DuoQuanShan Fm., ShiHuiGou and DaCaiDan Counties, QingHai Prov., China (Ordovician of China)

Where: QingHai, China (38.0° N, 95.0° E: paleocoordinates 38.0° N, 95.0° E)

• local area-level geographic resolution

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

• formation-level stratigraphic resolution

Environment/lithology: marine; lithified, concretionary, gray, argillaceous limestone and chert

• light gray limestone with chert at top and nodular dark and muddy limestone at bottom

Primary reference: Stratigraphic Group of Quing Hai Province. 1980. Regional stratigraphic tables of the north western China region: Volume of NinXia Province. Geological Publishing House, Beijing, China [A. Miller/P. Novack-Gottshall]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 8687: authorized by Arnold Miller, entered by Phil Novack-Gottshall on 24.08.2000

Creative Commons license: CC BY (attribution)

Taxonomic list

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Pterobranchia
 Graptoloidea - Isograptidae
Isograptus sp.
Isograptus sp. Moberg 1892 graptolite
 Graptoloidea - Glossograptidae
Glossograptus sp.
 Graptoloidea - Phyllograptidae
Phyllograptus sp.
Phyllograptus sp. Hall 1858 graptolite
 Graptoloidea - Dichograptidae
Didymograptus sp.
Didymograptus sp. McCoy 1851 graptolite
 Graptoloidea - Retiolitidae
Glyptograptus sp.
Cephalopoda
 Endocerida - Endoceratidae
Cameroceras sp.
Cameroceras sp. Conrad 1842
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Gastropoda
 Murchisoniina - Hormotomidae
Hormotoma sp.
Hormotoma sp. Salter 1859 snail
Malacostraca
 Archaeostraca - Caryocarididae
Caryocaris sp.
Caryocaris sp. Salter 1863
Artiopoda
 Agnostida - Metagnostidae
Geragnostus sp.
Geragnostus sp. Howell 1935
Trilobita
 Corynexochida - Styginidae
Stygina sp.
Stygina sp. Salter 1853 trilobite
 Corynexochida - Leiostegiidae
"Bathyuriscops sp." = Annamitella
"Bathyuriscops sp." = Annamitella Mansuy 1920 trilobite
 Corynexochida - Illaenidae
Illaenus sp.
Illaenus sp. Dalman 1827 trilobite
 Phacopida - Encrinuridae
Encrinuroides sp.
Encrinuroides sp. Reed 1931 trilobite
 Phacopida - Pliomeridae
Pliomerops sp.
Pliomerops sp. Raymond 1905 trilobite
 Trinucleida - Raphiophoridae
Endymionia sp., Lonchodomas sp.
Endymionia sp. Billings 1865 trilobite
Lonchodomas sp. Angelin 1854 trilobite
 Asaphida - Nileidae
Nileus sp., Symphysurus sp.
Nileus sp. Dalman 1827 trilobite
Symphysurus sp. Goldfuss 1843 trilobite