摘要:

New and previously defined parameters forCycloclypeus, Heterostegina, MiogypsinaandLepidocyclinahave been treated statistically using standard univariate techniques, and multivariate methods have been used withLepidocyclina (Nephrolepidina). The univariate studies show that three parameters forCycloclypeus(pc, Spc4+5, log D1of O'Herne & van der Vlerk, 1971) are of equal biostratigraphic value; forHeterosteginatwo new ones (N0and S4+5) appear useful for correlation, but need to be tested over a wider geographic area; forMiogypsina, which is rare and has a limited stratigraphic range in the areas studied, only parameters X and V are useful for taxonomic and biostratigraphic purposes; forLepidocyclina (Eulepidina)both A (of van der Vlerk, 1959a,b) and the new parameter LA appear to be useful for correlation, but a realistic appraisal of these must await detailed studies elsewhere. ForL. (Nephrolepidina)two new parameters (E,F) and those of van der Vlerk (1959a,b — parameters A and B), and O'Herne & van der Vlerk (1971 — parameter dc) have been used; of these F is the most useful, with B being of only local usefulness within Australia, and A, dc and E being similarly useful only in New Zealand. Multivariate studies withL. (Nephrolepidina)show that parameter F is largely responsible for the groupings obtained.

ISSN:0311-5518    

DOI:10.1080/03115518008618929

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

A review of reported and new occurrences of ‘Devonian’ halysitids indicates that most are older than Devonian. Reports of Emsian halysitids from Chios are best attributed to errors in the compilation of Bassler (1950). The occurrences of halysitids in Quebec in strata considered Early Devonian provide the only plausible examples of the existence of this family in the Devonian. Thus, onlyCystihalysitesandQueporaappear to linger into the Devonian.

ISSN:0311-5518    

DOI:10.1080/03115518008618930

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

ISSN:0311-5518    

DOI:10.1080/03115518008618931

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

Two new genera of phosphatic bradoriids are described from the insoluble residues of Middle Cambrian limestones from two sites in the Georgina Basin:Flemingiagen. nov. from south of Duchess in the late TempletonianTriplagnostus gibbusZone in the Monastery Creek Phosphorite Member of the Beetle Creek Formation; andOepikalutagen. nov. from northwest of Mount Isa in the Thorntonia area in the upper (Undillan) part of the Currant Bush Limestone. The Templetonian bradoriids include five species previously described and named by Fleming (1973), the new taxaFlemingia duogen. et sp. nov. andDielymella? dubiasp. nov., and unnamed species belonging toSvealutaÖpik 1961 and possiblyAristalutaÖpik 1961. They appear to be part of the biocoenosis of the quiet inner margins of an ancient Bahama Banks type environment. Two new families are proposed within the suborder Phosphatocopina Müller 1964 — Oepikalutidae forZepaeraFleming and the new generaOepikalutaandFlemingia, and Monasteriidae forMonasteriumFleming — and the diagnosis for the Templetonian speciesZepaera reteFleming 1973 is emended. The trace of four thoracic segments in the new Undillan speciesOepikaluta dissutagen. et sp. nov. is consistent with the hypothesis of the presence of four thoracic limb pairs in the ancestral ostracode.

ISSN:0311-5518    

DOI:10.1080/03115518008618932

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

Two new camerate crinoids,Dichocrinus? australissp. nov. andDichocrinus? darlingtonensissp. nov., are described from the Early Permian of eastern Australia. Both are tentatively assigned generically because the precise morphology of their respective tegmens is not known. The species bear a close resemblance to Early Carboniferous North American representatives of the genus. They are interpreted as end members of a conservative and cosmopolitan crinoid lineage that experienced little change in the Palaeozoic.D? darlingtonensisis thought to be ancestral toD? australis.

ISSN:0311-5518    

DOI:10.1080/03115518008618933

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor

摘要:

A new genus and species of fordilloid pelecypod,Pojetaia runnegarigen. et sp. nov., is described from the lower part of the Parara Limestone, Yorke Peninsula, South Australia. Establishing the age of the sample on an international scale is difficult, as with almost all Early Cambrian formations, but evidence tends to suggest that this is the oldest pelecypod so far recorded. Clearly defined hinge teeth and sockets on both valves and on internal moulds help to confirm the pelecypod placement of fordilloids.

ISSN:0311-5518    

DOI:10.1080/03115518008618934

出版商:Taylor & Francis Group    

年代:1980

数据来源: Taylor