GSC 25078, Thistle Creek [Opabin Mbr, Blackstone Fm] (Cretaceous of Canada)

Where: Alberta, Canada (52.8° N, 116.8° W: paleocoordinates 56.6° N, 75.1° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Inoceramus costellatus inoceramid zone, Opabin Member (Blackstone Formation), Middle Turonian (93.5 - 89.3 Ma)

• STRATIGRAPHIC RELATIONS: From the Opabin Mbr of the Blackstone Fm, which overlies the Haven Mbr of the Blackstone Fm and is overlain by the Cardium Fm. AGE: Late Turonian, on the basis of ammonoid and bivalve biostratigraphy; Prionocyclus woollgari/Inoceramud costellatus zone. STRATIGRAPHIC POSITION: From unit 8 within section 4-23.

• bed-level stratigraphic resolution

Environment/lithology: marine; concretionary shale

• ENVIRONMENT: Siliciclastic marine.
• SPECIFIC LITHOLOGY: Concretionary shales. LITHIFICATION: Not described in text.

Size class: macrofossils

Preservation: mold/impression

Reposited in the GSC

Collection methods: surface (in situ),

• COLLECTOR: Stott, c. 1960's. REPOSITORY: Geological Survey of Canada.

Primary reference: D. F. Stott. 1963. The Cretaceous Alberta Group and equivalent rocks, Rocky Mountain foothills, Alberta. Geological Survey of Canada Memoir 317:1-306 [A. Hendy/A. Hendy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 89211: authorized by Austin Hendy, entered by Austin Hendy on 10.05.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for marine invertebrates. NOMENCLATURE: An authoritative publication, and with relatively antiquated nomenclature but species-resolution identifications.
Cephalopoda
 Ammonitida - Collignoniceratidae
"Prionocyclus (Collignoniceras) sp." = Collignoniceras
"Prionocyclus (Collignoniceras) sp." = Collignoniceras Breistroffer 1947 ammonite
 Ammonitida - Scaphitidae
Scaphites patulus Cobban 1951 ammonite
Bivalvia
 Myalinida - Inoceramidae
Inoceramus lamarcki Parkinson 1819 clam
SUBSPECIES: Inoceramus lamarcki fragilis
"Inoceramus aff. cordiformis" = Cordiceramus cordiformis Sowerby 1823 clam
Inoceramus fragilis Hall and Meek 1856 clam
Inoceramus costellatus Woods 1904 clam
 Ostreida - Pteriidae
Pteria sp. Scopoli 1777 pearl oyster