East Brook
Basic information
Sample name: East Brook

Sample aka: Arbuckle Mountain

Reference: A. P. Jijina, E. D. Currano, and K. Constenius. 2019. The paleobotany and paleoecology of the Eocene Herren Beds of north-central Oregon, USA. Palaios 34:424-436 [ER 4417]
Geography
Country: United States

State: Oregon

County: Morrow

Coordinate: 45.12° N, -119.05° W
Latlng basis: estimated from map

Time interval: Middle Eocene

Max Ma: 44.5

Min Ma: 43.8

Age basis: other

Geography comments: "~28 km southeast of the town of Heppner" (rough coordinate based on map in Fig. 1)
from the upper Herren Beds, which are "bracketed by the ca. 44.5 Ma age at the base and the age of the overlying Clarno Formation that provisionally has an age of about 43.8 Ma": the first age is U/Pb on zircon and the second is based on "argon-dating", indicating a Middle Eocene age

•
Environment
Lithology: sandstone

Taphonomic context: fluvial deposit

Habitat comments: from a "thinly bedded, very fine sandstone rich in organics and fossiliferous leaf layers interbedded with siltstone lenses" that represents "a channel facies"

Methods
Life forms: leaves

Sample size: 713 specimens

Years: 2014, 2015

Museum: University of Wyoming Geological Museum

Net or trap nights: 0

Basal area status: not applicable

Metadata
Sample no: 4702

Contributor no: John Alroy

Enterer: John Alroy

Modifier no: John Alroy

Created: 2025-11-23 00:45:55

Modified: 2025-11-23 00:45:55

Abundance distribution
Each square represents a species. Square sizes are proportional to counts. Values are logged.
Statistics
10 species
2 singletons
total count 713
geometric series index: 15.2
Fisher's α: 1.647
geometric series k: 0.4989
Hurlbert's PIE: 0.4166
Shannon's H: 0.8099
Good's u: 0.9972
Register
Plafkeria sp. HER21 1
Alnus sp. HER22 522
Platanus sp. HER23 5
Platanus sp. HER24 13
Quercus banksiafolia 153
Angiospermae indet. HER263
Angiospermae indet. HER272
Magnolia sp. HER 28 7
Angiospermae indet. HER296
Thuja sp. HER30 1