Tsagaan Del Unit 2. Right bank of Buriduin-Gol River, 4 km NE of Bor-kuduk well (Ordovician of Mongolia)

Also known as Reef 2668; Tsagan-Del

Where: Bayanhongor, Mongolia (46.4° N, 100.3° E: paleocoordinates 27.3° N, 20.5° E)

• coordinate estimated from map

• small collection-level geographic resolution

When: Pleurograptus linearis graptolite zone, Lower Member (Tsagaan Del Formation), Katian (453.0 - 445.2 Ma)

• unit 2, 12 m thick. However, Rozman & Minzin (1980) give it as 10 meters. Chakyr or Chakyrii stage locally.

• bed-level stratigraphic resolution

Environment/lithology: reef, buildup or bioherm; lithified limestone

• Bolshakova & Ulitina 1985: reef-like limestone lens intercalated in sandstones.

•Rozman & Minzhin 1980: Grey pelitomorphic, medium-laminated, compact (they form the high ridge recognizable in relief), organogenic limestones: individual intercalations are packed with gastropods, with scarce remains of tabulate corals; eastward along the strike, these coral-gastropod limestones are replaced by sandy brachiopod limestones with sandstone seams.

Size class: macrofossils

Collection methods: peel or thin section,

Primary reference: L. N. Bolshakova and L. M. Ulitina. 1985. Stromatoporaty i biostratigrafiya nizhnego paleozoya Mongolii [Stromatoporata and biostratigraphy of the Lower Paleozoic of Mongolia]. Trudy Sovmestnaya Sovetsko-Mongolskaya Paleontologicheskaya Ekspeditisiya [Transactions of the Joint Soviet-Mongolian Paleontological Expedition] 27:5-94 [W. Kiessling/U. Merkel]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 79589: authorized by Wolfgang Kiessling, entered by Uta Merkel on 14.03.2008, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Stromatoporoidea
 Clathrodictyida - Clathrodictyidae
Clathrodictyon vormsiense Riabinin 1951 stromatoporoid sponge
 Labechiida - Rosenellidae
Cystostroma fritzae stromatoporoid sponge
Anthozoa
 Tabulata -
Tabulata indet. Milne-Edwards and Haime 1850 tabulate coral
 Lichenariida - Lyoporidae
 Tabulata -
Heliolitida indet. Frech 1897 tabulate coral
 Heliolitida - Halysitidae
 Stauriida - Stauriidae
 Stauriida - Streptelasmatidae
Grewingkia contexta Neuman 1969 horn coral
Brachiopoda
  -
Brachiopoda indet. Cuvier 1805
Strophomenata
 Orthotetida - Triplesiidae
"Epacroplecia acuminata" = Craigella
"Epacroplecia acuminata" = Craigella
 Strophomenida - Rafinesquinidae
Leptaena praequalis Rozman 1977
 Strophomenida - Strophonellidae
 Strophomenida - Furcitellidae
Rhynchonellata
 Orthida - Hesperorthidae
"Hesperorthis laticostata" = Hesperorthis latecostata Rozman 1977
 Rhynchonellida - Trigonirhynchiidae