| Gravesia Temporal range: | |
|---|---|
 | |
| Specimen of Gravesia gigas | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | † Ammonoidea |
| Order: | † Ammonitida |
| Superfamily: | † Perisphinctoidea |
| Genus: | † Gravesia |
Gravesia is an extinct genus of ammonite known from the Upper Jurassic (Kimmeridgian-Tithonian stages) of Europe. [1] [2]
The Jurassic is a geologic period and stratigraphic system that spanned from the end of the Triassic Period 201.3 million years ago (Mya) to the beginning of the Cretaceous Period, approximately 145 Mya. The Jurassic constitutes the middle period of the Mesozoic Era and is named after the Jura Mountains, where limestone strata from the period were first identified.
In the geological timescale, the Tithonian is the latest age of the Late Jurassic Epoch and the uppermost stage of the Upper Jurassic Series. It spans the time between 152.1 ± 4 Ma and 145.0 ± 4 Ma. It is preceded by the Kimmeridgian and followed by the Berriasian.
In the geological timescale, the Berriasian is an age/stage of the Early/Lower Cretaceous. It is the oldest subdivision in the entire Cretaceous. It has been taken to span the time between 145.0 ± 4.0 Ma and 139.8 ± 3.0 Ma. The Berriasian succeeds the Tithonian and precedes the Valanginian.
In the geologic timescale, the Kimmeridgian is an age in the Late Jurassic Epoch and a stage in the Upper Jurassic Series. It spans the time between 157.3 ± 1.0 Ma and 152.1 ± 0.9 Ma. The Kimmeridgian follows the Oxfordian and precedes the Tithonian.
The Baños del Flaco Formation is a Late Jurassic to Early Cretaceous (Tithonian to Berriasian geologic formation in central Chile. The formation comprises limestones and sandstones deposited in a shallow marine to fluvial environment. Fossil ornithopod tracks have been reported from the formation.
Perisphinctoidea, formerly Perisphinctaceae, is a superfamily of Middle Jurassic (Bajocian) to Lower Cretaceous (Barremian) ammonites, commonly with evolute shells with strong ribbing that typically divides about mid flank before crossing the venter.
Neolissoceras is a genus of haploceratid ammonites with a smooth, compressed, flat-sided shell with a flatly rounded venter and distinct umbilical margin, from the Upper Jurassic (Tithonian) - Lower Cretaceous (Hauterivian) of southern Europe, Madagascar, and India.
Jurellana tithonia, the only species in the genus Jurellana, is a fossil crab. It was found in limestone rocks from the Ernstbrunn Formation in Austria, which have been dated to the Tithonian. It was originally thought to be the world's oldest porcelain crab, but was later determined to actually be a true crab.
The Aspidoceratinae is a subfamily in the perisphictacean ammonite family, Aspidoceratidae found world wide in middle and upper Jurassic sediments.
Perisphinctidae is a family of Middle and Upper Jurassic discoidal ammonites in the order Ammonitida. They have a shell morphology that is mostly evolute, typically with biplicate, simple, or triplicate ribbing. Large forms have simple apertures and smooth body chambers while small forms have lappets and ribbed body chambers.
Juratyrant is a tyrannosauroid dinosaur genus from the late Jurassic period of England. The genus contains a single species, Juratyrant langhami, which was once classed as a species of Stokesosaurus.
Psiloceratidae is an extinct family of cephalopods belonging to the ammonite subclass.
Aulacostephanidae is an extinct ammonoid cephalopod family belonging to the superfamily Perisphinctoidea. These fast-moving nektonic carnivores lived during the Upper Jurassic period, from the Oxfordian to Tithonian ages.
The Guasasa Formation is a geologic formation in Cuba. It is Tithonian to Early Valanginian in age and contains fossils of ammonites.
The Artemisa Formation is a geologic formation in western Cuba. It preserves mainly ammonite fossils dating back to the Late Oxfordian to Tithonian period. The formation is divided into two members; La Zarza and Sumidero Members. Most of the formation was deposited in deeper marine conditions.
Pleurosternidae is an extinct family of freshwater turtles belonging to Paracryptodira. They are definitively known from the Late Jurassic to Early Cretacous (Albian) of Western Europe and North America.
Behemoth is an extinct ammonite cephalopod genus within the family Dorsoplanitidae, that lived during the upper Tithonian stage of Late Jurassic Europe and Greenland.
Laevapetchyus is a genus of ammonites.
The Etches Collection is an independent fossil museum located in the village of Kimmeridge, Purbeck, Dorset, England. It is based on the lifetime collection of Steve Etches, a fossil hunter for whom some of his finds have been named, from the local area on the Jurassic Coast, an SSI and World Heritage Site, especially around Kimmeridge Bay and the Kimmeridge Ledges.
Ringsteadia is a Jurassic ammonite belonging to the ammonitid.