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Schrader Bluff Formation

The Schrader Bluff Formation is a geologic formation in Alaska. It preserves fossils dating back to the Cretaceous period, Fossils include Inoceramus and Scaphites. Originally named by George Gryc and others on the formation of marine Colville gr ...

Sohlde Formation

The Sohlde Formation is a geologic formation located in the federal states of Lower Saxony and Saxony-Anhalt in Germany. It preserves fossils from the Upper Cenomanian–lower Upper Turonian period.


Demosponges are the most diverse class in the phylum Porifera. They include 76.2% of all species of sponges with nearly 8.800 species worldwide. They are sponges with a soft body that covers a hard, often massive skeleton made of calcium carbonat ...


Holozoa is a group of organisms that includes animals and their closest single-celled relatives, but excludes fungi. Holozoa is also an old name for the tunicate genus Distaplia. Because Holozoa is a clade, comprising all organisms that are more ...

Dedham Granite

Dedham Granite is a light grayish-pink to greenish-gray, equigranular to slightly porphyritic, variably altered, granite south and west of Boston, named for the town of Dedham, Massachusetts.

Maplewell Group

The Maplewell Group is an Ediacaran lithostratigraphic group present in Leicestershire in the English Midlands. The strata are exposed in Charnwood Forest, west of Leicester. Besides a variety of volcaniclastic sandstones and mudstones, there are ...


Peroniceras is an ammonite belonging to the Ammonitida family Collignoniceratidae. The species of this genus was widely distributed throughout the world. They were fast moving predators nektonic shelled ammonoids.


Schlotheimia is a genus of extinct cephalopods belonging to the subclass Ammonoidea that lived during the Hettangian stage at the beginning of the Early Jurassic.

Toyora Group

The Toyora Group is one of the Mesozoic strata in Japan, and was originally named Toyoura Series by Hisakatsu Yabe in 1920. The present name was defined by Tatsuro Matsumoto in 1949. It is the Lower-Upper Jurassic sediments in the East Asian cont ...


Reineckeia is an extinct genus of ammonoid cephalopods belonging to the family Reineckeiidae. Nektonic these fast-moving predators that lived during the middle Jurassic period, from Batskih age to Callovian age.


Harpoceras is an extinct genus of cephalopod belonging to the family Hildoceratidae. These cephalopods existed in the Jurassic period, during Toarcian age from Falciferum zone to Commune subzone of Bifrons zone. They were fast-moving nektonic car ...


Albertoppelia is an extinct genus of prawn which existed during the Upper Jurassic period, named after Albert Oppel. It contains the single species Abertoppelia kuempeli.


Alcmonacaris winkleri is an extinct Late Jurassic species of shrimp in its own genus, Alcmonacaris, which cannot yet be placed in a family. It was described in 2009 from a specimen in the Solnhofen limestone.


Bathmochoffatia is an extinct mammal of the Upper Jurassic. It was a relatively early member of the also extinct order Multituberculata. It lived in Portugal at about the same time as the far more famous dinosaur, Allosaurus. It is in the suborde ...

Conglomerado Cualac

The Conglomerado Cualac is a geologic formation in Mexico. First described by Guzman in 1959, under the name Cuarcita Cualac. Later, Erben gave it their actual name. It consist of thick beds of a hard, white and sometimes yellowish conglomerate w ...


Eryonidae is a family of fossil decapod crustaceans which lived from the Upper Triassic to the Lower Cretaceous. It contains four genera: An aggregation of three unidentified eryonids was reported in 2012 inside a Late Jurassic ammonoid of the sp ...


Eurycormus is an extinct genus of prehistoric bony fish that lived from the Callovian stage of the Middle Jurassic epoch to the early Tithonian stage of the Late Jurassic epoch.


Fontannesia is an ammonoid cephalopod genus with a small to medium size, evolute, discoidal shell that was extant during the Jurassic Period. The sides are ribbed, the venter has a single median keel, and tubercles are lacking. Fontannesia includ ...


Fuciniceras is an extinct cephalopod genus included in the ammonoid family Hildoceratidae, that lived during the Pliensbachian stage of the Early Jurassic. The shell of Fuciniceras is generally small, evlute, and strongly ribbed.

Gaikema Formation

The Gaikema Formation is a geologic formation in Alaska. It preserves fossils dating back to the Jurassic period. Gaikema leads here. Dutch cabaret artist, writer, and lyricist, see Seth Gaaikema


Glaessneropsoidea is a superfamily of fossil crabs. They are found in rocks from Late Jurassic age to Late Cretaceous. The 45 species in the superfamily are divided among 11 genera in four families: Family Glaessneropsidae Patrulius, 1959 Ekalaki ...


Haramiya is a mammaliform that is a lineage either unrelated or a paraphyletic parent to multituberculates from the Mesozoic era. Only Haramiya teeth and the skull was found, apparently, it was built in 12 cm 5 in essence, having a resemblance to ...

Heather Formation

The Heather Formation is a geologic formation occurring in Norway and the United Kingdom. It preserves fossils from the Bathonian to Early Kimmeridgian stages of the Middle to Late Jurassic period and was deposited in a marine, anoxic palaeoenvir ...

Impressamergel Formation

The term was proposed by Gert Bloos, Gerd Dietl and Gunter Schweigert in 2005 for a lithostratigraphic rock formation. The name goes back to the term Impressakalke introduced by Friedrich August Quenstedt in 1857. The name is derived from the bra ...