Gurvan-Ereny-Nuruu (Outcrop 234/39) (VNIGRI collection 975) (Cretaceous of Mongolia)

Where: Govi-Altai, Mongolia (46.4° N, 94.1° E: paleocoordinates 46.1° N, 93.9° E)

• coordinate based on political unit

• outcrop-level geographic resolution

When: Gurvan-Eren Formation, Aptian (125.0 - 113.0 Ma)

• Bed 39 is equivalent to bed 4 in outcrop 235 and bed 5 in outcrop 236. Correlated with Bon Tsagaan based on pollen and plants.

Environment/lithology: lacustrine - large; siltstone and calcareous sandstone

• Marker cycle. At the base of fine-grained calcareous sandstone brown (5-10 cm) with open shells ... bivalves, gastropods ..... ostracods .... caddis houses ... Top cyclites compose siltstone (1, 2 M) grayish-bluish to greenish, from the bottom up layer observed buried on bedding planes Conchostracans wing, single houses and caddis ostracods (bottom 20 cm) above the massive greenish siltstones found isolated small gastropods ...

Size classes: macrofossils, mesofossils

Preservation: mold/impression

Reposited in the PIN

Primary reference: S. M. Sinitsa. 1986. Ostracoda, in Nasekomye v rannemelovykh ekosistemakh zapadnoy Mongolii. In A. P. Rasnitsyn (ed.), The Joint Soviet-Mongolian Palaeontological Expedition 28:174-178 [M. Clapham/J. Karr/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 136203: authorized by Matthew Clapham, entered by Jered Karr on 22.11.2012

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Insecta
 Trichoptera -
Ostracindusia modesta Sukacheva 1982 caddisfly
Ostracoda
  -
Darwinula contracta Mandelstam 1955 ostracod
 Podocopida - Cyprididae
Cypridea sp. Bosquet 1852 ostracod
Cypridea gurvanensis Sinitsa 1986 ostracod
Bivalvia
 Cardiida - Limnocyrenidae
Limnocyrena sp. Martinson 1961 clam
 Unionida - Unionidae
Unio sp. Philipsson 1788 freshwater mussel
Gastropoda
 Rissooidea - Bithyniidae
Bithynia sp. Leach 1818 snail
 Valvatoidea - Valvatidae
Valvata sp. Müller 1774 snail