Astoria Formation

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Astoria Formation
Stratigraphic range: Miocene
TypeGeological formation
Sub-unitsFrom top to bottom:[1]
  • Big Creek sandstone member
  • Newport sandstone member
  • Silver Point mudstone member
  • Angora Peak sandstone member
UnderliesMontesano Formation[2]
OverliesLincoln Creek Formation[2]
Location
RegionWashington, Oregon
CountryUnited States

The Astoria Formation (formerly known as the Astoria shales) is a geologic formation in Washington state & Oregon. It preserves fossils dating back to the early to middle Miocene (but was formerly thought to date to the Oligocene).[1]

Description

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The Astoria Formation is a thick marine formation representing a near shore, relatively shallow-water shelf deposit.[2] The formation spans a considerable amount of time, with its base considered to be lower boundary of Newportian Stage (late Early Miocene) & its top to be upper boundary of Newportian Stage (middle Middle Miocene).[1]

Fossil content

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Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Mammals

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Carnivorans

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Genus Species Stratigraphy Material Notes Images
Desmatophoca D. brachycephala East of Knappton, Washington.[3] Skull elements.[3] A desmatophocid.
D. oregonensis Iron Mountain Bed & an unspecified horizon.[3][4] Multiple specimens.[3][4] A desmatophocid.
File:Desmatophoca oregonensis 2.jpg
Enaliarctos E. emlongi South of Big Creek, Lincoln County, Oregon.[5] USNM 250345.[5] A pinnipedimorph, may instead be from the Nye Mudstone.[citation needed]
File:Enaliarctos emlongi Enaliarctos cropped.png
E. sp. Iron Mountain bed, Lincoln County, Oregon.[6] Partial skeleton (UWBM 89114).[6] A pinnipedimorph.
File:Enaliarctos mealsi NT.jpg
Eodesmus E. condoni Iron Mountain Bed, Oregon.[7] A nearly complete cranium.[7] A desmatophocid.
Pacificotaria P. hadromma Iron Mountain bed, Lincoln County, Oregon.[8] Complete cranium (LACM 127973).[8] A pinnipedimorph.
Proneotherium P. repenningi Lincoln County, Oregon.[9] Remains of multiple individuals.[9] An odobenid.
Pteronarctos P. goedertae Lincoln County, Oregon.[10] Skulls.[10] A pinnipedimorph.

Cetaceans

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Genus Species Presence Material Notes Images
Cophocetus C. oregonensis North of Yaquina Bay.[4] Associated skull, jaws & skeletal elements.[4] A baleen whale.
Dilophodelphis D. fordycei Nye Beach, Oregon.[11] USNM 214911.[11] A platanistid.
File:Dilophodelphis fordycei skull.stl
Wimahl W. chinookensis Washington State[12] A kentriodontid.
Zarhinocetus Z. donnamatsonae Near Elma, Washington.[2] UCMP 86139.[2] An allodelphinid.

Perissodactyls

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Genus Species Presence Material Notes Images
Aphelops A. sp. Fragment of skull (USNM 187123).[4] A rhinoceros.
File:Aphelops sp. (fossil rhinoceros) (Ash Hollow Formation, Middle Miocene; Hottell Ranch, near Harrisburg, Nebraska, USA) 5 (32695130172).jpg
Tylocephalonyx T. sp. Iron Mountain Bed, Lincoln County, Oregon.[13] A skull (NMNH 187129).[13] A chalicothere.

Birds

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Genus Species Presence Material Notes Images
Diomedeidae Gen. et. sp. indet. East of Knappton, Washington.[14] Partial skeleton (SMF Av 644).[14] An albatross.

Cartilaginous fish

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Genus Species Presence Material Notes Images
Carcharodon C. megalodon North of Newport, Oregon.[15] Species reassigned to the genus Otodus.
File:Carcharocles megalodon (Agassiz, 1837).jpg
Cetorhinus C. piersoni North of Newport, Oregon.[16] Teeth.[16] A basking shark.
Cosmopolitodus C. hastalis Coos Bay, Oregon.[15] A tooth.[15] A lamnid shark.
File:Isurus hastalis teeth.jpg
C. planus? North of Newport, Oregon.[15] A lamnid shark.
File:Isurus planus teeth.png
Galeocerdo G. cf. aduncus North of Newport, Oregon.[15] A requiem shark.
File:Fósiles de dientes de tiburón tigre (Galeocerdo aduncus), Zuber, Florida, Estados Unidos, 2021-01-19, DD 105-144 FS.jpg
Hexanchus North of Newport, Oregon.[15] A cow shark.
File:Six-gill shark.jpg
Isurus I. hastalis Coos Bay, Oregon.[15] A tooth.[15] Species reassigned to Cosmopolitodus.
I. planus? North of Newport, Oregon.[15] Species reassigned to Cosmopolitodus.
Myliobatis North of Newport, Oregon.[15] An eagle ray.
File:Myliobatis californica monterey bay aquarium.jpg
Otodus O. megalodon North of Newport, Oregon.[15] Originally reported as Carcharodon megalodon.
File:Megalodon restoration.png

See also

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References

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