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 |
|---|---|
| Yeso Formation | — |
| Moldanubicum | tectonostratigraphic unit |
| Cambrian Period | — |
| Paleogene | chronostratigraphic unit |
| Los Rastros Formation | — |
| Ischigualasto Formation | fossil-bearing stratigraphic unit |
| Adigrat Sandstone formations | sedimentary rock unit |
| Curtis Formation | — |
| Aquitanian Stage of the Oligocene-Miocene transition | chronostratigraphic unit |
| De Grey Supergroup | rock unit |
| Turee Creek Group | geologic group |
| Fortescue Group | geologic group |
| Hamersley Group | geologic group |
| Fountain Formation | sedimentary rock unit |
| Capitanian age | chronostratigraphic unit |
| Wordian age | chronostratigraphic unit |
| Devonian Period | — |
| Kimmeridge Clay Formation | sedimentary rock unit |
| Lance Formation | sedimentary rock formation |
| Kem Kem beds | Cretaceous stratigraphic unit |
| Bahariya Formation | sedimentary rock formation |
| Gypsum Spring Formation | — |
| Lias Group | lithostratigraphic group |
|
Eramosa Formation (Silurian limestone and dolostone)
surface form:
Eramosa Formation
|
carbonate rock unit |
| Graneros Shale | Cretaceous stratigraphic unit |
| Benton Group | geologic group |
| Juniata Member | — |
| Tererro Member | — |
| Great Oolite Group | lithostratigraphic group |
| Cornbrash Formation | lithostratigraphic unit |
| Permian Period | — |
| Glen Rose Formation | — |
| Thermopolis Shale | Cretaceous stratigraphic unit |
| Chase Group | geologic group |
| Hennessey Group | geologic group |
| Ninnescah Shale | — |
| Harper Sandstone | sedimentary rock unit |
| Lourinhã Formation | sedimentary rock formation |
| Millstone Grit | sedimentary rock unit |
| Cedar Mesa Sandstone | sedimentary rock unit |
| Meghalayan | chronostratigraphic unit |