Dating sites in eugene oregon
This study also presents new Ar plateau age data for Cenozoic deposits in southern Oregon.Lower to Middle Eocene deposits yielded 305 specimens of petrified wood from sandstones and conglomerates of the basal part of the Payne Cliffs Formation with only 6% of dicotyledons exhibiting distinct growth rings and none having ring porous or semi-ring porous wood.Middle Oligocene deposits yielded 218 petrified wood specimens from volcaniclastic sediments of the middle part of the Western Cascades Group with 97% of the dicotyledons exhibiting distinct growth rings.An Upper Oligocene exposure yielded 254 specimens from volcaniclastic sediments of the upper part of the Western Cascades Group with all dicotyledons exhibiting distinct growth rings and 59% having ring porous or semi-ring porous wood.The latest ages coincide with changing regional climate corresponding to the onset of the Younger Dryas.
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Middle Eocene exposures just stratigraphically above the first locality produced 278 specimens from the lower to the middle part of the Payne Cliffs Formation, with 66% of the dicotyledons exhibiting distinct growth rings.
Two specimens of were also collected from sediments at this locality.
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The city is known for its gardens – be sure to visit the International Rose Test Garden, the Portland Japanese Garden, and the Portland Art Museum and Sculpture Garden, or go hiking, biking, or strolling in Washington Park.