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Semecarpus oligocenicus
Semecarpus oligocenicus G. Srivast., R.C. Mehrotra Curr. Sci., 102(3): 399. 10 Feb 2012
- Name
- Semecarpus oligocenicus
- Rank
- Species
- Generic Name
- [Genus] Semecarpus
- Authors (Pub.)
- Srivastava G.
Mehrotra R. C.
- Publication
- The oldest fossil of Semecarpus L.f. from the Makum Coalfield, Assam,
India and comments on its origin [2012/2]
- Journal
- Current Science
- Volume
- 102
- Issue
- 3
- Page number
- 399
- Year
- 2012
- Fossil Status
- leaves
- Stratigraphy
- Chattian
- Strat. comment
- Tikak Parbat Formation
- Location
- Tirap Colliery, Tinsukia District, Assam, India (27°17′20″N, 95°46′15″E)
- Paleoregion
- Eurasia (Indostan)
Data for Holotypus
- Repository
- Birbal Sahni Institute of Palaeosciences, Lucknow, India
- Repository Number
- BSIP 39905
- Diagnosis
- Leaf nearly complete, symmetrical, mesophyll, very narrow elliptic; preserved lamina length 24 cm (estimated lamina length 35 cm), maximum preserved width 8.2 cm (estimated lamina width 11 cm) near the middle position; apex broken; base broken; margin entire; texture chartaceous; venation pinnate, eucamptodromous; primary vein stout and straight; secondary veins nine
pairs visible, 1.8–2.4 cm apart, alternate, angle of divergence wide acute to right angle (68°–98°), for the most part straight but turning up sharply near the margin, moderately thick; intersecondary veins present, simple; tertiary veins percurrent, forked, straight, alternate–opposite, angle of origin AA–AO; marginal ultimate venation fimbriate; areoles imperfect, random, predominantly quadrangular in shape; veinlets branched.
