Middle Toarcian Ammonitina from the Gerecse Mts, Hungary

Barnabás Géczy; István Szente

doi:10.1556/ageol.49.2006.3.3

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Acta Geologica Hungarica

Volume/Issue:: Volume 49: Issue 3

Middle Toarcian Ammonitina from the Gerecse Mts, Hungary

Authors:

Barnabás Géczy

Barnabás Géczy
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István Szente

István Szente
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Pages:: 223–252

Online Publication Date:: 15 Jun 2007

Publication Date:: 01 Sep 2006

Article Category:: Research Article

DOI:: https://doi.org/10.1556/ageol.49.2006.3.3

Keywords:: Hungary; Ammonoidea; Gerecse Mts; biostratigraphy; Jurassic; Toarcian

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In the Gerecse Mts, Jurassic successions built of sedimentary rocks characteristic of the peri-Mediterranean region are found. The lower part of the Toarcian stage, largely representing the "Ammonitico Rosso marl" facies, contains very diverse and abundant ammonite faunas. Bed-by-bed sampling of four sections carried out during the late seventies and early eighties of the last century has resulted in the collection of more than 15 000 specimens, the bulk of them belonging to the orders Phylloceratina and Lytoceratina. Due to the presence of very rare index forms of the suborder Ammonitina, the successions could be fitted into the zonal scheme established for the NW European Toarcian. The aim of the present paper is to provide information on the stratigraphic distribution of Ammonitina in the Bifrons and Gradata Zones as well as to present a subzonal subdivision of these beds.

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Acta Geologica Hungarica

Print ISSN:: 0236-5278

Online ISSN:: 1588-2594

Acta Geologica Hungarica
Language	English
Size
Year of Foundation	1952
Publication Programme	changed title
Volumes per Year
Issues per Year
Founder	Magyar Tudományos Akadémia
Founder's Address	H-1051 Budapest, Hungary, Széchenyi István tér 9.
Publisher	Akadémiai Kiadó
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-5278 (Print)
ISSN	1588-2594 (Online)