Valdar Jaanusson

{{Short description|Estonian-Swedish geologist (1823–1899)}}

{{Infobox scientist

| name = Valdar Jaanusson

| birth_date = 1923

| birth_place = Nömme, Tallinn

| death_date = August 28, 1999

| death_place = Täby, Stockholm

| citizenship = Sweden

| nationality = Swedish

| fields = Stratigraphy

| workplaces = Uppsala University
Geological Survey of Finland
Swedish Museum of Natural History

| alma_mater = Uppsala University

| known_for = Confacies
Jaanusson effect
Ordovician geology
Topostratigraphy

}}

Valdar Jaanusson (1923 – August 28, 1999) was an Estonian-Swedish geologist.{{cite web |url=http://www.ne.se/uppslagsverk/encyklopedi/l%C3%A5ng/valdar-jaanusson |title=Valdar Janusson |website=Nationalencyklopedin |publisher=Cydonia Development |access-date=June 22, 2016 |language=sv}} In 1960, he introduced the concept of topostratigraphy into Swedish stratigraphy.{{cite journal |editor-last1= Kumpulainen|editor-first1=Risto A.|date=2016 |title=Guide for geological nomenclature in Sweden |url=http://resource.sgu.se/dokument/om-geologi/guide-for-geological-nomenclature-in-sweden.pdf |journal=GFF |doi=10.1080/11035897.2016.1178666

|last1=Kumpulainen|first1=Risto A.|volume=139|pages=3–20|s2cid=132340999|doi-access=free}} A recognized expert on the geology of the Ordovician period, he was member of the Estonian Academy of Sciences.[https://www.dn.se/arkiv/familj/dodsfall-valdar-jaanusson/ Dödsfall: Valdar Jaanusson], Dagens Nyheter.