Units 1 to 4, Dawan Fm., Yangjiaba, Chengkou County, Sichuan Prov., China (Ordovician of China)

Where: Sichuan, China (32.0° N, 108.0° E: paleocoordinates 15.5° N, 141.5° E)

• local area-level geographic resolution

When: Dawan Formation, Arenig (478.6 - 466.0 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: shallow subtidal; lithified, silty shale and limestone

• shale, limestone and siltstone

Primary reference: Sichuan Stratigraphic Work Group. 1978. Regional stratigraphic table of the southwestern region of China, Sichuan part. Geological Publishing House, Beijing, China [A. Miller/P. Novack-Gottshall]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 7649: authorized by Arnold Miller, entered by Phil Novack-Gottshall on 30.05.2000

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Trilobita
 Asaphida - Taihungshaniidae
Taihungshania sp. Sun 1931 trilobite
 Asaphida - Asaphidae
Psilocephalina sp. Hsu 1948 trilobite
Megalaspides sp. Brögger 1886 trilobite
 Trinucleida - Trinucleidae
Ningkianolithus sp. Lu 1954 trilobite
Hanchungolithus sp. Lu 1956 trilobite
 Phacopida - Calymenidae
Neseuretus sp. Hicks 1873 trilobite
Rhynchonellata
 Orthida - Orthidae
Cephalopoda
 Ellesmerocerida - Protocycloceratidae
 Endocerida - Endoceratidae
Chisiloceras sp. Gortani 1934
Pterobranchia
 Graptoloidea - Dichograptidae
Didymograptus sp. McCoy 1851 graptolite
Azygograptus sp. Nicholson and Lapworth 1875 graptolite
 Graptoloidea - Phyllograptidae
Phyllograptus sp. Hall 1858 graptolite