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Rhamnus siwalica
Rhamnus siwalica Mah. Prasad, Kannaujia, Alok, S.K. Singh Palaeobotanist, 64(1–2): 38. 31 Dec 2015
- Name
- Rhamnus siwalica
- Rank
- Species
- Original spelling
- siwalicus
- Generic Name
- [Genus] Rhamnus
- Authors (Pub.)
- Prasad M.
Kannaujia A. K.
Alok
Singh S. K.
- Publication
- Plant megaflora from the Siwalik (Upper Miocene) of Darjeeling District, West Bengal, India and its palaeoclimatic and phytogeographic significance [2015/12]
- Journal
- Palaeobotanist
- Volume
- 64
- Issue
- 1–2
- Page number
- 38
- Year
- 2015
- Fossil Status
- leaves
- Stratigraphy
- Tortonian
- Strat. comment
- Geabdat Sandstone Formation (Middle Siwalik); Upper Miocene (Sarmatian to Pontian)
- Location
- Sevok Road Section, Oodlabari area, Darjeeling District, West Bengal, India
- Paleoregion
- Eurasia (Indostan)
Data for Holotypus
- Repository
- Birbal Sahni Institute of Palaeosciences, Lucknow, India
- Repository Number
- 40346 ["40446" under plates]
Data for Paratypus
- Repository
- Birbal Sahni Institute of Palaeosciences, Lucknow, India
- Repository Number
- 40347 ["40447" under plates]
- Diagnosis
- Leaf simple, symmetrical, elliptic; preserved size 5.2 x 2.6 cm and 5.5 x 2.6 cm; apex obtuse; base acute; margin almost entire; texture chartaceous; venation pinnate, eucamptodromous; primary vein single, prominent, almost straight, stout; secondary veins 8–9 pairs visible, 0.2 to 0.7 cm apart, alternate, unbranched, angle of divergence (40°–50°), narrow acute, curved up, curvature more pronounced and joined to their superadjacent secondary at obtuse angle; tertiary veins fine, angle of origin, usually RR, percurrent, straight to sometime sinuous, branched, oblique in relation to midvein, predominantly alternate and close to nearly distant; quaternary veins still fine with angle of origin nearly right angle, sometime branched and forming orthogonal to polygonal meshes.
