Where: Russian Federation (75.6° N, 135.6° E: paleocoordinates 24.5° N, 14.5° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Nerpalakh Formation, Early/Lower Frasnian (383.7 - 382.4 Ma)

• Basal layers of bed 2. Mass accumulations of well-preserved shells are found in the upper part of the massive black limestone and in the lower part of the zone of the lens-shaped alternation of the black carbonaceous limestone and carbonaceous shale. The thickness of the ammonoid-bearing layer is less than 0.5 m.

• bed-level stratigraphic resolution

Environment/lithology: lithified, black limestone

Size class: macrofossils

Collected by A.B. Kuzmichev in 2002; reposited in the PIN

Primary reference: S. V. Nikolaeva, A. B. Kuzmichev, and V. A. Aristov. 2009. On Frasnian ammonoids of the New Siberian Islands. Paleontological Journal 43:134-141 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 170867: authorized by Matthew Clapham, entered by Matthew Clapham on 27.06.2015

Creative Commons license: CC BY (attribution)