Locality J89105, small tributary of Hwangji River in Jangseong (Ordovician of South Korea)

Also known as Taebaeksan Basin

Where: Kangweondo (Gangwon-do), South Korea (37.1° N, 129.0° E: paleocoordinates 5.7° S, 132.6° E)

• coordinate stated in text

• hand sample-level geographic resolution

When: Jigunsan Formation (Taebaek Group), Llanvirn (468.0 - 458.4 Ma)

• The Jigunsan Formation (formerly spelled Chikunsan or Chigunsan Formation) is a subunit of the Taebaek Group and is Llanvirnian in age (see Kwon, 2005, Geosci. J. 9(4)).

• bed-level stratigraphic resolution

Environment/lithology: marine; shale

• The environments represented by the deposits of the Jigunsan Fm. range from deep-shelf/basinal in the transgressive/maximum flooding interval to shallow subtidal in the highstand interval (Woo & Chough, 2007, Geosci. J. 11(4)).
• "The Jigunsan Formation is a relatively thin (45-100 m in thickness) fossiliferous sequence of interbedded shale and subordinate limestone." (Niko, 2000, Paleont. Res. 6(1)). Fossils are said to come from shale.

Size class: macrofossils

Collection methods: surface (float),

• UMUT = University Museum of the University of Tokyo

Primary reference: S. Niko. 2002. Revision of an Ordovician Cephalopod Ormoceras yokoyamai (Kobayashi, 1927). Paleontological Research 6(1):121-124 [B. Kröger/T. Liebrecht]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 89539: authorized by Björn Kröger, entered by Torsten Liebrecht on 29.05.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Orthocerida - Proteoceratidae
Treptoceras yokoyamai
Treptoceras yokoyamai Kobayashi 1927
UMUT PM27828