|ID||Michel: 1568-1571 Scott: Stanley Gibbons: Yvert: UPU: N/A Category: pF|
|Stamps in set||4|
|Value||10 Williamsonia sewardiana
2 Birbalsahnia divyadarshanii
|Size (width x height)|
|Products||FDC x 1|
|Issuing Authority||Indian Post|
Professor Birbal Sahni was the first Indian to revitalize study of Indian fossil plants.
A model of the extinct plant Williamsonia sewardiana which thrived in Rajmahal, Bihar about 140 million years ago. This model is based on the reconstruction envisaged by Prof. Birbal Sahni. Originally described as Zamia gigas by William Crawford Williamson. William Carruthers proposed the name Williamsonia in an 1870 paper of his, with the type species being Williamsonia gigas
An e Fossilized specimens of Williamsonia have been discovered worldwide.Pentoxylon - An important discovery of Prof. Birbal Sahni is the extinct plant group named Pentoxylae from Nipania in Dumka district, Rajmahal Hills, Bihar (age 110-114 million years). Reconstruction of plant with leaves, stem, flowers. Pentoxylon takes its name from the five wedges of wood that characterize its stem. Pentoxylon is a Gondwanan taxon, which has been found in India, Australia and New Zealand. Pentoxylon first appears in the later part of the Paleozoic, but its greatest diversity and abundance appears to be in the Jurassic, continuing into the Early Cretaceous.
Glossopteris - The tongue-shaped leaf Glossopteris, represents a unique group of extinct vascular plants (age : Permian, 250-280 million years). During this period India occupied a position south of equator close to South Pole as a part of a very large continent which included South America, Antarctica, Africa and Australia, called Gondwanaland. This vegetation was responsible for the precious coal reserves in peninsular India.Birbalsahnia divyadarshanii - Fossil of an enigmatic flower-like organ of the extinct plant named after eminent Indian Palaeobotanists - Prof. Birbal Sahni and Prof. Divya Darshan Pant, discovered from Hura Coalfield, Santhal Pargana, Bihar (age 250-280 million years).
|FDC (back side of the cover is here)||Circulated cover (the cover sent from Lucknow city in 2013)|
Latest update 30.10.2017
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