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Jurassic Ammonites
of Britain ....1
Grammoceras thouarense
Upper Lias
Hildoceras lisitanicum
Upper Lias
Vertabriceras sp.
Lower Kimmeridgean
Which way is up? This modern cephalopod, the Nautilus, is keen to illustrate that ammonites have been portrayed in 'upside-down' position since their early portrayals in the 16th century.
Almatheus margaritatus
M
iddle Lias
Cardioceras sp.
Upper Oxford Clay
Quenstedtoceras lamberti
Upper Oxford Clay
Eoderoceras bispinigerum
Black Ven Marls
(showing internal chambers)
Promicroceras planicosta
Lower Lias
(silicified specimen in matrix)
Who is who? Ammonites are identified by their suture pattern. Sutures mark internal chamber divisions or where the actual animal once lived.
Pictonia baylei
Lower kimmeridge Clay
Prorasenia sp.
L
ower kimmeridge Clay
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