U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database
Geologic Units: Norian
Map showing publication footprint
  • Usage in publication:
    • Norian Stage
  • Modifications:
    • Biostratigraphic dating
Publication:

Krystyn, L., 1987, Zur Rhaet-stratigraphie in den Zlambach-Schichten (vorlaeufiger bericht) [Rhaetian stratigraphy in the Zlambach Beds; preliminary report]: Sitzungsberichten der Osterreichische Akademie der Wissenschaften Mathematisch-naturwissenschaftliche Klasse, v. 196, no. 1, p. 21-36.


Summary:

Revised definition and subdivision of the Rhaetian Stage is proposed based on ammonoids. Two ammonoid zones (each divisible into two subzones) are recognized. Ammonoid and conodont faunas are described and correlations discussed. Presence of the ammonoid Cochloceras indicates true Sevatian (Upper Norian) below the Rhaetian. Thus defined, the Norian-Rhaetian boundary is correlated with the lower part of the Koessen beds approximately between the Schwaebische and Karpatische Fazies. Base of the Koessen Formation is within the Upper Sevatian, and thus is not suitable as a chronostratigraphic boundary. Area of study in Austria.

Source: GNU records (USGS DDS-6; Denver GNULEX).


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).

Accessibility FOIA Privacy Policies and Notices

USA Gov U.S. Department of the Interior | U.S. Geological Survey
Supported by the National Cooperative Geologic Mapping Program
Page Contact Information: Personnel
Page Last Modified: Wed 12 Mar 2025 03:41:51 PM MDT