unit |
| Fox Hills Formation | — |
| Pierre Shale | sedimentary rock unit |
| Fort Union Formation | sedimentary rock unit |
|
Maastricht Formation in the Netherlands
surface form:
Maastricht Formation
|
sedimentary rock unit |
| Cerro Barcino Formation | — |
| Triassic | chronostratigraphic unit |
| Wordian | chronostratigraphic unit |
| Wuchiapingian | chronostratigraphic unit |
| London Clay Formation | — |
| Thames Group | geological group |
| Reading Formation | lithostratigraphic unit |
| Lambeth Group | rock unit |
| Bagshot Beds | sedimentary rock unit |
| Reading Beds | sedimentary rock unit |
| Thanet Sand Formation | — |
| Furongian | chronostratigraphic unit |
| Catskill Delta complex | Devonian stratigraphic unit |
| Kellwasser horizons | geological horizon |
| Hangenberg black shales | sedimentary rock unit |
| Calvert Formation | — |
| Chesapeake Group | geologic group |
| Holston Formation | — |
| Meghalayan Age | chronostratigraphic unit |
| Iberian Massif | tectonostratigraphic unit |
| Coal Measures | — |
| Great Valley Group | geologic group |
| Lookout Sandstone | sedimentary rock unit |
| Whin Sill dolerite | igneous rock unit |
| Stiperstones Quartzite | geologic unit |
| Sherwood Sandstone Group | lithostratigraphic group |
| Mercia Mudstone Group | lithostratigraphic group |
| Old Red Sandstone | sedimentary rock sequence |
| Raton Formation | — |
| Trinidad Sandstone | sedimentary rock unit |
| Poison Canyon Formation | — |
| Vermejo Formation | sedimentary rock unit |
| Troy VIIa | stratigraphic level |
| Earth's crust | geological layer |