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Information about Bajocian

In the geologic timescale, the Bajocian is an age of the Middle Jurassic epoch of the Jurassic period of the Mesozoic era of the Phanerozoic eon. It lasted from approximately 171.6 Ma to around 167.7 Ma (million years ago). The Bajocian age succeeds the Aalenian age and precedes the Bathonian age, all in the same epoch.

The stage takes its name from the town of Bayeux, in the region of Normandy in France.

Vertebrate Fauna

Enlarge picture
A life restoration of a Metriorhynchus species.

Thalattosuchians

Thalattosuchia is the name given to a clade of marine crocodylomorphs from the Early Jurassic to the Early Cretaceous that had a cosmopolitan distribution.
An opportunistic carnivore that fed on fish, belemnites and other marine animals and possible carrion. Metriorhynchus grew to an average adult length of 3 meters (9.6 feet), although some individuals may have reached lengths rivaling those of large nile crocodiles.

Invertebrate Fauna

Ammonitida

Members of the order ammonitda are known as Ammonitic ammonites. They are distinguished primarily by their suture lines. In ammonitic suture patterns, the lobes and saddles are much subdivided (fluted) and subdivisions are usually rounded instead of saw-toothed. Ammonoids of this type are the most important species from a biostratigraphical point of view. This suture type is characteristic of Jurassic and Cretaceous ammonoids but extends back all the way to the Permian.

Genera Originating in Aalenian Strata

  • Asthenoceras
  • Bradfordia
  • Euaptetoceras
  • Eudmetoceras
    Enlarge picture
    A fossil ammonite of the order ammonitida
  • Euhoploceras
  • Fontannesia
  • Graphoceras
  • Haplopleuroceras
  • Hyperlioceras
  • Padragosiceras
  • Praestrigites
  • Reynesella
  • Sonninia
  • Spinammatoceras
  • Trilobiticeras
  • Tugurites

Originating in Lower Bajocian Strata

The following is a list of ammonite genera whose fossils are geochronologically found first in lower Bajocian strata. These genera may survive into later portions of the Bajocian stage, or even into later geological stages. This list should not be thought of in terms of the lifespan of the genera included.
  • Apsorroceras
  • Asphinctites
  • Cadomoceras
  • Chondroceras
  • Darellia
  • Docidoceras
  • Dorsetensia
  • Duashnoceras
  • Emileia
  • Fissilobiceras
  • Frogdenites
    Enlarge picture
    Life restorations of two different ammonite genera.
  • Guhsania
  • Hebetoxyites
  • Kumatostephanus
  • Labyrinthoceras
  • Leptosphinctes
  • Lissoceras
  • Newmarracarroceras
  • Normannites
  • Oecotraustes
  • Oppelia
  • Otoites
  • Phaulostephanus
  • Poecilomorphus
  • Praebigotites
  • Protoecotrausites
  • Pseudotoites
  • Shirbuirnia
  • Skirroceras
  • Skolekostephanus
  • Sphaeroceras
  • Stemmatoceras
  • Strigoceras
  • Stegoxyites
  • Subcollina
  • Teloceras
  • Toxamblyites
  • Toxolioceras
  • Witchellia
  • Zemistephanus
  • Zurcheria

Originating in Upper Bajocian Strata

The following is a list of ammonite genera whose fossils are geochronologically found first in upper Bajocian strata. These genera may survive into later portions of the Bajocian stage, or even into later geological stages. This list should not be thought of in terms of the lifespan of the genera included.
  • Bigotites
  • Caumontisphinctes
  • Cleistosphinctes
  • Dimorphinites
  • Diplesioceras
  • Durotrigensia
  • Eocephalites
  • Ermoceras
  • Hlawiceras
  • Kosmermoceras
  • Lupherites
  • Magharina
  • Megasphaeroceras
  • Orthogarantiana
  • Parastrenoceras
  • Praeparkinsonia
  • Prorsisphinctes
  • Pseudogarantiana
  • Sohlites
  • Spiroceras
  • Strenoceras
  • Telermoceras
  • Thamboceras
  • Trimarginia
  • Vermisphinctes
  • Cranocephalites
  • Okribites
  • Parkinsonia
Synonymous with a modern plant genus.
  • Garantiana
  • Epistrenoceras
  • Procerites
  • Siemiradzkia
  • Cadomites
  • Oecoptychius
  • Oxycerites

Belemnites

Belemnites (or belemnoids) are an extinct group of marine cephalopod, very similar in many ways to the modern squid and closely related to the modern cuttlefish. Like them, the belemnites possessed an ink sac, but, unlike the squid, they possessed ten arms of roughly equal length and no tentacles.
  • Produvalia

Genera Originating in Aalenian Strata

Enlarge picture
Small Belemnite fossils
  • ''Holcobelus
  • ''Sachsibelus

Originating in Lower Bajocian Strata

The following is a list of belemnite genera whose fossils are geochronologically found first in lower Bajocian strata. These genera may survive into later portions of the Bajocian stage, or even into later geological stages. This list should not be thought of in terms of the lifespan of the genera included.
  • Hibolites

Originating in Upper Bajocian Strata

The following is a list of belemnite genera whose fossils are geochronologically found first in upper Bajocian strata. These genera may survive into later portions of the Bajocian stage, or even into later geological stages. This list should not be thought of in terms of the lifespan of the genera included.
  • Belemnitina

Nautiloids

Enlarge picture
An illustration of a variety of fossil nautiloid genera, although not necessarily ones contemporary with the Aalenian stage.
Nautiloids are a group of marine mollusks in the subclass Nautiloidea, which all possess an external shell, the best-known example being the modern nautiluses. They flourished during the early Paleozoic era and subsequently developed an extraordinary diversity of shell shapes and forms. Some 2,500 species of fossil nautiloids are known, but only a handful of species survive to the present day.
  • Ophionautilus
  • Somalinautilus
Jurassic period
Lower/Early Jurassic Middle Jurassic Upper/Late Jurassic
Hettangian | Sinemurian
Pliensbachian | Toarcian		Aalenian | Bajocian
Bathonian | Callovian		Oxfordian | Kimmeridgian
Tithonian
The geological time scale is used by geologists and other scientists to describe the timing and relationships between events that have occurred during the history of Earth.
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The geological time scale is used by geologists and other scientists to describe the timing and relationships between events that have occurred during the history of Earth.
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The Middle Jurassic, called the Dogger in the European system of classification, is the second epoch of the Jurassic Period. It lasted from 180-154 million years ago.

Paleogeograpgy

Pangaea began to separate into Laurasia and Gondwana and the Atlantic Ocean formed.
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The Jurassic Period is a major unit of the geologic timescale that extends from about 199.6 ± 0.6 Ma (million years ago) to 145.4 ± 4.0 Ma, the end of the Triassic to the beginning of the Cretaceous.
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A geologic period is a subdivision of geologic time that divides an era into smaller timeframes. The equivalent term used to demarcate rock layers and the fossil record is the system; thus the rocks of the Devonian System were laid down during the Devonian Period.
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The Mesozoic Era is one of three geologic eras of the Phanerozoic eon. The division of time into eras dates back to Giovanni Arduino, in the 18th century, although his original name for the era now called the 'Mesozoic' was 'Secondary' (making the modern era the 'Tertiary').
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A geologic era is a subdivision of geologic time that divides an Eon into smaller buckets. The Phanerozoic Eon is divided into three such timeframes: the Paleozoic, Mesozoic, and Cenozoic represent the major stages in the macroscopic fossil record.
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Phanerozoic (occasionally Phanaerozoic) Eon is the current eon in the geologic timescale, and the one during which abundant animal life has existed. It covers roughly 545 million years and goes back to the time when diverse hard-shelled animals first appeared.
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eon (sometimes spelled aeon) is a period of time arbitrarily designated by humans. Geologists refer to an eon as the largest subdivision of time on the geologic time scale.
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Annum is a Latin noun meaning year. It is the accusative singular of the second declension masculine noun annus (nominative), anni (genitive) [1] .

As a unit of time, it is defined as exactly 365.
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The Aalenian (IPA: /ɑːˈliːniən/) is a subdivision of the Middle Jurassic epoch of the geologic timescale that extends from about 175.6 Ma to about 171.6 Ma (million years ago).
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In the geologic timescale the Bathonian epoch is a stage during the Middle Jurassic, of the Mesozoic era of the Phanerozoic eon. It lasted from approximately 167.7 Ma to around 164.7 Ma (million years ago). The Bathonian age succeeds the Bajocian age and precedes the Callovian age.
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Commune of
Bayeux


Administration
Country  France
Arrondissement Bayeux
Canton Bayeux (chief town)
Intercommunality Communauté
de communes
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Normandy (in French: Normandie, and in Norman: Normaundie) is a geographical region corresponding to the former Duchy of Normandy. It is situated along the coasts of the south of the English Channel between Brittany (to the west) and Picardy (to the east) and
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Motto
Liberté, Égalité, Fraternité
"Liberty, Equality, Fraternity"
Anthem
"La Marseillaise"


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Thalattosuchia
Fraas, 1901

Thalattosuchia is the name given to a clade of marine crocodylomorphs from the Early Jurassic to the Early Cretaceous that had a cosmopolitan distribution.
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This article has been tagged since July 2007.
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Crocodylomorpha
Hay, 1930

Orders

see text

The Crocodylomorpha are an important group of archosaurs that include the crocodilians and their extinct relatives.
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The Jurassic Period is a major unit of the geologic timescale that extends from about 199.6 ± 0.6 Ma (million years ago) to 145.4 ± 4.0 Ma, the end of the Triassic to the beginning of the Cretaceous.
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The Cretaceous Period is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic Period (i.e. from 145.5 ± 4.0 million years ago (Ma)) to the beginning of the Paleocene epoch of the Tertiary Period (about 65.5 ± 0.3 Ma).
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Teleidosaurus
Deslongchamps, 1869

Species
  • T. calvadosi (type)
  • T. bathonicus
  • T. gaudryi


Teleidosaurus
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carnivore (IPA: /ˈkɑrnɪvɔər/), meaning 'meat eater' (Latin carne meaning 'flesh' and vorare
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Belemnoidea

Extinct Orders

Aulacocerida
Phragmoteuthida
Belemnitida
Diplobelida
Belemnoteuthina

Belemnites (or belemnoids) are an extinct group of marine cephalopod, very similar in many ways to the modern squid and closely related to the
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C. niloticus

Binomial name
Crocodylus niloticus
(Laurenti, 1768)

The Nile crocodile (Crocodylus niloticus
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Sutures are the stitches that doctors, and especially surgeons, use to hold skin, internal organs, blood vessels and all other tissues of the human body together, after they have been severed by injury or surgery.
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The Jurassic Period is a major unit of the geologic timescale that extends from about 199.6 ± 0.6 Ma (million years ago) to 145.4 ± 4.0 Ma, the end of the Triassic to the beginning of the Cretaceous.
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The Cretaceous Period is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic Period (i.e. from 145.5 ± 4.0 million years ago (Ma)) to the beginning of the Paleocene epoch of the Tertiary Period (about 65.5 ± 0.3 Ma).
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