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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Asia
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Far East
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China
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Guizhou China (1)
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Nimbia occlusa
Ediacaran fossils and dubiofossils, Miette Group of Mount Fitzwilliam area, British Columbia
Ediacaran remains from intertillite beds in northwestern Canada
EDIACARAN FOSSILS FROM THE SOUTHWESTERN GREAT BASIN, UNITED STATES
Neonereites uniserialis from c. 600 Ma year old rocks in western Scotland and the emergence of animals
Ediacaran body and trace fossils in Miette Group (Windermere Supergroup) near Salient Mountain, British Columbia, Canada Revision of the paper was carried out by Dr. Guy Narbonne following the passing away of both Hans Hofmann ( † deceased May 19, 2010) and Eric Mountjoy ( † deceased June 18, 2010) after manuscript submission.
Abstract Sole markings from the Upper Cambrian Booley Bay Formation at Booley Bay, Co. Wexford, Ireland, previously described as the Ediacaran-type fossil Ediacaria booleyi appear to possess a number of morphological characteristics which are not consistent with assignment to the genus Ediacaria , nor any other known Ediacaran taxon. An inorganic origin for the structures has been proposed by several workers; we tentatively consider them to be at least in part organic, and are currently working to evaluate this hypothesis critically. If organic, the organisms must have had a density similar to that of the sediment in which they were emplaced, and to survive the transport process, they must have had a rigid integument. Neither of these properties appears to be consistent with an interpretation as an Ediacaran-type organism. We suggest here that the Booley Bay specimens should be removed from the genus Ediacaria . If Ediacaria booleyi is not related to known Ediacaran organisms, this would remove a key aspect of the argument against a mass extinction at the Precambrian/Cambrian boundary.
PHOSPHATIZED ANIMAL EMBRYOS FROM THE NEOPROTEROZOIC DOUSHANTUO FORMATION AT WENG'AN, GUIZHOU, SOUTH CHINA
Abstract As discussed in Chapter 11 of this report, some authors have considered that the uppermost part of the Southern Highland Group of the Dalradian in Scotland might be Lower Palaeozoic, possibly Early Cambrian to Early Ordovician. The age of the Irish Dalradian is also not fully clear (Daly 2001). Thus, in Ireland, strata that are clearly Cambrian in age are restricted in outcrop, being con?ned to some areas of the SE (Fig. 17) in the Leinster Terrane (Murphy et al . 1991; Woodcock 2000; Holland 2001, 2009). There they comprise the Bray and Cahore groups and part of the Lower Palaeozoic Ribband Group (Figs 18 & 19). In addition, in southernmost Leinster (Fig. 20), palynological studies have now shown that the Cullenstown Formation, which is not assigned to any of these groups, is also Cambrian. In the same area, the Ballycogly Group mylonites, which occur along the boundary between the Leinster Terrane and the Precambrian basement of the Rosslare Terrane, are considered to be Cambrian (Tietzsch-Tyler & Sleeman 1994 a ) although there is no direct biostratigraphical evidence. The Leinster Terrane is made up of several sub-terranes: particulars of these and the relevant references are given in Chapter 6 of this report. Within these terranes, Brack et al . (1979) grouped the Lower Palaeozoic rocks into three belts. More recent work has shown that, as far as the Ribband Group is concerned, a fourth belt can be established (McConnell et al . 1999).
Abstract The area of western Montes de Toledo to Guadalupe boasts a thick succession of mainly siliciclastic sediment spanning terminal Ediacaran to lower Cambrian strata as indicated by a relatively sparse but diverse palaeontological record. A terminal Ediacaran age is based on the occurrence of Cloudina in platform carbonates of the lower part of the Ibor group and in correlative levels of olistostromes at the base of the Río Huso group. Higher in the Río Huso group are found trace fossils which indicate a Cambrian age, notably Treptichnus bifurcus , which overlaps the local stratigraphic range of macroscopic carbonaceous disc-shaped fossils identified as Beltanelliformis . Strata underlying the Río Huso group contain treptichnids. The fossil record of the terminal Ediacaran–Lower Cambrian of this area is in part comparable to Cloudina -bearing sediments from other regions, in particular Namibia, where treptichnid trace fossils also overlap the range of Cloudina . The possibility of a wider biostratigraphic significance of this should be further tested, including its relation to the base of the Cambrian.
Abstract The Iberian Massif provides the largest outcrop of Variscan and pre-Variscan rocks in Europe (Fig. 2.1a ). It has been divided into several zones (Fig. 2.1b ) and, within the Spanish part of these zones,extensive areas are occupied by Precambrian rocks (Fig. 2.1c ). These Neoproterozoic successions are known under informal and local stratigraphic names so that it is not easy to provide a comprehensive synthesis of the Precambrian in Spain to a wide audience. Additional difficulties arise because different authors have focused their attention on different aspects (stratigraphy, petrology, tectonics, etc.) in widely separated geographic areas. Furthermore, widespread overprinting by Palaeozoic igneous and medium- to highgrade metamorphic processes has erased much sedimentological data and obscured correlations within and between Precambrian areas. As a consequence, many different local names have been proposed for stratigraphic units that are partially coincident with units in other localities. Thus, readers unfamiliar with geographic names may become discouraged when trying to compare and understand Precambrian stratigraphy from area to area in the Iberian Massif. To help readers, the names of the stratigraphic units and correlations across the zones are summarized in Figures 2.2 and 2.3 . Correlation chart of lithostratigraphic units from the Upper Neoproterozoic–Lower Cambrian in the different zones of the Spanish Iberian Massif. The Neoproterozoic–Cambrian boundary according to Bowring & Erwin (1998) . U-Pb isotopic data after Lancelot et al . (1985) , Schäfer et al . (1993) , Ordóñez (1998) , Fernández Suárez
Abstract On the Indian subcontinent, Late Proterozoic rocks form part of a continuous sequence grading into Cambrian, postdating the Sturtian glaciation (Cryogenian) and terminated by the Xingkaian/Pan African Orogeny (Late Cambrian). These sequences are restricted to the northwestern part of the Indian Shield, are overlain by Cenozoic sediments of the Indo-Gangetic Plain, and rest unconformably on the oldest platform sequences (Meso—Cryogenian) in many parts of the Lesser and Tethys/Higher Himalaya. Of these, the succession in the Krol Belt, Lesser Himalaya, divided into Baliana, Krol and Tal Groups, is fossiliferous. Changes in faunal composition of acritarchs and cyanobacteria are recorded in the upper part of the Baliana Group, as is the appearance and extinction of forms assigned to the Ediacara fauna in the overlying Krol. Such biotic change is accompanied by a significant depletion in δ 13 C values in the ‘cap carbonates’. Another δ 13 C depletion is recorded in the upper part of the Krol Group along with appearance of spiny acanthomorphic acritarchs, scaphomorphs and hercomorphs, small shelly fossils, a variety of Early Cambrian trace fossils and trilobites in the overlying Tal Group. A review of biota reported from the oldest platform sediments (Vindhyan Supergroup, Karnool, Bhima Groups) suggests a Meso-Cryogenian (pre-Sturtian glaciation) age.