Taebaeksan Basin, Tongjom section SE Taebaek H10 (Ordovician of South Korea)

Where: South Korea (37.2° N, 129.0° E: paleocoordinates 0.1° N, 140.2° E)

• coordinate estimated from map

When: Asaphellus trilobite zone, Tumugol Formation, Tremadocian (485.4 - 477.7 Ma)

• Part of the Choson Supergroup...

•...it measures ca. 120 m in thickness, including a 57-m-thick concealed portion at the base and represents approximately the lower two-thirds of the Tumugol Formation.

Environment/lithology: calcareous shale

• The sediments are thought to have been deposited on a shallow ramp, strongly

•influenced by storm activities.

• The Tumugol Formation at the section comprises shale, calcareous shale, nodular limestone, lime mudstone, grainstone to packstone, and limestone conglomerate.

Size class: mesofossils

• specimens are small rectangular elements (2-10mm long), displaying a great morphological variability. This variability raises the questions of the presence of several morphotypes in the Korean material, possibly related to the co-occurrence of different species or to a possible asymmentry between left and right adorals (as in some other kirkocystids).

Preservation: mold/impression

Collection methods: Skeletal elements of kirkocystid mitrates were collected from the Asaphellus Zone of the section...

Primary reference: S.-B. Lee, B. Lefebvre, and D.K. Choi. 2004. Morphometric analysis of Tremadocian (earliest Ordovician) kirkocystid mitrates (Echinodermata, Stylophora) from the Taebaeksan Basin, Korea. Geobios 37:731-748 [B. Seuss/B. Seuss/B. Seuss]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 215851: authorized by Barbara Seuss, entered by Barbara Seuss on 26.11.2020

Creative Commons license: CC BY (attribution)

Taxonomic list

• ..., which yields trilobites (Asaphellus coreanicus, A. tomkolensis, Hystricurus sp.), brachiopods (Lingulella sp., Eoorthis sp.), echinoderms (isolated plates of stylophorans, pelmatozoan stems), Sphenothallus, and Plumulites (Choi and Lee, 1988; Choi and Kim, 1989; Choi, 1990).
Show authors, comments, and common names
unclassified
  -
Echinodermata indet., Pelmatozoa indet.
Pelmatozoa indet. Leuckart 1848
Polychaeta
  -
Sphenothallus sp., Plumulites sp.
Plumulites sp. Barrande 1872 scale worm
Lingulata
 Lingulida - Obolidae
Lingulella sp.
Lingulella sp. Salter 1866
Rhynchonellata
 Orthida - Eoorthidae
Eoorthis sp.
Eoorthis sp. Walcott 1908
Trilobita
 Proetida - Hystricuridae
Hystricurus sp.
Hystricurus sp. Raymond 1913 trilobite
 Asaphida - Asaphidae
Asaphellus coreanicus, Asaphellus tomkolensis