Astoria Formation | |
---|---|
Stratigraphic range: Miocene | |
Type | Geological formation |
Sub-units | From top to bottom: [1]
|
Underlies | Montesano Formation [2] |
Overlies | Lincoln Creek Formation [2] |
Location | |
Region | Washington, Oregon |
Country | United 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]
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]
This article is missing information about invertebrate, microorganisum, and plant taxa.(February 2023) |
Color key
| Notes Uncertain or tentative taxa are in small text; |
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. | ![]() | |
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 ] | ![]() |
E. sp. | Iron Mountain bed, Lincoln County, Oregon. [6] | Partial skeleton (UWBM 89114). [6] | A pinnipedimorph. | ![]() | |
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. |
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. | ![]() |
Wimahl | W. chinookensis | Washington State [12] | A kentriodontid. | ||
Zarhinocetus | Z. donnamatsonae | Near Elma, Washington. [2] | UCMP 86139. [2] | An allodelphinid. | |
Genus | Species | Presence | Material | Notes | Images |
---|---|---|---|---|---|
Aphelops | A. sp. | Fragment of skull (USNM 187123). [4] | A rhinoceros. | ![]() | |
Tylocephalonyx | T. sp. | Iron Mountain Bed, Lincoln County, Oregon. [13] | A skull (NMNH 187129). [13] | A chalicothere. | |
Genus | Species | Presence | Material | Notes | Images |
---|---|---|---|---|---|
Diomedeidae | Gen. et. sp. indet. | East of Knappton, Washington. [14] | Partial skeleton (SMF Av 644). [14] | An albatross. | |
Genus | Species | Presence | Material | Notes | Images |
---|---|---|---|---|---|
Carcharodon | C. megalodon | North of Newport, Oregon. [15] | Species reassigned to the genus Otodus . | ![]() | |
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. | ![]() |
C. planus? | North of Newport, Oregon. [15] | A lamnid shark. | ![]() | ||
Galeocerdo | G. cf. aduncus | North of Newport, Oregon. [15] | A requiem shark. | ![]() | |
Hexanchus | North of Newport, Oregon. [15] | A cow shark. | ![]() | ||
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. | ![]() | ||
Otodus | O. megalodon | North of Newport, Oregon. [15] | Originally reported as Carcharodon megalodon. | ![]() | |
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