摘要:

A systematic revision of the Cainozoic Trigoniidae (Mollusca:Bivalvia) reveals that the family is represented by two genera:Eotrigonia(Paleocene-Late Miocene), known only from southern Australia with speciesE. paleocenicasp. nov.,E. eocenicasp. nov.,E. tubulifera(Tate),E. intersitans(Tate) andE. subundulata(Jenkins) (=semiundulataJenkins, =granosaPritchard =lutosaPritchard); andNeotrigonia(Middle Miocene-Recent) with fossil speciesN. acuticostata(McCoy) (=truaCotton),N. howitti(McCoy),N. mediponteasp. nov.,N. strangei(A. Adams),N. margaritacea(Lamarck) andN. uniophora(Gray), of which the latter three are found living.N. novaguineanaSkwarko occurs in the Neogene of New Guinea. Both genera are placed in the Trigoniinae.Eotrigoniaevolved fromTrigonias.s. in the latest Cretaceous or earliest Tertiary andNeotrigoniafromEotrigoniain the Oligocene or early Miocene. A neotype is designated forE. subundulataJenkins.Trigonia mirianaSkwarko, a possible ancestor of the Tertiary representatives, is redescribed.

ISSN:0311-5518    

DOI:10.1080/03115518608619039

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Some of the oldest (Early Devonian) fossil fish remains from Antarctica found so far are described and include spines of the acanthodianMachaeracanthussp. and plates of an actinolepid arthrodire. A summary of the finds of Devonian fish from Antarctica recovered so far is provided. Most of them are of Middle or Late Devonian age from Victoria Land. The material reported on here is thus significant in being Early Devonian in age.

ISSN:0311-5518    

DOI:10.1080/03115518608619040

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

The benthic foraminiferMassilina millettiincreases numerically with increasing depth of water in northern Spencer Gulf. In contrast,Cribrobulimina mixta, Nubecularia lucifuga, Peneroplis planatusandDiscorbis dimidiatusare more characteristic of shallow water. Vibrocore #198 recovered a section of Quaternary sediments from one of the deepest parts (c. 20 m) of northern Spencer Gulf. The distribution of benthic foraminifera in the upper 1.5 m of this core records the Holocene transgression and indicates continuous sedimentation since c. 8,000 radiocarbon years B.P. Amino acid racemisation values for samples ofMassilina millettitaken from core #198 are generally consistent with their depth in core. The D/L ratio, taken as an indicator of age, increases with depth. Anomalously high D/L values for the sample from 27–29 cm depth are attributed to slumping and reworking of Lower Holocene sediments, apparently initiated by a sudden seismic event c. 1,700 radiocarbon years B.P.

ISSN:0311-5518    

DOI:10.1080/03115518608619041

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor

摘要:

Nine species of brissid echinoids are described from Eocene to Miocene strata of Victoria, South Australia and the southern part of Western Australia. Redescribed areGillechinus cudmoreiFell 1964a;Brissopsis tateiHall 1907;Brissopsis praeluzonicaFell 1964b;Cyclaster archeri(Tenison Woods 1867);Granobrissoides australiae(Cotteau 1889);Meoma tuberculataHutton 1873 andSpatagobrissus laubei(Duncan 1877).Brissus fosteriandBrissopsis australisare described as new.Brissopsis praeluzonicais described from outside New Zealand for the first time.Micraster brevistellaLaube 1869;Hemiaster positaHutton 1873;Cyclaster morganiCotteau 1889; andCyclaster lycoperdonBittner 1892 are all placed in synonymy withCyclaster archeri. GranobrissoidesLambert 1920 is reinstated to generic status andG. australiaedescribed in detail for the first time. The late Middle MioceneEupatagus laubeiDuncan 1877 is placed inSpatagobrissus, a genus hitherto known only from the living South African speciesS. mirabilisH. L. Clark 1923.

ISSN:0311-5518    

DOI:10.1080/03115518608619042

出版商:Taylor & Francis Group    

年代:1986

数据来源: Taylor