https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf 23.7 2026-04-15T10:53:30.610Z https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/sciencekeywords/9761565c-2126-49cd-b4c4-cd3bcb5dbbde VOLCANIC DEPOSITS Date=2024-10-25 User Id=tstevens Entity=WeightedRelation Operation=INSERT System Note=insert WeightedRelation New Value=id: null related concept uuid: 52325c6e-1084-43c1-83b2-278bbe0201c6 relationship type: null relationship value: null generated by: null Date=2024-10-25 User Id=tstevens Entity=WeightedRelation Operation=INSERT System Note=insert WeightedRelation New Value=id: null related concept uuid: c736e45d-63f2-428b-abae-48f79d007703 relationship type: null relationship value: null generated by: null Date=2024-10-25 User Id=tstevens Entity=WeightedRelation Operation=INSERT System Note=insert WeightedRelation New Value=id: null related concept uuid: 2f4ccb5c-7b99-442c-9054-964070d95f7b relationship type: null relationship value: null generated by: null Volcanic deposits can consist of tephra, which is airborne pyroclasticmaterial. Extremely explosive volcanic eruptions can produce vast quatntitiesof tephra over wide areas. Tephra layers can form regional isochronousstratigraphic markers. Tephrachronology can a very important tool inpaleoclimatic studies. Volcanic ash horizons can also be used aschronostratigraphic markers. 2024-10-25 09:54:20.0