The genus Pseudotorellia Florin (Ginkgoales): Taxonomic and stratigraphic aspects |
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| Authors: | A I Kiritchkova N V Nosova |
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| Institution: | 1. All-Russia Petroleum Research Exploration Institute (VNIGRI), St. Petersburg, Russia
2. Komarov Botanical Institute, Russian Academy of Sciences, St. Petersburg, Russia
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| Abstract: | The history of investigation of the common Jurassic and Cretaceous genus Pseudotorellia Florin (Ginkgoales) represented by needle-shaped, narrow linear or lanceolate leaves bearing several veins and characterized
by a single type of epidermis, is considered. An extended diagnosis of the genus and its taxonomic composition with regard
to the epidermal characters are reported; the stratigraphic and geographical range of its species and the genus evolution
are refined. Three new species Pseudotorellia asiatica N. Nosova et Kiritchkova, sp. nov., P. ketoviana N. Nosova et Kiritchkova, sp. nov., and P. samylinae N. Nosova et Kiritchkova, sp. nov. described from the Lower Jurassic (Toarcian) sediments, are proposed as the correlative
taxa within the Caspian oil and gas province. The stratotype and reference sections of the Lower Jurassic sediments in the
Mangyshlak Mountains are reported for the first time. |
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