Annals of the South African Museum: Annale Van Die Suid-Afrikaanse Museum, Volume 107, Issue 1South African Museum, 1898 - Natual history |
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Page 64
... aperture . A size- frequency histogram ( Cooper & Kennedy 1977 , fig . 3 ) shows two size groupings . Macro- and microconchs appear to have different apertures : microconchs have an oblique down - turned , collared aperture , whereas ...
... aperture . A size- frequency histogram ( Cooper & Kennedy 1977 , fig . 3 ) shows two size groupings . Macro- and microconchs appear to have different apertures : microconchs have an oblique down - turned , collared aperture , whereas ...
Page 65
... aperture at whorl heights of between 7.3 and 11.7 mm , ribs strengthen on the venter towards the aperture , a dorsal constriction develops and the aperture itself may be distinctly flared ( see e.g. Cobban & Scott 1972 , pl . 17 ( figs ...
... aperture at whorl heights of between 7.3 and 11.7 mm , ribs strengthen on the venter towards the aperture , a dorsal constriction develops and the aperture itself may be distinctly flared ( see e.g. Cobban & Scott 1972 , pl . 17 ( figs ...
Page 69
... aperture of B. obtusus ; some specimens , e.g. Birkelund ( 1965 , pl . 10 ( fig . 1a - c ) ) have less - inflated apertures ; others , as mentioned above ( p . 59 ) , retain traces of an early flared aperture on the phragmocone . In the ...
... aperture of B. obtusus ; some specimens , e.g. Birkelund ( 1965 , pl . 10 ( fig . 1a - c ) ) have less - inflated apertures ; others , as mentioned above ( p . 59 ) , retain traces of an early flared aperture on the phragmocone . In the ...
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Common terms and phrases
9 figs Albian ammonites anceps aperture aquilaensis Baculites Baculites cf Baculites codyensis Reeside Baculites sp baculitid baculoides bailyi Bearpaw Shale BMNH body chamber Boehmoceras Brunnschweiler 1966 California capensis carinatus Cenomanian Chalk Cobban & Kennedy Collignon 1970 compressus Coniacian County Creek Elias Eubaculites fide Formation gaudini genus Baculites Hokkaido Holotype Holotype by monotypy Indo-Pacific Kennedy & Cobban Klinger & Kennedy kossmati Lechites Lectotype leopoliensis lineage Lower Campanian Lower Maastrichtian Maastrichtian macroconch Madagascar Matsumoto & Obata Matsumoto 1959 Meek Middle Campanian Moberg Montana Morton muscle scar NHMW Occurrence original of Collignon ovatus paratype phragmocone Pierre Shale Pseudobaculites Reeside Santonian Sciponoceras shell South Dakota Spath species specimens Stratigraphic distribution subanceps subsequent designation suture line text-fig Toole County Trachybaculites Turonian Type Upper Albian Upper Campanian Upper Maastrichtian Upper Turonian USGS Mesozoic locality USNM vagina vanhoepeni venter ventral vertebralis Western Interior whorl height whorl section Wright & Kennedy Wyoming yokoyamai zone Zululand