NE Richardson Mountains (from 750-790 ft of upper shale-siltstone division) (Cretaceous of Canada)

Where: Yukon, Canada (68.2° N, 137.0° W: paleocoordinates 66.8° N, 52.1° W)

• coordinate based on nearby landmark

• basin-level geographic resolution

When: Barremian (129.4 - 125.0 Ma)

• STRATIGRAPHIC RELATIONS: From the "upper shale-siltstone division" of an unnamed lithostratigraphic unit, for which lithostratigraphic relations are not discussed. AGE: Valanginian, on the basis of ammonite biostratigraphy; Crioceras remondi zone. STRATIGRAPHIC POSITION: List is representative of this zone; upper 750-790 ft.

• formation-level stratigraphic resolution

Environment/lithology: marine; lithified siliciclastic sediments

• ENVIRONMENT: Not stated in text, but apparently marine siliciclastic.
• SPECIFIC LITHOLOGY: Not reported, but apparently siliciclastic. LITHIFICATION: Lithified, assumed.

Size class: macrofossils

Preservation: mold/impression

Reposited in the GSC

Collection methods: surface (in situ),

• COLLECTOR:Unknown. REPOSITORY: Presumably the Geological Survey of Canada (GSC).

Primary reference: J. A. Jeletzky. 1968. Macrofossil zones of the marine Cretaceous of the Western Interior of Canada and their correlation with the zones and stages of Europe and the Western Interior of the United States. Geological Survey of Canada Paper 67(72):1-66 [A. Hendy/A. Hendy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 87408: authorized by Austin Hendy, entered by Austin Hendy on 17.03.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Limited to characteristic ammonoidea and bivalvia. NOMENCLATURE: Not an authoritative publication but with relatively modern nomenclature and species-resolution identifications.
Bivalvia
 Pectinida - Buchiidae
Cephalopoda
 Belemnitida - Belemnitidae
 Ammonitida - Oppeliidae
Aconeceras sp. Hyatt 1903 ammonite
 Ammonitida - Ancyloceratidae
 Ammonitida - Acrioceratidae
"Crioceras (Hoplocrioceras) cf. remondi" = Hoplocrioceras remondi, "Ancyloceras (Acrioceras) aff. starrkingi" = Toxoceratoides starrkingi
"Crioceras (Hoplocrioceras) cf. remondi" = Hoplocrioceras remondi Gabb 1864 ammonite
"Ancyloceras (Acrioceras) aff. starrkingi" = Toxoceratoides starrkingi Anderson 1938 ammonite
 Ammonitida - Crioceratitidae
"Crioceras (Crioceras) cf. latum" = Crioceratites latus, "Crioceras (Hoplocrioceras) aff. laeviusculum" = Crioceratites, "Crioceras (Shasticrioceras) sp." = Crioceratites
"Crioceras (Crioceras) cf. latum" = Crioceratites latus Gabb 1864 ammonite
"Crioceras (Hoplocrioceras) aff. laeviusculum" = Crioceratites ammonite
"Crioceras (Shasticrioceras) sp." = Crioceratites Leveillé 1837 ammonite