M423/K2-25, Kotui River & Kugda River Mouth, 3 km south of Kotuikan River Mouth (Cambrian of Russian Federation)

Where: Yakutiya, Russian Federation (71.0° N, 102.0° E: paleocoordinates 24.8° S, 6.5° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Nochoroicyathus sunnaginicus other zone, 4 Member (Medvezhyn Formation), Tommotian (525.5 - 521.0 Ma)

• Kouchinsky & Bengston (2002) and Kouchinsky (2000) suggest Medvezhyn formation. Rowland et al. imply Krasnoporog formation.

• group of beds-level stratigraphic resolution

Environment/lithology: lithified, gray, green, yellow limestone

• Platy gray-green, pale yellow limestones, often cavernous in the upper part of the member (Rozanov et al. 1969 p. 46).

Size classes: mesofossils, microfossils

Preservation: cast, replaced with phosphate

Collection methods: chemical

• Full description in Rozonav et al. 1969 p. 46

Primary reference: A. V. Kouchinsky. 2000. Shell microstructures in Early Cambrian molluscs. Acta Palaeontologica Polonica 45(2):119-150 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 96510: authorized by Pete Wagner, entered by Pete Wagner on 10.06.2010

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Helcionelloida
 Pelagiellida - Aldanellidae
Aldanella crassa
Aldanella crassa Rozanov et al. 1969
  - Ceratoconidae
Ceratoconus cf. rusticus