Jimbo Quarry (2A) (PROXY) (Jurassic to of the United States)

Where: Converse County, Wyoming (42.6° N, 105.4° W: paleocoordinates 38.0° N, 51.2° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Morrison Formation, Kimmeridgian to Kimmeridgian (157.3 - 145.0 Ma)

• located in local "Zone 2", in middle of formation, near top of "Unit A" in this zone

• bed-level stratigraphic resolution

Environment/lithology: wet floodplain; paleosol/pedogenic, intraclastic, brown, gray, argillaceous, carbonaceous siltstone

• layer was scoured into underlying waterlogged paleosol; interpreted as a debris flow but not a splay
• Unit A has "clay gall rip-up clasts from the underlying hydromorphic paleosol...The top of Unit A displays well-defined brown mottles in a brownish-gray to gray muddy-siltstone, demonstrating some degree of seasonality and pedogenesis after emplacement...The matrix of Unit A consists of clay to silt sized particles, showing no signs of sorting or structure. Clast size (including bone) ranges from coarse sand to 1 m bone boulders. All clasts are completely supported by a muddy-silt matrix...[there is] an absence of stratification or grading." Layer is grayosh brown (5YR 4/2).

Size classes: macrofossils, mesofossils

Preservation: coalified

Collected by W. Wahl in 1995-2002

Collection methods: mechanical,

Primary reference: D. Lovelace. 2004. Taphonomy and paleoenvironment of a Late Jurassic dinosaur locality in the Morrison Formation of east-central Wyoming. Journal of Vertebrate Paleontology 24(3, suppl.):85A [M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 74664: authorized by Matthew Carrano, entered by Matthew Carrano on 23.08.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

 Saurischia - Diplodocidae
Supersaurus vivianae2 Jensen 1985 diplodocine
disarticulated skeleton
 Saurischia -
Theropoda indet. Marsh 1881 theropod
"a semi-articulated small theropod"
Plantae indet.1 Haeckel 1866
 Pinales -
cf. Brachyphyllum sp.1 Brongniart 1828