摘要:

Twenty-eight species of fifteen genera of Middle Cambrian molluscs are described from tiny phosphatic moulds or silica replicas of the shells. The molluscs were etched from limestones at two sites: one in the earliest Middle Cambrian Coonigan Formation of the Mootwingee area, 130 km northeast of Broken Hill, New South Wales; and another in the middle Middle Cambrian Currant Bush Limestone of the Thorntonia area, 150 km northwest of Mt Isa, Queensland. These unusually diverse collections show that many different kinds of molluscs lived in the tropical Australian seas of the Middle Cambrian and provide new information on the way the molluscan classes Cephalopoda, Gastropoda, Rostro- conchia, and Pelecypoda evolved.

ISSN:0311-5518    

DOI:10.1080/03115517608619064

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

Isograptus ovatus davidensissubsp. nov. is described from theD. murchisoniShales of Abereiddy Bay, Wales. This discovery gives further support to the correlation of themurchisoniZone with the upper part of the Darriwil Stage of Victoria.

ISSN:0311-5518    

DOI:10.1080/03115517608619065

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

Nineteen species and eight genera of microfossils in the Amelia Dolomite microflora (ca1.5 × 109years old) are described and named. Of these, two genera (Ameliaphycus, Myxomorpha) and eleven species (Gunflintia oehlerae, Huroniospora ornata, Sphaerophycus reticulatum, S. tetragonalis, Myxococcoides reniformis, M. minutus, M. kingii, M. konzalovae, Palaeoanacystis plumbii, Ameliaphycus croxfordii, Myxomorpha janecekii) are new. Most of the micro-fossils are interpreted as being the remains of blue-green algae and the assemblage is compared with older and younger microfloras, as well as the Paradise Creek and Bungle Bungle Dolomite assemblages which are of similar age. In addition, mucilaginous moulds of both coccoid and filamentous micro-organisms are described, and some indirect evidence for the activity of sulphate reducing bacteria is presented.

ISSN:0311-5518    

DOI:10.1080/03115517608619066

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

A fossil mandible and incisor of the diprotodontid marsupialPalorchestes azealOwen is reported from a new locality at Pulbeena, near Smithon, in northwestern Tasmania. The fossils occurred with a piece of wood which has a14C age of 54,200-4,500+11,000B.P. Both fossils and wood were deposited contemporaneously in shallow-lake shell marls and swamp peat deposits of late Quaternary age. Pollen analysis indicates that thisP. azaelinhabited aEucalyptuswoodland.

ISSN:0311-5518    

DOI:10.1080/03115517608619067

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

Rock boring is a widespread mode of life in pelecypods, occurring in some representatives of eight superfamilies. After a brief review of rock boring mechanisms of the Mytilacea, the systematic position and taxonomy ofCorallidomus scobinanew name are discussed and evidence is presented for regarding this species as a facultative rock boring mytilacean pelecypod. This is the oldest known (Late Ordovician) occurrence of rock boring by pelecypods in the fossil record.

ISSN:0311-5518    

DOI:10.1080/03115517608619068

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

ISSN:0311-5518    

DOI:10.1080/03115517608619069

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

Three forms,Cothonion sympomatumgen. et sp. nov. with a bi-radially septate operculum, and the new specieslissaanddaseiaof the genusLipoporagen. nov., are described from the early Middle Cambrian Coonigan Formation in the Mootwingee district of western New South Wales, Australia. They may be representatives of hitherto unknown groups of organisms, but they are tentatively interpreted as coelenterates that reached a level of development comparable with the Anthozoa.Cothonionis placed in the new family Cothoniidae and questionably referred to the Rugosa.Lipoporais considered to be similar toCoelenteratellaKorde; both are grouped in the new family Lipoporidae and tentatively referred to the Tabulata.

ISSN:0311-5518    

DOI:10.1080/03115517608619070

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

Brachiopods of theMarginirugus barringtonensisandLevispustula levisZones comprise the youngest of three major Carboniferous biostratigraphic units in eastern Australia. The remarkable change in the composition of marine invertebrates between the second and third of these units, a transition that only two brachiopod species are known to survive, has been attributed to the isolation of eastern Australia and to a drop in temperature. TheMarginirugus barringtonensisandLevipustula levisZones are redefined from reference sections in the Myall region, N.S.W.; theL. levisZone now includes theSyringothyris bifidaZone of Campbell (1961). Faunal sequences show that these two zones are closely related and that there is no hiatus between them, as formerly proposed by McKellar (1965). Conodonts identified by Mr. D. Crane indicate a late Viséan to early Namurian age for theMarginirugus barringtonensisZone, and an age of early Namurian for the base of theLevipustula levisZone; brachiopod evidence indicates that theL. levis Zoneextends into the Westphalian. The youngerAuriculispina levisZone from the Yarrol Basin may be coeval with theTrigonotreta campbelliZone from N.S.W. Faunas from both theL. levisandA. levisZones are present in Argentina and many species from theL. levisZone have affinities with forms from the Baikal region, U.S.S.R. Correlations based on the zones have eliminated the need for a hiatus between the Branch Creek and Baywulla Formations in the Yarrol Basin.

ISSN:0311-5518    

DOI:10.1080/03115517608619071

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

Psychroptilus burrettae gen. et sp. nov., from the Late Carboniferous of Tasmania, combines characters of the insect orders Palaeodictyoptera and Megasecoptera.Psychroptilusis referred to the Megasecoptera because it lacks paratergal processes on the pronotum, and because its wing venation is simple, with reduced cross veins. However, its wings are not narrowed at their bases, but are as broad as those of the Palaeodictyoptera. It is placed in a new suborder of the Megasecoptera, the Neosecoptera. This suborder differs from the Suborders Eumegasecoptera and Protohymenoptera in having: 1, broad wings that are not narrowed at base; 2, the hind wing slightly broader than the fore wing; and 3, anal veins that all arise from close to the wing base. The insect is possibly the oldest recorded in the southern hemisphere although age determinations of this and the only other known probable Late Carboniferous species,Hadentomoides dwykensisRiek, are not precise. The inclusion of the insect fossil in varve-like sediments and the very few associated fossil species, are indicative of a very cold habitat either at or adjacent to the area producing the sediments. The great majority of insect fossils are associated with abundant plant remains or other fossils indicative of warm conditions in the area of sedimentation. None is recorded from an area apparently as cold as that under whichPsychroptilus burrettaewas preserved.

ISSN:0311-5518    

DOI:10.1080/03115517608619072

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor

摘要:

An assemblage of spores recovered from the Undandita Member of the Brewer Conglomerate, the uppermost unit of the Pertnjara Group in the Amadeus Basin of central Australia, establishes the age of that formation as Late Devonian. Comparison with spore assemblages from sedimentary basins in Western Australia indicates that the central Australian assemblage is dateable within the post-early Frasnian to pre-late Famennian interval. Fish remains and spores previously described from the Parke Siltstone at the base of the Pertnjara Group are of probable early Frasnian age, so it now appears that the entire group was deposited during the Late Devonian. The Brewer Conglomerate is of synorogenic origin, and was deposited during uplift associated with the Alice Springs Orogeny; the spore data thus indicate that this tectonic event began in the Late Devonian. Isotopic age determinations in the Arltunga Nappe Complex and the Strangways Range of the Arunta Block have yielded Early Carboniferous dates. These possibly reflect a later stage of deformation than that which was responsible for the deformation and folding of the Brewer Conglomerate.

ISSN:0311-5518    

DOI:10.1080/03115517608619073

出版商:Taylor & Francis Group    

年代:1976

数据来源: Taylor