Boyarka River, bed 42 (Cretaceous of Russian Federation)

Where: Russian Federation (70.6° N, 97.3° E: paleocoordinates 70.6° N, 81.5° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Bidichotomus ammonoid zone, Late/Upper Valanginian (140.2 - 136.4 Ma)

• Triplodiptychus subzone

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified shale

Size class: macrofossils

Collected by Bogomolov in 1981

Primary reference: Y. I. Bogomolov. 1989. Poliptikhity (Ammonity) i biostratigrafiya boreal'nogo Valanzhina. Akademiya Nauk SSSR, Sibirskoe Otdelenie Trudy Instituta Geologii I Geofiziki 696:1-199 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 189662: authorized by Matthew Clapham, entered by Matthew Clapham on 04.11.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

 Ammonitida - Polyptychitidae
"Polyptychites (Dichotomites) bidichotomus" = Dichotomites (Dichotomites) bidichotomus d'Orbigny 1841 ammonite