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Betula irvajamensis
Betula irvajamensis Cheleb. Trudy Geol. Inst. Ross. Akad. Nauk, (540): 240. 24-31 Dec 2005
- Name
- Betula irvajamensis
- Rank
- Species
- Generic Name
- [Genus] Betula
- Authors (Pub.)
- Chelebaeva A. I.
- Publication
- Opisanie iskopaemykh rastenij [2005/12]
- Journal
- Trudy Geologicheskogo Instituta Rossijskoj Akademii Nauk
- Issue
- 540
- Page number
- 240
- Year
- 2005
- Fossil Status
- leaves
- Stratigraphy
- Eocene
- Strat. comment
- Irgirnin Formation
- Location
- Irvajam Creek, western Kamtschatka peninsula, Kamchatka Territory, Russian Federation
- Paleoregion
- Eurasia (Far East)
Data for Holotypus
- Repository
- Vernadsky State Geological Museum, Russian Academy of Sciences, Moscow, Russian Federation
- Repository Number
- 6273-23A
- Diagnosis
- Leaves elliptic, 5-9 cm long, 3-5 cm wide, apex acute, base rounded, slightly unequilateral; margin doubly serrate, petiole nearly 1 mm thick, 1-1,5 cm long; secondaries in 9-10 pairs, divergate af angles of 45-50°, regularly spaced, 2-3 of lowerest of them give off several short branches to the margin, enter the teeth; near the margin secondaries give off thin apical forks running to sinuses. Tertiaries form a network of weakly branched sca- lariform anastomoses.
