Crooked River (Oligocene of the United States)

Where: Crook County, Oregon (44.1° N, 120.3° W: paleocoordinates 43.8° N, 109.5° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: John Day Formation, Early/Lower Oligocene (33.9 - 28.4 Ma)

• formation-level stratigraphic resolution

Environment/lithology: lacustrine

• tuffaceous shales

Size class: mesofossils

Preservation: mold/impression, original carbon

Collection methods: bulk,

• Alnus heterodonta is the most abundant species, followed by Quercus berryi.

Primary reference: H. W. Meyer and S. R. Manchester. 1997. The Oligocene Bridge Creek flora of the John Day Formation, Oregon. University of California Publications in Geological Sciences 141:1-195 [J. Alroy/J. Alroy/H. Wang]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 35237: authorized by Bruce Tiffney, entered by Julia Fosdick on 19.11.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

 Alismatales - Alismatidae
 Pinales - Taxodiaceae
cf. Metasequoia sp. Miki 1941 dawn redwood
 Polypodiales - Pteridaceae
 Rhamnales - Rosidae
Vitis sp. Linnaeus grapevine
 Urticales - Dilleniidae
Ulmus sp. 1 Linnaeus 1753 elm
Ulmus sp. A Linnaeus 1753 elm
Ulmus sp. B Linnaeus 1753 elm
 Juglandales - Hamamelidae
 Saxifragales - Hamamelidaceae
 Fabales - Leguminosae
 Malvales - Tiliaceae
 Rosales - Rosaceae
Rosa sp. Linnaeus 1753 rose
Rubus sp. Jordan 1997
 Rosales - Saxifragaceae
Hydrangea sp. Linnaeus 1753 hydrangea
 Sapindales - Aceraceae
Acer sp. 1 Linnaeus 1753 maple
Acer sp. 2 Linnaeus 1753 maple
Acer sp. A Linnaeus 1753 maple
Acer sp. B Linnaeus 1753 maple
 Sapindales - Meliaceae
 Proteales - Platanaceae
Platanus sp. Linnaeus 1753 plane tree
 Fagales - Betulaceae
Ostrya oregoniana hophornbeam
Alnus sp. Miller 1768 alder
 Fagales - Fagaceae
Quercus sp. Linnaeus 1753
Quercus berryi Trelease 1918
 Ranunculales - Berberidaceae
Florissantia speirii Manchester 1992