摘要:

Well-preserved, three-dimensional microfossils are reported from a 3.7 m thick black phosphorite bed in the Sinian Doushantuo Formation at Wengan Phosphate Mine, Guizhou Province, southwest China. The diverse assemblage, observed in thin sections, comprises planktonic acritarchs, benthic cyanobacteria, bacteria, and thallophytes. Twenty one taxa are recognized, including 1 new genus and 4 new species. Acritarchs includeBaltisphaeridium rigidumsp. nov.,Vulcanisphaera phacelosasp. nov.,Comasphaeridium magnumZhang 1984,Cymatiosphaeroides yiniisp. nov.,Dicrospinasphaera zhangiigen. et sp. nov.,Echinosphaeridium maximum(Yin, 1987) Knoll, 1992,Ericiasphaerasp., ?Ericiasphaerasp.,Hocosphaeridium scaberfaciumZang & Walter, 1992,Meghystrichosphaeridiumsp.,Meghystrichosphaeridium wenganensisChen & Liu, 1986,Polyhedrosphaeridiumsp. The cyanobacteria and bacteria compriseParatetraphycus giganteusZhang, 1984,Gloeodiniopsis lamellosa(Schopf, 1968) Knoll & Golubic, 1979,Globophycussp.,Myxococcoidessp., type A,Siphonophycus rugosum(Maithy, 1975) Hofmann & Jackson, 1994,Siphonophycus robustum(Schopf, 1968) Knoll, Swett & Mark, 1991,Gunflintiasp., and a rod-like bacterium (type B). At least 6 distinctive acritarch taxa from the black phosphorite bed are also represented in the Pertatataka assemblage reported by Zang & Walter (1992) in the Amadeus Basin of central Australia, suggesting a biostratigraphic correlation with the Pertatataka Formation, which underlies strata containing Ediacaran metazoans and overlies Varangerage glacial sediments. Abundant bacteria-like coccoids and filaments preserved in the vesicles of many acritarch specimens attest to the presence of a thriving microbiota of decomposers within dead acritarchs, and a specimen ofThallophyca ramosaZhang 1989 has well-preserved reproductive structures that comparable with those of the modern rhodophyteBangiaand the phaeophyteFucus.

ISSN:0311-5518    

DOI:10.1080/03115519808619200

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

New finds of graptolites in the Cudgegong district, N.S.W., indicate a Bo3 (mid-Bolindian: Late Ordovician) age for the upper part of the Sofala Volcanics and an early Prídolí (Late Silurian) age for the upper part of the Willow Glen Formation. The Silurian graptolite is described asMonograptus parultimus minutussubsp. nov. Integration of the new biostratigraphic data with SHRIMP ages for volcanic units in the Cudgegong sequence supports an age of 410 Ma for the Silurian-Devonian boundary.

ISSN:0311-5518    

DOI:10.1080/03115519808619201

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

The new genusSulaitescomprises the mainly Late Oxfordian species group of“Perisphinctes” sularusandmoluccanus, Boehm spp., originally described from the Sula Islands of eastern Indonesia, and the Late Oxfordian-?Early Kimmeridgian species group of “Pseudoparaboliceras aramaraii” Gerth, originally described from Irian Jaya. The designated type-species ofSulaitesisPerisphinctes sularusBoehm 1907. All syntypes ofP. sularusandmoluccanushave been destroyed. Because no microconchs resembling Boehm's illustrated specimens are available from Sula, a complete microconch from Papua New Guinea is designated as the neotype. “P.”moluccanusis included in the type-species. Both Gerth's (1965) genus-group namePseudoparabolicerasand species epithetaramaraiihave no designated types and are thereforenomina nuda. The substitute name proposed isSulaites gerthin. sp.Sulaitesis known from Papua New Guinea, and probably New Zealand and Nepal.

ISSN:0311-5518    

DOI:10.1080/03115519808619202

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Fertile fern foliage described asLophosoria cupulatussp. nov. contains the distinctive sporeCyatheacidites annulatus. The fossil foliage is morphologically similar to the Early Cretaceous form-generaGleichenitesandMicrophyllopteris, whose time and space distribution in Gondwana matches that of the dispersed sporeCyatheacidites. Some of the Cretaceous southern hemisphere material assigned toGleichenitesandMicrophyllopterisis probably allied to families such as the Lophosoriaceae rather than the Gleicheniaceae as had been previously supposed. The nearest living relative,Lophosoria quadripinnata, grows within a mean annual temperature range of 8–22° C, and a mean annual precipitation range of 195–1977 mm. The presence ofLophosoria cupulatusat palaeolatitudes of 55–65° S implies that during the Aptian the southern high latitudes were a minimum of 12° C warmer than the present day.

ISSN:0311-5518    

DOI:10.1080/03115519808619203

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

A new genus and species of Old World leaf-nosed bats is described from skull material collected from a Miocene limestone cave deposit at Riversleigh in northwestern Queensland.Riversleigha williamsigen. et sp. nov. is one of nine hipposiderid species identified from the Bitesantennary Site deposit. Its phylogenetic relationships to other hipposiderids remain unclear but it probably represents an early branch of this Old World tropical family. It is a relatively large hipposiderid and at least some of its features suggest it was capable of consuming well-armoured beetles among other insect prey.

ISSN:0311-5518    

DOI:10.1080/03115519808619204

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Ganbulanyi djadjinguligen. et sp. nov. is described on the basis of an upper molar and premolar from an early-late Miocene site in Riversleigh, northwestern Queensland. The paucity of material constrains certainty in the determination of it's phylogenetic position. But, among dasyuromorphians, and dependent on the interpretation of tooth homology, this species shows unequivocal synapomorphies only with the derived dasyurineSarcophilus, and/orBarinya wangala, a possible sister taxon to the modern dasyurid radiation (i.e., Sminthopsinae, Phascogalinae, Dasyurinae). Other apomorphies, evident inG. djadjinguli, are common to both carnivorous thylacinids and dasyurids within the order. Some dental features ofGanbulanyi djadjinguliare treated as adaptations to a ‘bone cracking’ habitus. If this interpretation is correct, then this species represents the only pre-Pliocene Australian taxon known to occupy such a niche and perhaps the smallest specialist ‘bone-cracker’ within Mammalia.

ISSN:0311-5518    

DOI:10.1080/03115519808619205

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor