Tsagaan Del Unit 5. 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: Dicellograptus complanatus graptolite zone, Middle Member (Tsagaan Del Formation), Katian (453.0 - 445.2 Ma)

• Bolshakova and Ulitina 1985 give as unit 5, 30 m thick.

•Diyetken stage in Mongolia.

• bed-level stratigraphic resolution

Environment/lithology: reef, buildup or bioherm; lithified, medium-grained, shelly/skeletal, gray limestone

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

•Rozman & Minzhin 1980: Dark-gray, medium-grained, compact, coral-brachiopod limestones

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 79590: authorized by Wolfgang Kiessling, entered by Uta Merkel on 14.03.2008, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

Brachiopoda
  -
Brachiopoda indet. Cuvier 1805
Rhynchonellata
 Rhynchonellida -
Togaella ex gr. salairica2
Togaella salairica latecostellata
 Orthida - Hesperorthidae
Strophomenata
 Strophomenida - Strophomenidae
Strophomena "sp. nov."2 Rafinesque and De Blainville 1824
Bryozoa
  -
Bryozoa indet. Ehrenberg 1831
Anthozoa
 Stauriida - Streptelasmatidae
Streptelasma duncani Dybowski 1873 horn coral
Grewingkia anguinea Scheffen 1933 horn coral
 Tabulata -
Tabulata indet. Milne-Edwards and Haime 1850 tabulate coral
Heliolitida indet. Frech 1897 tabulate coral
 Heliolitida - Sibiriolitidae
 Heliolitida - Proheliolitidae
 Heliolitida - Halysitidae
Halysites proecedens2 tabulate coral
Stromatoporoidea
 Clathrodictyida - Clathrodictyidae
Clathrodictyon microundulatum Nestor 1964 stromatoporoid sponge
Clathrodictyon vormsiense Riabinin 1951 stromatoporoid sponge
 Labechiida - Labechiidae
"Tuvaechia regularis" = Labechiella, Labechia huronensis
"Tuvaechia regularis" = Labechiella stromatoporoid sponge
Labechia huronensis Billings 1865 stromatoporoid sponge
 Labechiida - Rosenellidae
Pachystylostroma woyuensis stromatoporoid sponge
Pachystylostroma ozakii n. sp. Bolshakova and Ulitina 1985 stromatoporoid sponge
Cystostroma fritzae stromatoporoid sponge