| Heceta Limestone | |
|---|---|
| Stratigraphic range: Silurian | |
| Type | Formation |
| Location | |
| Region | Alaska |
| Country | United States |
The Heceta Limestone is a geologic formation in Alaska. It preserves fossils dating back to the Silurian period. [1]
The Aymestry Limestone is a fossiliferous limestone of Gorstian age deposited in a warm shallow sea near the eastern margin of the Iapetus Ocean. It occurs in England in the Ludlow Group, between the Upper and Lower Ludlow Shales. It derives its name from Aymestrey (sic), Herefordshire, where it may be seen on both sides of the River Lugg. It is well developed in the neighbourhood of Ludlow and occupies a similar position in the Ludlow shales at Woolhope, the Abberley Hills, May Hill and the Malvern Hills.
Syringopora is an extinct genus of phaceloid tabulate coral. It has been found in rocks ranging in age from the Ordovician to the Permian, although it was most widespread during the Silurian, Devonian, and Carboniferous periods. Among other places, it has been found in the Columbus Limestone in Ohio, and in the Spring Branch Member of the Lecompton Limestone in Kansas.
The Williamsport Sandstone is a sandstone geologic formation in West Virginia, Virginia, Pennsylvania, and Maryland. the formation includes the Cedar Creek Limestone member. Near Cumberland, Maryland it includes the Cedar Creek Limestone member. It preserves fossils dating back to the Silurian period.
The Louisville Limestone is a geologic formation in Ohio. It preserves fossils dating back to the Silurian period.
The Laurel Formation, also known as the Laurel Limestone or the Laurel Dolomite, is a geologic formation in Indiana and Kentucky. It preserves fossils dating back to the Silurian period.
The Kimmswick Limestone is an Ordovician geologic formation in Arkansas, Illinois and Missouri. Fossils occurring in the Kimmswick include corals, bryozoans, brachiopods, conodonts, trilobites, crinoids and mollusks.
The Sugar Run Dolomite is a geologic formation in Illinois. It is a finely-bedded dolomite, preserving fossils dating back to the Silurian period. This formation is named for the Sugar Run stream in Joliet, along which it is well exposed. The dolomite is off-white/grey on freshly cut surfaces, but over time oxidizes to a distinctive cream yellow color, due to trace presence of iron. It is a member of the Niagran series.
The Decatur Limestone is a geologic formation in Tennessee. It preserves fossils dating back to the Silurian period.
The Badger Flat Limestone is a limestone geologic formation in California.
The Payton Ranch Limestone is a geologic formation in the Klamath Mountains province (geology) of Northwestern California.
The Alapah Limestone is a geologic formation in Alaska. It preserves fossils dating back to the Carboniferous period.
The Descon Formation is a geologic formation in Alaska. It preserves fossils dating back to the Silurian period.
The Kashevarof Formation is a geologic formation in Alaska. It preserves fossils dating back to the Silurian period.
The Kennel Creek Formation is a geologic formation in Alaska. It preserves fossils dating back to the Silurian period.
The Willoughby Limestone is a geologic formation in Alaska. It preserves fossils dating back to the Silurian period.
The Road River Formation is a geologic formation in Alaska. It preserves fossils dating back to the Silurian period.
The Cornwallis Limestone is a geologic formation in Alaska. It preserves fossils dating back to the Triassic period.
The Limestone Point Formation is a geologic formation in New Brunswick. It preserves fossils dating back to the Silurian period.
The Woolhope Limestone is a geologic formation in Wales. It preserves fossils dating back to the Silurian period.
Cladospongia is an extinct genus of sponges in the family Preperonidellidae from the Silurian period. The species C. alaskensis is from the Heceta Limestone Formation, on Prince of Wales Island, Southeastern Alaska.
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