Numismalis marl formation

Lithostratigraphy of the South German Jura .
Abbreviations:

Humph.-Fm. = Humphriesioolite Formation

L.Bk-Fm = Lying bench lime formation

H.Bk-Fm = hanging bank lime formation

Zm-Fm = cement marl formation

S.-Fm = Solnhofen formation

Rö.-Fm = Rögling formation

U.-Fm = Usseltal formation

Mö.-Fm = Mörnshein formation

N.-Fm = Neuburg formation

R.-Fm = Rennertshofen formation

Numismalis marl with loafstone-like limestone banks on the Krettenbach near Birenbach in the foothills of the Alb

The Numismalis marl formation is a lithostratigraphic formation in the southern German Jura region (Swabian Alb, Upper Rhine Graben, Alpine Foreland). It is overlaid by the Amaltheenton Formation and underlain by the Obtususton Formation . In Franconia and eastern Baden-Wuerttemberg underneath lies the Gryphaeensandstein Formation . The Numismalis marl formation is dated to the Pliensbachian . It reaches a thickness of up to 13 m.

history

The lithological unit Numismalis marl formation was proposed by Friedrich August Quenstedt in 1843. Quenstedt derives the name from the frequently occurring brachiopod species "Terebratula numismalis" (= Cincta numismalis ). It corresponds to the Schwarzjura gamma of the Quenstedt structure. In the Stratigraphic Table of Germany it is then defined as a formation.

definition

The Numismalis marl formation consists of alternating layers of marls , marl limestone and individual limestone banks. The thickness is 13 m in the central part of Baden-Württemberg and is reduced to 1 to 2 m in the Wutach area and in the southern Upper Rhine area as well as in East Württemberg. The lower limit is the Cymbia Bank, the upper limit is the upper limit of the intermediate limestone. The Numismalis marl formation is dated in the lower and in the upper Unterpliensbachium. The formation includes at most the ammonite zones (from the lying to the hanging wall ): Uptonia jamesoni , Tragophylloceras ibex and Prodactylioceras davoei . The key abbreviation of the State Office for Geology, Raw Materials and Mining (Baden-Württemberg) for the Numismalis marl formation in geological maps is pb1.

Breakdown

The Numismalis marl formation is divided into the lower and upper Numismalis marl (or intermediate limestone). At the base of the lower Numismalis marl is the Cymbia Bank, at the top the Davoei Bank.

literature

• Friedrich August Quenstedt: The Flözgebirge Wuerttemberg. Laupp Publishing House, Tübingen 1843.
• Friedrich August Quenstedt: The Jura. Laupp Publishing House, Tübingen 1856–57.
• Gert Bloos, Gerd Dietl & Günter Schweigert: The Jura of Southern Germany in the Stratigraphic Table of Germany 2002. Newsletter on Stratigraphy, 41 (1-3): 263-277, Stuttgart 2005 ISSN  0078-0421
• Eckhard Mönnig: The Jura of Northern Germany in the Stratigraphic Table of Germany 2002. Newsletters on Stratigraphy, 41 (1-3): 253-261, Stuttgart 2005 ISSN  0078-0421

Web links

• German Stratigraphic Commission (Ed.): Stratigraphische Tisch von Deutschland 2002 . Potsdam 2002, ISBN 3-00-010197-7 , PDF; 6.57  (large)
• Geological overview of the sequence of layers in Baden-Württemberg (PDF; 831 kB)
• Lower Jurassic in Baden-Württemberg ( Memento from September 15, 2011 in the Internet Archive ) (PDF; 12 kB)
• Lias gamma ( Memento from November 29, 2014 in the Internet Archive )

Individual evidence

1. ↑ FA Quenstedt: The Flözgebirge Würtembergs: with special regard to the Jura. 558 p., Tübingen, 1843. (digitized version)