title: Flavonoids and other chemical constituents of fossil miocene zelkova (ulmaceae).
abstract: Organic solvent extractions of Zelkova oregoniana, a Miocene angiosperm compression fossil, indicate the chemical preservation of kaempferol, dihydrokaempferol, an n-alkane chain length range of 10 to 32 carbons, hydroxy acids, steranes, triterpenoids, and methyl pheophorbide a. This appears to be the oldest occurrence of flavonoids in fossil sediments reported.
authors.forename: K J
authors.initials: KJ
authors.lastname: Niklas
authors.forename: D E
authors.initials: DE
authors.lastname: Giannasi