- of
Asteroceras obtusum zone of
Caenisites turneri zone of
Arnioceras semicostatum zone of
Arietites bucklandi "International
Chronostratigraphic Chart"...
-
Astralium semicostatum,
common name the half-ribbed star s****, is a
species of sea snail, a
marine gastropod mollusk in the
family Turbinidae, the turban...
-
Vexillum semicostatum,
common name the half-ribbed mitre, is a
species of
small sea snail,
marine gastropod mollusk in the
family Costellariidae, the ribbed...
-
quadricollis (Fairmaire, 1902)
Tribolium semele Hinton, 1948
Tribolium semicostatum (Gebien, 1910)
Tribolium sulmo Hinton, 1948
Tribolium thusa Hinton, 1948...
- (Dall, 1910)
Astraea semicostata (Kiener, 1850):
synonym of
Astralium semicostatum (Kiener, 1850)
Astraea sirius Hedley, C., 1923:
synonym of Astralium...
- desertorum, A. elmeri, A. intermedium, A. riparium, A. scabriglume, A.
semicostatum, A. subsecundum, A. trachycaulum, A.
trachycaulum var. trachycaulum,...
- Lias
Formation Stratigraphic range: Rhaetian-Lower
Sinemurian Planorbis-
Semicostatum ~201–198 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Lower Lias
sequence exposed...
-
Apoderoceras A. cf. dunrobinense, A.
subtriangulare Arnioceras A.
semicostatum Semicostatum Zone
Asteroceras A.
obtusum Obtusum zone
Caenisites Cymbites Echioceras...
-
Arnioceras rejectum Fucini 1902
Arnioceras robustum Quenstedt 1884
Arnioceras semicostatum Young and Bird 1828
Arnioceras speciosum Fucini 1902
Synonyms Arniotites...
-
stage in the
Lower Jur****ic. It is a sub zone
ammonite of the
Arnioceras semicostatum Zone.
Coroniceras has a thin
discoidal form with a
circular whorl section...
