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/14c8721e-4d05-4aaa-90be-8607ae2f84b1 POLLEN Date=2024-10-24 User Id=tstevens Entity=WeightedRelation Operation=INSERT System Note=insert WeightedRelation New Value=id: null related concept uuid: fe06f678-7155-4f93-9e28-4c083d60cccc relationship type: null relationship value: null generated by: null Date=2024-10-24 User Id=tstevens Entity=Definition Operation=UPDATE Field=reference System Note=update Definition Old Value=Jackson, J.A. 1997. Glossary of Geology, 4th edition. American Geological Institute Bradley, R.S. 1999. Paleoclimatology: Recnstructing Climates of the Quaternary, 2nd ed. Harcourt Academic Press. New Value=Jackson, J.A. 1997. Glossary of Geology, 4th edition. American Geological Institute Bradley, R.S. 1999. Paleoclimatology: Recnstructing Climates of the Quaternary, 2nd ed. Harcourt Academic Press. Date=2024-10-24 User Id=tstevens Entity=WeightedRelation Operation=INSERT System Note=insert WeightedRelation New Value=id: null related concept uuid: 59719c53-a2b7-4200-9b3c-dfa5d39607f7 relationship type: null relationship value: null generated by: null Date=2024-10-24 User Id=tstevens Entity=WeightedRelation Operation=INSERT System Note=insert WeightedRelation New Value=id: null related concept uuid: adcd37fe-9f4a-4d8d-8f79-489775707ea2 relationship type: null relationship value: null generated by: null Pollen are several-celled microgametophyte of seed plants enclosed in amicrospore wall. Fossil pollen consists entirely of the microspore wall. Thestudy of pollen is called palynology or pollen analysis and is an importantaspect in reconstructing past climates. Paleoclimatic reconstructions by pollenanalysis is possible because (1) pollen grains possess morphologicalcharacteristics that are specif to a particular genus or species of plant; (2)they are produced in vast quantities by wind-pollinated plants and aredistributed widely from their source; (3) they are extremely resistant todecay; and (4) they reflect the natural vegetation at the time of pollendeposition, which can yield information about ast climatic conditions. 2024-10-24 11:08:28.0