Subdivisions of the Ordovician System in Australia

Webby, B D; Vandenberg, A.H.M.; Cooper, Roger A.; Stewart, Ian; Shergold, JH; Nicoll, Robert S.; Burrett, Clive; Stait, Bryan; Shaffer, None W. W. Cooper, B. L.; Laurie, JR; Sherwin, Lawrence

doi:10.4095/132176

Cited by 5 publications

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“…data) and are therefore here treated as a single succession. Development of the biostratigraphic scheme and its present status are reviewed by VandenBerg in Webby et al (1981). Eighteen zones, four of which are split into subzones, are currently recognized in the pre-gracilis interval, which is divided into six stages and contains about 220 graptoloid species.…”

Section: Australasiamentioning

confidence: 99%

A precise worldwide correlation of early Ordovician graptolite sequences

Cooper

Lindholm

1990

Geol. Mag.

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Fourteen early Ordovician (Tremadoc-Llandeilo) graptolite sequences from around the world are precisely (infrazonally) correlated, based on the stratigraphic ranges of 130 species and species groups. The composite standard sequence (CSS) of graptolites has been determined from the six best regional sequences by a nonparametric graphic correlation. Two data sets were selected: one comprised first appearance events of 103 taxa, the other, first and last appearance events of 45 taxa. The results of the two runs accord well and reveal respectively 66 and 73 successive bioevents in early Ordovician time. Event spacing averages 0.7-0.8 Ma and enables fine subdivision, correlation and homotaxial testing for diachroneity. The strong correlation between each of the six regional sequences and the CSS indicates the high level of accordance among graptolite successions around the world.

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Section: Australasiamentioning

confidence: 99%

A precise worldwide correlation of early Ordovician graptolite sequences

Cooper

Lindholm

1990

Geol. Mag.

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“…They include Cambroblastus enubilatus Smith and Jell, 1990 from the late Cambrian of Australia, and Lampteroblastus hintzei Guensburg and Sprinkle, 1994 from the early Floian (Early Ordovician) of Utah. Late Ordovician occurrences include Astrocystites distans from Australia, based on poorly preserved specimens (Webby 1968;Webby et al 2000), as well as possible isolated remains from Virginia (Sprinkle 1973) and Sweden (Paul 1976). …”

Section: Introductionmentioning

confidence: 99%

Ontogeny, functional morphology, and comparative morphology of lower (Stage 4) and basal middle (Stage 5) Cambrian gogiids, Guizhou Province, China

Parsley

2012

J. Paleontol.

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Three gogiid eocrinoids, numbering in the thousands of specimens, are well known from the lower Cambrian (Stage 4) Balang Formation (Guizhoueocrinus yui) and basal middle Cambrian (Stage 5) Kaili Formation (Kaili Biota) (Sinoeocrinus lui and Globoeocrinus globulus) that resided on the Yangtze-South China Plate (modern Guizhou Province, China). In each species a complete ontogenetic sequence, using thecal height (TH) as a scale, juvenile stage (early, middle, and late substages), mature stage (early, middle, and late substages), and a gerontic stage can be identified. Sutural pores appeared in an orderly sequence; below the ambulacrals, above the stalk and generally over the theca, in that order. In younger species their emplacement and growth was commonly precocious relative to G. yui. Also, their shape ranges from circular to oval to triangular in a single growth sequence, after the establishment of the 2-1-2 pattern; brachioles were added in series of five and were also precocious in time of occurrence in younger species. Thecae in younger species tend to retain juvenile aspects relative to G. yui. All of these species lived in outer shelf settings in fine-grained, organic-rich siliciclastics.

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“…The first specimens were collected in 1959 from Mount Charlotte, with more material coming from Mount Watt in the 1960s (Fig. 2), including the type specimen described by Ritchie & Gilbert-Tomlinson (1977), who also recorded a second taxon, Porophoraspis A diverse invertebrate body fossil fauna has been described from the full extent of the Stairway Sandstone and, taken as a whole, this is a shallow marine assemblage typical of the Ordovician (Webby et al 2000), including trilobites, brachiopods, rostroconch and pelecypod molluscs, gastropods, cephalopods and monoplacophora (see extensive faunal lists presented by , Shergold 1986. Other fossils present include acritarchs, sponges and conodonts (Ritchie & Gilbert-Tomlinson 1977, Shergold 1986, Nicoll 1991) in addition to the arandaspid fish mentioned above.…”

Section: Sedimentology and Palaeontologymentioning

confidence: 99%

Ichnofacies of the Stairway Sandstone fish-fossil beds (Middle Ordovician, Northern Territory, Australia)

Davies

Sansom

Nicoll

et al. 2011

Alcheringa: An Australasian Journal of Palaeontology

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Subdivisions of the Ordovician System in Australia

Cited by 5 publications

References 0 publications

A precise worldwide correlation of early Ordovician graptolite sequences

A precise worldwide correlation of early Ordovician graptolite sequences

Ontogeny, functional morphology, and comparative morphology of lower (Stage 4) and basal middle (Stage 5) Cambrian gogiids, Guizhou Province, China

Ichnofacies of the Stairway Sandstone fish-fossil beds (Middle Ordovician, Northern Territory, Australia)

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