Leo Site, Malta (Cretaceous to of the United States)

Also known as Leonardo

Where: Phillips County, Montana (48.6° N, 107.9° W: paleocoordinates 55.2° N, 73.4° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: McClelland Ferry Member (Judith River Formation), Middle Campanian to Middle Campanian (83.5 - 70.6 Ma)

• middle of formation, in fluvial section of formation

• bed-level stratigraphic resolution

Environment/lithology: channel lag; poorly lithified, lenticular, fine-grained, concretionary, yellow, calcareous sandstone and claystone

• "preserved in a point bar sequence, with the clasts representing channel lag and the discontinuities as fluctuating water volume"
• "within a partially exposed sandstone lens...there are poorly defined crossbeds and discontinuities...The sandstone...consists primarily of well-sorted, subrounded, and poorly cemented fine sand...The specimen is encased in large carbonate concretions."

Size classes: macrofossils, microfossils

Preservation: mold/impression, concretion, soft parts

Collected by Stephenson in 2000

Collection methods: quarrying, surface (in situ), mechanical,

Primary reference: N. L. Murphy, D. Trexler, and M. Thompson. 2002. Exceptional soft-tissue preservation in a mummified ornithopod dinosaur from the Campanian Judith River Formation. Journal of Vertebrate Paleontology 22(3 (suppl.)):91A [M. Carrano/M. Carrano]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 73891: authorized by Matthew Carrano, entered by Matthew Carrano on 11.07.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Equisetopsida
 Anthocerotidae - Anthocerotidae
Foraminisporis undulates
"undulatus" in ref
 Anthophyta -
Penetetrapites
  -
Penetetrapites inconspicuous
"inconspicuus" in ref
Polycingulatisporites
  -
Polycingulatisporites reduncus Playford and Dettmann 1965
Pteridopsida
  -
Echinatisporis sp. Krutzsch 1959
Deltoidospora diaphana Wilson and Webster 1946
Cyathidites minor Couper 1953
Polypodiopsida
  - Polypodiaceae
  - Osmundaceae
Baculatisporites sp. Thomson and Pflug 1953
  -
Biretisporites deltoideus
"deltoidus" in ref
Cycadopites
  -
Angiospermae
 Buxales - Buxaceae
 Asterales - Asteraceae
 Mesangiosperms - Liliaceae
Liliacidites sp. Couper 1953
  -
 Coniferales -
Pinopsida
 Pinales - Pinaceae
Magnoliopsida
  -
Hepaticae
  -
Zlivisporis cenomanianus liverwort
"cenomanicus" in ref
Schizosporis
  -
Schizosporis laevigatus Venkatachala 1968
Reptilia
 Ornithischia - Hadrosauridae
Brachylophosaurus canadensis Sternberg 1953 hadrosaurine
JRF-115-H/PCM115-H, "Leonardo"