GSC 94026, Murray Ridge Fm, Jurassic Butte, Northwest Territories (Jurassic of Canada)

Where: Northwest Territories, Canada (68.0° N, 135.4° W: paleocoordinates 52.2° N, 58.8° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Murray Ridge Formation (Bug Creek Group), Sinemurian (199.3 - 190.8 Ma)

• collection from a 0.6 m thick recessive bed 2.5-3 m above base of the Jurassic; this overturned section was previously described by Jeletzky (1967), Sec. 24, p. 102-104, Pl. 6, fig. 1)

• bed-level stratigraphic resolution

Environment/lithology: marine; shale and siltstone

• Table 1 gives broad lithological descriptions of formations within the study area. The Murray Ridge Fm is predominantly shale and siltstone.

Size class: macrofossils

Reposited in the GSC

Collection methods: surface (in situ),

Primary reference: T.P. Poulton. 1991. Hettangian through Aalenian (Jurassic) guide fossils and biostratigraphy, Northern Yukon and adjacent Northwest Territories. Geological Survey of Canada Bulletin (410)1-95 [A. Miller/K. Layou/K. Layou]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 34229: authorized by Arnold Miller, entered by Karen Layou on 22.08.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Pectinida - Oxytomidae
? Meleagrinella sp. Whitfield 1855 scallop
 Pholadomyida - Pholadomyidae
Pholadomya sp. Sowerby 1823 clam
Gastropoda
  -
Gastropoda indet. Cuvier 1797 snail
Cephalopoda
 Ammonitida - Asteroceratidae