Iron Mountain (Oligocene of the United States)

Also known as Bridge Creek Flora

Where: Wheeler County, Oregon (44.9° N, 120.4° W: paleocoordinates 44.6° N, 109.6° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Early/Lower Oligocene (33.9 - 28.4 Ma)

• formation-level stratigraphic resolution

Environment/lithology: terrestrial

• tuffaceous shale

Size class: mesofossils

Preservation: mold/impression, original carbon

Collection methods: bulk,

• The most common taxa in the Iron Mountain assemblage are Metasequoia, Alnus, and Asterocarpinus/Paracarpinus, followed by Acer, and Cercidiphyllum. Pinus, Quercus, and Ulmus are very rare.

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 35236: authorized by Bruce Tiffney, entered by Julia Fosdick on 19.11.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

 Pinales - Pinaceae
 Pinales - Taxodiaceae
Metasequoia sp. Miki 1941 dawn redwood
 Equisetales - Equisetaceae
Equisetum sp. Linnaeus
 Zingiberales - Zingiberidae
Zingiberopsis sp. Hickey 1977
 Urticales - Dilleniidae
 Saxifragales - Cercidiphyllaceae
 Fabales - Leguminosae
 Myrtales - Lythraceae
 Malvales - Tiliaceae
 Rosales - Rosaceae
Rosa sp. Linnaeus 1753 rose
 Rosales - Saxifragaceae
Hydrangea sp. Linnaeus 1753 hydrangea
 Sapindales - Anacardiaceae
 Sapindales - Aceraceae
Acer sp. 1 Linnaeus 1753 maple
Acer sp. A Linnaeus 1753 maple
Acer sp. B Linnaeus 1753 maple
Acer sp. C Linnaeus 1753 maple
 Sapindales - Meliaceae
 Fagales - Betulaceae
Alnus sp. Miller 1768 alder
 Ranunculales - Berberidaceae
 Celastrales - Icacinaceae
Palaeophytocrene sp. Reid and Chandler 1933
Florissantia speirii Manchester 1992