Also known as Bridge Creek Flora
Where: Wheeler County, Oregon (44.6° N, 120.3° W: paleocoordinates 44.3° N, 109.5° W)
• coordinate stated in text
• small collection-level geographic resolution
When: John Day Formation, Early/Lower Oligocene (33.9 - 28.4 Ma)
• formation-level stratigraphic resolution
Environment/lithology: lacustrine; tuff
Size class: mesofossils
Preservation: mold/impression, original carbon
Collection methods: bulk,
• "assemblage is dominated by Alnus, Betula, Quercus, and Metasequoia....apparent absence of Asterocarpinus fruits and Paracarpinus leaves in this assemblage contrasts with their presence in all other Bridge Creek assemblages examined in this study."
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 35220: authorized by Bruce Tiffney, entered by Julia Fosdick on 18.11.2003
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Angiospermae | |
Cercidiphyllum crenatum Brown 1935 katsura | |
Liquidambar sp. Linnaeus 1753 sweetgum | |
Hydrangea sp. Linnaeus 1753 hydrangea | |
Mahonia simplex barberry | |
cf. Menispermum sp. Linnaeus 1753 moonseed | |
Florissantia speirii Manchester 1992 nightshade | |
Cercis maurerae, "Leguminosae gen. et sp. indet." = Fabaceae, Cladrastis oregonensis, Micropodium ovatum
Cercis maurerae redbud
"Leguminosae gen. et sp. indet." = Fabaceae Lindley 1836 legume
Cladrastis oregonensis yellowwood
Micropodium ovatum legume | |
Quercus sp. Linnaeus 1753 oak
Quercus consimilis Newberry 1883 oak
Quercus berryi Trelease 1918 oak
Fagus pacifica beech | |
Crataegus merriamii hawthorn | |
Ulmus sp. 1 Linnaeus 1753 elm
Ulmus speciosa Newberry 1883 elm | |
Rosa sp. Linnaeus 1753 rose
Rosa hilliae Lesquereux 1883 rose | |
Acer osmontii maple
Acer sp. A Linnaeus 1753 maple
Acer sp. C Linnaeus 1753 maple
Acer cranei Wolfe and Tanai 1987 maple
Dipteronia sp. Oliver 1889 soapberry | |
Rhus lesquereuxii Knowlton and Cockerell 1919 sumac | |
Tilia aspera linden | |
Cunninghamia chaneyi cypress
Metasequoia sp. Miki 1941 dawn redwood | |
Polypodiopsida | |
Equisetum sp. Linnaeus 1753 horsetail | |
Craigia | |
Juglandiphyllites | |
Plafkeria | |