ORIGINAL ARTICLE
Late Eocene woods from central Oregon, western USA
1
North Carolina State University, Box 8005, Raleigh, NC, 27695-8005, USA
2
Florida Museum of Natural History, University of Florida, Dickinson Hall, 1659 Museum Road, Gainesville,
Florida, 32611-7800, USA
3
Naturalis Biodiversity Center, P.O. Box 9517, 2300 RA Leiden, The Netherlands
These authors had equal contribution to this work
Submission date: 2024-10-30
Acceptance date: 2025-02-05
Online publication date: 2025-06-12
HIGHLIGHTS
- Twenty distinct wood types occur at the late Eocene Brummer Spring locality
- Fossil woods of Prunus are the most common
- Ring-porous woods are more common here than in the middle Eocene
- Lauraceae, Malvaceae, and Meliaceae woods suggest warm temperate to subtropical
KEYWORDS
ABSTRACT
Brummer Spring is one of several late Eocene wood localities near the town of Post, Oregon, western
USA. This locality includes four conifer wood types (one Pinus and three probable Cupressaceae) and 16
angiosperm woods, 13 of which can be assigned to family and three that cannot be reliably placed in an order.
Angiosperm families recognized include Lauraceae, Platanaceae, Cercidiphyllaceae, and Fagaceae (common at
Eocene localities in North America), as well as Salicaceae (common in compression floras, but rare in wood
assemblages), Rosaceae, which has the most specimens at this locality, Meliaceae, and Malvaceae. The affinities
of these woods are primarily with warm temperate to subtropical vegetation of eastern Asia and eastern North
America. Only Platanoxylon and Fagus occur at the two other Post localities. There also are fruits at Brummer
Spring with the only overlap between the fruits and woods being one poorly preserved “Prunus-like” endocarp.
Other fruits and seeds are Juglans, Nyssa, possible Magnolia and Taxaceae, and an Incertae Sedis. As was
true for the other two Post wood localities, the higher incidence of ring-porosity here as compared to the older
middle Eocene Clarno Nut Beds wood assemblage attests to increased seasonality from middle to late Eocene
in western North America.
FUNDING
No.
CONFLICT OF INTEREST
The authors have
declared that no competing interests exist.
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