ENGLAND

DORSET COUNTY

STREET

BLUE LIAS FORMATION

LOWER LIAS GROUP

PRE-PLANORBIS BEDS

RHAETIAN STAGE

UPPERMOST LATE TRIASSIC EPOCH

LATEST TRIASSIC OR HETTANGIAN STAGE

LOWERMOST LIAS EPOCH

EARLIEST JURASSIC

STEM: TETRAPODA GOODRICH, 1930

SUPERCLASS: AMNIOTA HAECKEL, 1866

CLASS: REPTILIA LAURENTI, 1768

SUBCLASS: DIAPSIDA OSBORN, 1904

INFRACLASS: EURYAPSIDA COLBERT, 1945

SUPERORDER: SAUROPTERYGIA OWEN 1860

GRANDORDER: EOSAUROPTERYGIA emend RIEPPEL, 1994

ORDER: PLESIOSAURIA OWEN, 1840 NON BLAINVILLE, 1835

SUBORDER: PLESIOSAURIA OWEN, 1840 NON BLAINVILLE, 1835

INFRAORDER: PLESIOSAUROMORPHA NOVA

EUPLESIOSAURIA O’KEEFE, 2001

Family: PLESIOSAURIDAE Gray, 1825

*Thalassiodracon hawkinsii
= Plesiosaurus hawkinsii
= Plesiosaurus etheridgii

 

_____________________________________________________________________________________