Where: Montana (47.1° N, 110.1° W: paleocoordinates 43.1° N, 54.5° W)
• coordinate estimated from map
• local area-level geographic resolution
When: Morrison Formation, Kimmeridgian to Kimmeridgian (157.3 - 145.0 Ma)
• coal located within 15 feet of the top of the Morrison Formation
• formation-level stratigraphic resolution
Environment/lithology: fluvial-lacustrine; black, green shale and gray, sandy, carbonaceous siltstone
Size class: macrofossils
Preservation: adpression
Collection methods: quarrying, surface (float), surface (in situ), mechanical,
Primary reference: A. J. Silverman and W. L. Harris. 1967. Stratigraphy and economic geology of the Great Falls-Lewistown coal field central Montana. State of Montana Bureau of Mines and Geology Bulletin 56 1-20 [A. Rees/D. Sunderlin/D. Sunderlin]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 24670: authorized by Allister Rees, entered by Dave Sunderlin on 15.08.2002
Creative Commons license: CC BY (attribution)
Taxonomic list
| Amphibia | |
"Nilssonia sp." = Nilsonia
"Nilssonia sp." = Nilsonia Brongniart 1825 cycads | |
|
Cladophlebis cf. virginiensis Fontaine 1889 | |
|
Coniopteris cf. bella scaly tree fern | |
| Equisetopsida | |
|
Pagiophyllum sp. Heer 1881 | |
| Actinopteri | |
|
Zamites sp. Brongniart 1828 | |
|
Podozamites cf. lanceolatus Lindley and Hutton 1840 podocarp | |