Related Research Articles
Megalneusaurus is an extinct genus of large pliosaur that lived in the Sundance Sea during the Kimmeridgian, ~156-152 million years ago, in the Late Jurassic. It was named by paleontologist W. C. Knight in 1895.
Arthropterygius is a widespread genus of ophthalmosaurid ichthyosaur which existed in Canada, Norway, Russia, and Argentina from the late Jurassic period and possibly to the earliest Cretaceous.
Cryopterygius is an extinct genus of ophthalmosaurid ichthyosaur known from the uppermost Jurassic of Central Spitsbergen, Norway. The type species, Cryopterygius kristiansenae , is known from a single, but largely complete specimen from the Slottsmøya Member of the Agardhfjellet Formation. With a total length of 5–5.5 metres (16–18 ft), it is a large ichthyosaur. A second species, C. kielanae, was found in the Kcynia Formation from the Late Jurassic of Poland. It is smaller than the type species, with a length of 3.5–4 metres (11–13 ft).
Palvennia is an extinct genus of ophthalmosaurid ichthyosaurian known from the uppermost Jurassic of Central Spitsbergen, Norway. It was named for PalVenn, the Friends of the Palaeontological Museum in Oslo, whose expedition led to the discovery of the type specimen. Palvennia was a medium-sized ichthyosaur, measuring 3–4 m (9.8–13.1 ft) long and weighing 300 kg (660 lb). It is known from a single skull from the Slottsmøya Member of the Agardhfjellet Formation that measures 86 cm long. It is unusual in having a very short rostrum, similar to Ichthyosaurus breviceps. Because of this, the orbit seems very large, but this may be effected by crushing. The single and only known species is Palvennia hoybergeti Druckenmiller et al., 2012. In 2019, Palvennia was synonymized with Arthropterygius, though maintained as a separate species, by Nikolay Zverkov and Natalya Prilepskaya, although this synonymy was objected to later that same year by Lene Delsett and colleagues, who maintained that they were sufficiently different to warrant separate genera.
The Bowser Formation is a geologic formation in Alaska. It preserves fossils dating back to the Jurassic period.
The Chinitna Formation is a geologic formation in Alaska. It preserves fossils dating back to the Jurassic period.
The Cynthia Falls Sandstone is a geologic formation in Alaska. It preserves fossils dating back to the Jurassic period.
The Fitz Creek Siltstone is a geologic formation in Alaska. It preserves fossils dating back to the Jurassic period.
The Kialagvik Formation is a geologic formation in Alaska. It preserves fossils dating back to the Jurassic period.
The Kingak Shale is a geologic formation in Alaska. It preserves fossils dating back to the Jurassic period.
The Shelikof Formation is a geologic formation in Alaska. It preserves fossils dating back to the Jurassic period.
The Tiglukpuk Formation is a geologic formation in Alaska. It preserves fossils dating back to the Jurassic period.
The Gaikema Formation is a geologic formation in Alaska. It preserves fossils dating back to the Jurassic period.
The Red Glacier Formation is a geologic formation in Alaska. It preserves fossils dating back to the Jurassic period.
The Kamishak Formation is a geologic formation in Alaska. It preserves fossils dating back to the Jurassic period.
The Tuxedni Group is a geologic group in Alaska. It preserves fossils dating back to the Jurassic period.
The La Caja Formation is a geologic formation in Mexico. It preserves fossils dating from the Kimmeridgian to the lower Berriasian. La Caja Formation is widespread in northeastern and central Mexico and known for their abundant and diverse well-preserved ammonites. It was deposited in hemipelagic conditions, and predominantly consists of siliclastic sediments, including marl, with limestone. It is laterally equivalent to the La Casita Formation, which represent more proximal facies. The ichthyosaurs Ophthalmosaurus icenicus and Parrassaurus yacahuitztli, metriorhynchid Cricosaurus saltillensis and the giant pliosaur "Monster of Aramberri" are known from the formation.
The La Casita Formation is a geologic formation in Mexico. It preserves fossils dating back to the Kimmeridgian to lowermost Berriasian. It is laterally equivalent to the La Caja Formation and the Pimienta Formation. The ichthyosaurs Jabalisaurus and Acuetzpalin are known from the formation, as well as the metriorhynchid Dakosaurus and indeterminate pliosaurs.
Janusaurus is an extinct genus of ophthalmosaurid ichthyosaur from the Upper Jurassic Slottsmøya Member, Agardhfjellet Formation of Central Spitsbergen. The holotype consists of a partial skull and postcrania, and would have belonged to an individual measuring 3–4 m (9.8–13.1 ft) long and weighing 135 kg (298 lb). In 2019, Janusaurus was synonymized with Arthropterygius, though maintained as a separate species, by Nikolay Zverkov and Natalya Prilepskaya, although this synonymy was objected to later that same year by Lene Delsett and colleagues, who maintained that they were sufficiently different to warrant separate genera.
Gengasaurus is an extinct genus of ophthalmosaurid ichthyosaur from the Jurassic. The type and only species, Gengasaurus nicosiai, was named in 2017, after the locality of Genga, Marche. It lived in Italy about 152 million years ago.
References
- ↑ Druckenmiller, Patrick S.; Maxwell, Erin E. (January 2014). "A Middle Jurassic (Bajocian) ophthalmosaurid (Reptilia, Ichthyosauria) from the Tuxedni Formation, Alaska and the early diversification of the clade". Geological Magazine. 151 (1): 41–48. doi:10.1017/S0016756813000125. ISSN 0016-7568.
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database" . Retrieved 8 July 2014.
 | This article about a specific stratigraphic formation in Alaska is a stub. You can help Wikipedia by expanding it. |