Boulder Creek (Jurassic of the United States)

Also known as Upper Matanuska Valley

Where: Alaska (62.0° N, 148.0° W: paleocoordinates 16.1° N, 76.6° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Early/Lower Jurassic (201.4 - 174.7 Ma)

Environment/lithology: marginal marine; shale

• plants and marine shells have not been found in the same beds
• These rocks include lavas, agglomerates, breccias, and tuffs, interbedded with lesser volumes of sandstone and shale.

Collection methods: surface (float), surface (in situ),

• composite of four localities 6698, 6699, 6700, and 6701 all vaguely defined

Primary reference: F. H. Knowlton. 1916. A Lower Jurassic flora from the upper Matanuska Valley, Alaska. Proceedings of the U.S. National Museum 51(2158):451-460 [A. Rees/D. Sunderlin/D. Sunderlin]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 24779: authorized by Allister Rees, entered by Dave Sunderlin on 20.08.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Polypodiopsida
  -
Cladophlebis ? hirta Möller 1902
 Gleicheniales - Polypodiidae
Dictyophyllum nilssoni Brongniart 1836
Equisetopsida
 Pinidae - Pinidae
Pagiophyllum falcatum Bartolin 1916
 Bennettitales -
Ginkgoopsida
 Caytoniales - Caytoniaceae
? Sagenopteris sp. Presl 1838
Cycadopsida
 Cycadales - Cycadaceae
 Cycadales -
"Nilssonia polymorpha" = Nilsonia
"Nilssonia polymorpha" = Nilsonia cycads