Exine ultrastructure in pollen grains of Classopollis Pflug from the Cretaceous of Lebanon

Autor:	Natalia Zavialova, S. B. Smirnova, M. Mroueh, M. V. Tekleva
Rok vydání:	2010
Předmět:	Palynology biology Paleontology biology.organism_classification medicine.disease_cause Cretaceous Cheirolepidiaceae Pollen Botany Ultrastructure medicine Assemblage (archaeology) Geology
Zdroj:	Paleontological Journal. 44:1353-1367
ISSN:	1555-6174 0031-0301
DOI:	10.1134/s0031030110100126
Popis:	Pollen grains of Classopollis Pflug from the Cretaceous deposits of Lebanon were studied by means of light and electron microscopy. Ultrastructurally, they are similar to pollen grains, extracted from Classostrobus comptonensis Alvin, Spicer et Watson from the Barremian of England. The differences concern the shape and size of spinules, ultrastructure of apertural regions, and preservation of the endexine. An analysis of our data and published results revealed three types of infratectum existed in members of Circumpolles: (1) with branchy elements, (2) with columella-like non-branching elements, and (3) with large granules arranged in one row. The palynological assemblage is described in detail; problems of dating are discussed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2606ffa9d3b3ab076a1a63030eaed743 https://doi.org/10.1134/s0031030110100126 Zobrazit plný text záznamu Full text from SpringerLink