UO 80, Eugene: Priabonian, Oregon

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Nuculanida - Nuculanidae
Nuculana washingtonensis (Weaver 1916)
Hickman 1969
recombined as Nuculana (Saccella) washingtonensis
Bivalvia - Solenida - Solenidae
Solena (Eosolen) eugenensis (Clark 1925)
Hickman 1969
Bivalvia - Thraciida - Thraciidae
Thracia condoni Dall 1909
Hickman 1969
recombined as Thracia (Cetothrax) condoni
Bivalvia - Cardiida - Mactridae
Spisula eugenensis (Clark 1925)
Hickman 1969
recombined as Mactromeris eugenensis
Bivalvia - Cardiida - Veneridae
Pitar (Pitar) sp. n. sp. Römer 1857
Hickman 1969
Pitar (Pitar) dalli (Weaver 1916)
Hickman 1969
Macrocallista sp. n. sp. Meek 1876
Hickman 1969
Bivalvia - Cardiida - Tellinidae
Tellina aduncanasa
Hickman 1969
Tellina (Moerella) lincolnensis (Weaver 1916)
Hickman 1969
Tellina pittsburgensis Clark 1925
Hickman 1969
Bivalvia - Cardiida - Cardiidae
Parvicardium eugenense (Clark 1925)
Hickman 1969
Bivalvia - Pholadida - Myidae
Mya (? Arenomya) kusiroensis (Nagao and Inoue 1941)
Hickman 1969
Bivalvia - Pholadida - Pholadidae
Martesia sp. Sowerby 1824
Hickman 1969
Bivalvia - Lucinida - Lucinidae
Lucinoma acutilineata (Conrad 1849)
Hickman 1969
Bivalvia - Arcida - Arcidae
Anadara (Anadara) sp. Gray 1847
Hickman 1969
Bivalvia - Mytilida - Crenellidae
Crenella ? sp. Brown 1827
Hickman 1969
Gastropoda - Opisthobranchia - Retusidae
Cylichnina turneri Effinger 1938
Hickman 1969
Gastropoda - Neogastropoda - Turridae
Gemmula bentsonae Durham 1944
Hickman 1969
Gastropoda - Neogastropoda - Ptychatractidae
Exilia lincolnensis Weaver 1916
Hickman 1969
Gastropoda - Neogastropoda - Olividae
Molopophorus fishii (Gabb 1866)
Hickman 1969
recombined as Ancilla fishii
Gastropoda - Neogastropoda - Siphonaliidae
Bruclarkia vokesi
Hickman 1969
Gastropoda - Bursidae
Olequahia schencki Durham 1944
Hickman 1969
Gastropoda - Naticidae
Sinum obliquum (Gabb 1864)
Hickman 1969
original and current combination Naticina obliqua
Neverita thomsonae Hickman 1969
Hickman 1969
synonym of Glossaulax reclusiana
Polinices washingtonensis (Weaver 1916)
Hickman 1969
Gastropoda - Epitoniidae
Acrilla (Ferminoscala) ? becki Durham 1937
Hickman 1969
Acrilla (Ferminoscala) dickersoni (Durham 1937)
Hickman 1969
Epitonium (Boreoscala) condoni (Dall 1909)
Hickman 1969
Subspecies: Epitonium (Boreoscala) condoni condoni
Gastropoda - Neotaenioglossa - Calyptraeidae
Calyptraea diegoana (Conrad 1855)
Hickman 1969
Cephalopoda - Nautilida - Aturiidae
Aturia angustata (Conrad 1849)
original and current combination Nautilus angustatus
(1 measurement)
Scaphopoda - Dentaliida - Dentaliidae
Dentalium (? Fissidentalium) laneensis Hickman 1969
Hickman 1969
see common names

Geography
Country:United States State/province:Oregon County:Lane
Coordinates: 44.0° North, 123.0° West (view map)
Paleocoordinates:44.4° North, 110.8° West
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period:Paleogene Epoch:Eocene
Stage:Priabonian 10 m.y. bin:Cenozoic 3
Key time interval:Priabonian
Age range of interval:37.71000 - 33.90000 m.y. ago
Stratigraphy
Formation:Eugene
Stratigraphic resolution:bed
Stratigraphy comments: Eugene Formation can be subdivided faunally: a lower unit correlating to the Keasey Fm, a middle unit correlating to the Gries Ranch Beds of WA, and a upper unit correlated with the Pittsburg Bluff Fm. Thickness of formation may be up to 15,000 feet, but probably around 5,000 feet. Most of the outcrops are scattered so it is difficult to estimate their relative stratigraphic placement
Lithology and environment
Primary lithology:tuffaceous,brown,gray,blue lithified sandstone
Secondary lithology:tuffaceous,brown,gray,blue siltstone
Includes fossils?Y
Includes fossils?Y
Lithology description: Tuffaceous and highly feldspathic sandstone or siltstone which is bluish-gray to olive when fresh and weathers to a buff or orange-brown color. Gray sandstone and siltstone beds may range from several to 50 feet in thickness and are interbedded with minor amounts of sandy sahel and clay shale, occasional beds of conglomerate, and thin lenses of gray or buff-colored volcanic ash
Environment:transition zone/lower shoreface
Geology comments: Retallack et al. (2000): Near-shore, shallow-marine environments are indicated by sedimentary structures such as hummocky cross-bedding, shallow water trace fossils such as Planolites and Thalassinoides and common glauconite and phosphate nodules (Mears, 1989).
Hickman (1969): Several lines of evidence suggest that most of the Eugene Formation was deposited in shallow water, at depths no greater than 30 fathoms. The coarse, tuffaceous, and arkosic character of many beds and the interfingering of the Eugene Formation with non-marine tuffaceous rocks to the east and south indicates the proximity of the Oligocene shoreline. Although mollusks are generally not good indicators of depth, genera such as Panopea, Modiolus, Solen, and Spisula are presently restricted to depths of less than 40 fathoms. The high diversity of the benthonic fauna is an indication that the environment was not one of a bay or otherwise highly restricted environment. The absence of planktonic forms is typical of turbid, near-short environments. In the same units with these relatively undisturbed infauna! assemblages there are occasional thin layers of concentrated shell material which show definite signs of reworking and current sorting. The layers range from 1 to 10 cm in thickness and cannot be traced over great distances. The shells in these layers are small and include an admixture of infaunal and epifaunal species. The shells show little sign of wear or breakage, but many of the pelecypod valves are disarticulated, indicating some degree of transport. The scaphopods in these layers show parallel alignment by the current. There is also evidence that currents were intermittent and fluctuating in strength: the assemblages contain varying percentages of large shells mixed in with the smaller ones, and in some places there are higher proportions of broken and abraded shell debris mixed in.
Taphonomy
Modes of preservation:body,mold/impression,trace
Size of fossils:macrofossils
Collection methods and comments
Collection excludes:some macrofossils
Collection methods:selective quarrying,field collection,survey of museum collection
Reason for describing collection:taxonomic analysis
Museum repositories:CAS
Collection method comments: Collections held at University of Oregon, University of California, Californian Academy of Sciences (CAS), United States Geological Survey (USGS), and Stanford University (NP).
Taxonomic list comments:Exhaustive for mollusca
Metadata
Database number:39002
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:M. Clapham Research group:marine invertebrate
Created:2004-05-18 13:32:03 Last modified:2019-08-08 21:16:53
Access level:the public Released:2004-05-18 13:32:03
Creative Commons license:CC BY
Reference information

Primary reference:
54367. H. G. Schenck. 1931. Cephalopods of the genus Aturia from western North America. University of California Publications, Bulletin of the Department of Geological Sciences 19:435-490 [M. Clapham/K. Okamoto/M. Clapham]

Secondary references:

10532 C. J. S. Hickman. 1969. The Oligocene marine molluscan fauna of the Eugene Formation in Oregon. University of Oregon Museum of Natural History Bulletin 16:1-112 [A. Miller/A. Hendy/P. Wagner]