摘要:

New material from the Ordian to early Templetonian (early Middle Cambrian) of the Georgina Basin and Daly Basin in northern Australia allows further observations on the anthaspidellid spongeRankenella morsand the chambered heteractinide spongeJawonya gurumalrespectively. Explanate specimens ofR. morsare found to bear closely spaced, rimmed oscules, and the known range of the species is extended from the Ranken Limestone near Soudan to include the Arthur Creek Formation near Ammaroo.Jawonya gurumalfrom the Tindall Limestone near Claravale is better preserved than type and topotype material, and demonstrates that the genus is two-walled, and not one-walled as originally described. Furthermore, exopore architecture is much more complex than previously envisaged. The co-occurring related genusWagimais also considered to be two-walled.Rankenellain the Ranken Limestone flourished in a low-energy, shallow subtidal marine environment subject to episodic higher-energy events that generated ooid shoals and flat-pebble conglomerates. In the Arthur Creek Formation the genus occurs in anaerobic calcimudstone deposited in a low-energy shelf area of limited circulation.JawonyaandWagimaare elements of a spongemollusc association in open shelf onkoid limestones of the Tindall Limestone.

ISSN:0311-5518    

DOI:10.1080/03115519608619188

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

Kambara implexidenssp. nov. is the second crocodylomorph from the Early Eocene (Ypresian) Tingamarra Local Fauna at Boat Mountain, near the township of Murgon, southeastern Queensland.Kambarais now the best represented genus of early Tertiary crocodylomorphs yet collected from Australia. The new species differs fromKambara murgonensisin several features, the most significant of which is possession of an interlocking dentition. Both species occur in a single stratigraphic horizon, possibly indicating two sympatric populations. The presence of adults and hatclings, coupled with the rarity of intermediately sized animals in the Murgon sample suggests the area may have been used as a nesting ground by one or both species.

ISSN:0311-5518    

DOI:10.1080/03115519608619189

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

The habitat and habit of Australia's first recorded Tertiary marsupial species,Wynyardia bassiana, found some 130 years ago at Wynyard on the northwestern coast of Tasmania, remain enigmatic (Aplin 1987, Aplin & Rich 1990). Fossil pollen and spores preserved in a rafted clast of estuarine silts from the same sequence of earliest Miocene marine sandstones as the skeletal remains indicate the local vegetation wasNothofagus-gymnosperm evergreen rainforest, probably with a cryptogam-rich rather than woody subcanopy stratum. Comparisons with present-dayNothofagusrainforests suggest that, although the subcanopy would have been sufficiently open to allow the passage of a large ground-dwelling herbivorous marsupial, limited food resources are more consistent withWynyardiabeing a generalist arboreal herbivore.

ISSN:0311-5518    

DOI:10.1080/03115519608619190

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

ISSN:0311-5518    

DOI:10.1080/03115519608619191

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor