Lincoln (UGSG 16018) - #84 (Moore, 1963) (Miocene of the United States)

Also known as Locality #84 (Moore, 1963); USGS 16018

Where: Lincoln County, Oregon (44.7° N, 124.1° W: paleocoordinates 44.5° N, 119.4° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Astoria Formation, Middle Miocene (16.0 - 11.6 Ma)

• Unknown member. Astoria Formation has been used as a name for almost all of the marine middle Miocene sedimentary rocks of Washington and Oregon although these correlations are poorly constrained. The formation has been divided into three members: a lower sandstone, a shale, and an upper sandstone. These rocks form the northern limb of a syncline, the asis of which is exposed east of Astoria, and the syncline trends NE and plunges to the SW. The Astoria Formation is intermittently exposed; theya re faulted and exposures are interupted by volcanic rocks and slides. The maximum thickness of any exposure is 25 feet.

• bed-level stratigraphic resolution

Environment/lithology: coastal; poorly lithified, silty, calcareous shale and fine-grained, silty sandstone

• Astoria Formtaion is faulted and interupted in exposure by volcanic rocks and land slides.
• Strata exposed consist shale varying in silt and sand content, siltstone, fine-grained sandstone with varying amounts of silt, coarse-grained sandstone, conglomerate, and tuff. Calcareous silty shale and fine-grained silty sandstone generally predominate.

Size class: macrofossils

Preservation: concretion, replaced with other

Reposited in the CAS, USNM

Collection methods: salvage, quarrying, surface (float),

• Collected by H.E. Vokes, 1946. Collections reside in the Californian Academy of Sciences, the U.S. National Museum, and presumably the USGS.

Primary reference: E. J. Moore. 1963. Miocene marine mollusks from the Astoria Formation in Oregon. United States Geological Survey Professional Paper 419 [A. Miller/A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 39605: authorized by Austin Hendy, entered by Austin Hendy on 31.05.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for mollusca
Bivalvia
 Arcida - Arcidae
Anadara (Anadara) devincta ark
split-rib form
 Pectinida - Pectinoidae
 Cardiida - Veneridae
 Nuculida - Nuculidae
Acila (Truncacila) conradi Meek 1864 divaricate nutclam
 Protobranchia - Nuculanidae
Saccella amelga pointed nut clam
Gastropoda
 Neogastropoda - Cancellariidae
 Neogastropoda - Muricidae
 Neogastropoda - Turridae
"Megasurcula cf. condonana" = Surculites (Megasurcula)
"Megasurcula cf. condonana" = Surculites (Megasurcula) turrid
 Neogastropoda - Pseudomelatomidae
 Ficoidea - Ficidae
Ficus modesta fig shell
 Naticoidea - Naticidae
 Calyptraeoidea - Calyptraeidae
Crepidula praerupta Conrad 1849 slipper shell
 Sorbeoconcha - Turritellidae
Turritella oregonensis Conrad 1849 turret shell