Also known as Maggol, Makgol, Sangdong; Taebaeksan Basin
Where: Kangwon-do, South Korea (37.2° N, 128.7° E: paleocoordinates 5.8° S, 132.4° E)
• coordinate estimated from map
• outcrop-level geographic resolution
When: Jigunsan Formation (Taebaek Group), Llanvirn (468.0 - 458.4 Ma)
• Upper Abereiddian (Darwillian) (Kobayashi)
•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)). No particular horizons are given for the specimens listed (TL).
•Formation was originally entered as >> Chikunsan << . Since this is the old spelling it was corrected (see, e.g., Kwon, 2005) and name of the group was added (TL).
•Chronostratygraphy was originally entered as >> Early/Lower Llandeilo << and was changed to >> Llanvirn << according to more recent publications (e.g., Yu, 1999; Kwon, 2005) which give the Llanvirnian age based on Conodont data.
• member-level stratigraphic resolution
Environment/lithology: marine; shale and limestone
•Environment was originally entered as >> carbonate indet. << .
•Tectonic setting was added. (TL)
•Primary lithology originally was entered as >> "limestone" << and was made the secondary lithology. >> "shale" << was added as primary lithology and both boxes were checked (TL).
Size class: macrofossils
Collection methods: UMUT = University Museum of the University of Tokyo (TL)
•Box for "survey of museums collection" was additionally checked (refers to the more recent papers). (TL)
Primary reference: T. Kobayashi. 1934. The Cambro-Ordovician formations and faunas of south Chosen. Paleontology. Part I. Middle Ordovician faunas. Journal of the Faculty of Science, the Imperial University of Tokyo, Section 2 3(8):335-519 [P. Wagner/P. Wagner]more details
Purpose of describing collection: general faunal/floral analysis
PaleoDB collection 56171: authorized by Pete Wagner, entered by Pete Wagner on 14.11.2005, edited by Torsten Liebrecht and Bethany Allen
Creative Commons license: CC BY (attribution)
Taxonomic list
Strophomenata | |
Rhynchonellata | |
Bivalvia | |
? Nuculites suboblongatus Kobayashi 1934 clam | |
"Ctenodonta samenoha" = Palaeoconcha samenoha
"Ctenodonta samenoha" = Palaeoconcha samenoha Kobayashi 1934 clam | |
Ctenodonta nipponica Kobayashi 1934 clam
Ctenodonta oblongata Kobayashi 1934 clam
Ctenodonta coreanica Kobayashi 1934 clam | |
Modiolopsis reedi Kobayashi 1934 clam
Modiolopsis hinomotoensis Kobayashi 1934 clam
Modiolopsis kogenensis Kobayashi 1934 clam | |
Cephalopoda | |
Endoceras alticameratum, Cyclendoceras orientale, Vaginoceras neichiaense, Kotoceras typicum, Kotoceras cylindricum, Kotoceras multiseptum, "Vaginoceras grabaui n. sp." = Kotoceras grabaui, "Vaginoceras frechi n. sp." = Kotoceras grabaui
"Vaginoceras grabaui n. sp." = Kotoceras grabaui Kobayashi 1927 originally entered as "Kotoceras grabaui"; UMUT PM631 (lectotype); number of additional specimens (at least the additional former syntypes) is not stated in Yun (1999)
"Vaginoceras frechi n. sp." = Kotoceras grabaui Kobayashi 1927 originally entered as "Kotoceras frechi"; UMUT PM3 (type)
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"Orthoceras coreanicum n. sp." = Holmiceras coreanicum4, "Holmiceras coreanicum" = Holmiceras coreanicum4
"Orthoceras coreanicum n. sp." = Holmiceras coreanicum4 Kobayashi 1927 UMUT PM8 (paralectotype), PM9 (hololectotype), PM651
"Holmiceras coreanicum" = Holmiceras coreanicum4 Kobayashi 1927 UMUT PM7 (former syntype of Orthoceras makkolense)
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"? Ooceras tokunagai n. sp." = Centroonoceras tokunagai3, Sactorthoceras gonioseptum n. sp.4, "Orthoceras makkolense n. sp." = Sactorthoceras makkolense4, "Sigmorthoceras sigmoidale n. sp." = Sactorthoceras makkolense4, "Sactorthoceras shimamurai n. sp." = Sactorthoceras makkolense4, "Cycloceras taihakuense n. sp." = Sactorthoceras makkolense4, "Kawasakiceras densistriatum n. gen. n. sp." = Sactorthoceras makkolense
"Cycloceras taihakuense n. sp." = Sactorthoceras makkolense4 Kobayashi 1927 UMUT PM657, PM658 (both are paratypes), PM659 (holotype)
"Kawasakiceras densistriatum n. gen. n. sp." = Sactorthoceras makkolense Kobayashi 1927 originally entered as "Kawasakiceras densistriatum"; UMUT PM 634 (type)
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Gastropoda | |
Helicotoma sp. Salter 1859 snail | |
"Joleandella sigmoidalis" = Joleaudella sigmoidalis2
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Lophospira pagoda Kobayashi 1930 snail | |
Polychaeta | |
Plumulites chikunensis scale worm | |
Pterobranchia | |
Diplograptus perexcavatus graptolite |