摘要:

Two new species belonging to the new genusRivillinaare described from two Ordovician sites in the Armorican Massif:R. schallreuterisp. nov. (the type species) at Les Tanneries in the Domfront syncline from the lower part of the Pissot Formation (mid-Arenigian), andR. henningsmoenisp. nov. at Laillé in the Martigné-Ferchaud synclinorium from the lower part of the Traveusot Formation (Llanvirnian). At present, the systematic position ofRivillinais uncertain. It could have affinities with the order Bradoriidasensu stricto; alternatively, it may belong to the family Circulinidae Netskaya 1966 (suborder Binodicopina Schallreuter 1972; Order Beyrichiocopida Pokorny 1953).

ISSN:0311-5518    

DOI:10.1080/03115518308619628

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Palaeoenvironmental and palaeoecological analyses of late Frasnian (early Late Devonian) strata and fauna in New York and the central Appalachians of the United States reveal strikingly similar patterns of basin filling and evolution. Marine environments of both the upper West Falls Group in New York and the lower Foreknobs Formation in the central Appalachians were characterized by rapid delta progradation and steep offshore submarine gradients. Following a brief marine transgression, basin conditions of the overlying Java Group in New York and the upper Foreknobs Formation in the central Appalachians were quite different. Sedimentation decreased in intensity and the basin was much shallower, with a broad sublittoral shelf and gentle offshore gradients. The gentler environmental gradients of Java-late Foreknobs time yield a three-fold pattern of community development along an onshore-offshore transect in contrast to a two-fold pattern in the earlier late West Falls-early Foreknobs environments. Communities characteristic of deep water environments earlier in late West Falls-early Foreknobs time are displaced farther offshore in Java-late Foreknobs time, and outer platform and prodelta regions develop diverse species assemblages not present previously.

ISSN:0311-5518    

DOI:10.1080/03115518308619629

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

An incomplete ulna ofDiprotodon optatumOwen from a Pleistocene site in Reddestone Creek, northwest of Glen Innes, New South Wales, has deep cuts on opposite sides of the shaft. These marks are attributed toThylacoleo carnifexbecause some of the cuts were made by blade-like teeth at least 2 cm in length, because they fit well within the jaws ofThylacoleo, and because teeth ofT. carnifexhave been found at the same site. Many other bones of extinct marsupials from Reddestone Creek are gnawed, broken or smashed. Much of this damage could also be attributed toThylacoleo, and so it is necessary to be particularly cautious when attempting to use bone damage of extinct Australian marsupials as evidence for predation by man.

ISSN:0311-5518    

DOI:10.1080/03115518308619630

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Fragmentary remains of small dolphins from the Pinpa and Ericmas faunas of the fluvial-lacustrine Middle Miocene Namba Formation, Tarkarooloo Basin, Lake Frome area, represent an indeterminate genus and species of the extinct family Rhabdosteidae (= Eurhinodelphidae). They provide evidence of a marine connection of the Tarkarooloo Basin before or during the Middle Miocene and constitute the first record of rhabdosteids from Australia. Rhabdosteids have been recorded previously in the Southern Hemisphere only from Patagonia and, provisionally, New Zealand. Hitherto, rhabdosteids have not been reported from fluvial-lacustrine sediments.

ISSN:0311-5518    

DOI:10.1080/03115518308619631

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Examples of early astogeny in the speciesCarinatocella harmeri(Stach),Costaticella hastata(Busk) andClaviporella aurita(Busk) are discussed. The primary zoid differs in each species and if found fossil, only inC. hastatacould this zoid be recognised as a bryozoan fragment. Analogous development in other Bryozoa is discussed.

ISSN:0311-5518    

DOI:10.1080/03115518308619632

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Middle Cambrian (Ordian) fossils from the Ranken Limestone of the Georgina Basin previously referred to the genusArchaeocyathuswere reputedly one of the last Australian occurrences of the phylum Archaeocyatha prior to its extinction. These fossils in fact represent the anthaspidellid spongeArborella morsGatehouse 1968, hitherto known only from isolated spicules, and are by far the earliest known examples of the family Anthaspidellidae.Rankenellanom. nov. is introduced for the primary homonymArborellaGatehouse 1968. The genus confirms the preference of anthaspidellids for habitats in shallow-water reef and shelly facies evident in the known Ordovician occurrences of the group.

ISSN:0311-5518    

DOI:10.1080/03115518308619633

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

A review of described species and illustrated reports of Permian chonetidine brachiopods and an analysis of generic and species distribution permits the identification of five faunal provinces within the Gondwanan Realm: Andean, Paratinan, Austrazean, Westralian and Cimmerian. Consideration of species diversity in addition to generic distribution appears essential to define faunal provinces.

ISSN:0311-5518    

DOI:10.1080/03115518308619634

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor