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(Early Floian) Graptolite Sequence in Victoria

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(Early Floian) Graptolite Sequence in Victoria See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/322268173 Revision of zonal and related graptolites of the Lancefieldian–Bendigonian (early Floian) graptolite sequence in Victoria Article in Proceedings of the Royal Society of Victoria · January 2017 DOI: 10.1071/RS17007 CITATIONS READS 0 12 1 author: Alfons Vandenberg Museum Victoria 55 PUBLICATIONS 1,423 CITATIONS SEE PROFILE Some of the authors of this publication are also working on these related projects: Ordovician graptolites of Victoria View project All content following this page was uploaded by Alfons Vandenberg on 20 January 2018. The user has requested enhancement of the downloaded file. csiro publishing the royal society of victoria, 129, 39–74, 2017 www.publish.csiro.au/journals/rs 10.1071/rs17007 revision of zonal and related graptolites of the TOPMost lancefieldian and Bendigonian (early floian) graptolite sequence in victoria, australia A.H.M. VAndenBerg research associate, geoscience, Museums victoria, gpo Box 666, Melbourne victoria 3001, australia correspondence: [email protected], [email protected] ABSTRACT: the topmost lancefieldian (la3, earliest floian, early ordovician) Paratetragraptus approximatus Biozone of victoria contains a previously undocumented graptolite fauna that includes, in addition to the nominative species, Paratetragraptus cooperi sp. nov., P. thomassmithi sp. nov., P. acclinans, P.? henrywilliamsi sp. nov., and Tshallograptus cymulus gen. et sp. nov., interpreted as the direct ancestor of Tshallograptus fruticosus (J. hall). taxa such as Kinnegraptus, Laxograptus, Pseudobryograptus, Phyllograptus, Tetragraptus and Loganograptus also make their first appearance in this zone. the succeeding Bendigonian stage, traditionally subdivided into four biozones using overlapping ranges of P. approximatus and the four- and three-stiped morphs of the T. fruticosus clade, is revised to accommodate the earlier than documented appearance of the 3-stiped morph, here renamed Tshallograptus tridens sp. nov., in the Be1 Biozone. the new subdivision consists of three biozones: Be1 P. approximatus + T. fruticosus Biozone, Be2+3 T. fruticosus + T. tridens Biozone, and Be4 T. tridens Biozone. T. tridens is vanishingly rare in Be1 and Be2 but appears in abundance in Be3 which is retained as a local subzone. Keywords: lancefieldian, Bendigonian, early floian, Paratetragraptus, Tshallograptus gen. nov., victorian graptolite zones the early floian (la3–Be4) graptolite succession of four biozones of the Bendigonian, and introduced the letter– victoria encompasses one of the most remarkable numbering shorthand system in current use (vandenBerg diversification events of graptolites, with the appearance & cooper 1992) (figure 1a). of at least 70 new species (vandenBerg & cooper 1992). elsewhere, investigations of early floian sequences for correlation purposes, the two most important of these have found differences in the stratigraphic ranges of T. are Paratetragraptus approximatus and two species of fruticosus and T. tridens. in the valhallfonna formation in Tshallograptus gen. nov. that were formerly regarded spitsbergen, cooper and fortey (1982) found an upward as morphs of Pendeograptus fruticosus. these are the change in the frequency of the two species that is similar 4-stiped T. fruticosus (hall) and the 3-stiped T. tridens to that recorded in victoria. Williams and stevens (1988), sp. nov. they warrant full species rank, as they are easily however, found no such change in the cow head group distinguished and have different stratigraphic ranges. for of western newfoundland and suggested the subdivision convenience, they, together with the unnamed 2-stiped of the T. fruticosus Biozone as used in victoria should be morph, are referred to as the ‘T. fruticosus clade’. abandoned. victoria is unique in having used the overlapping in addition to the three members of the T. fruticosus ranges of P. approximatus, T. fruticosus and T. tridens to clade (T. fruticosus, T. tridens and the unnamed 2-stiped subdivide the sequence into five biozones, la3 and Be1– morph), the early floian in victoria contains two other Be4 (see appendix 1 for the use of the letter–number species of Tshallograptus: a small precursor of T. system). the most unusual aspect of this is that the fruticosus here named T. cymulus sp. nov., and the two- subdivision has utilised not just the appearance but also stiped T. furcillatus sp. nov. the top of the Bendigonian is the disappearance of particular zone fossils. the different marked by the appearance of Didymograptellus kremastus stratigraphic distributions of T. fruticosus and T. tridens (formerly D. protobifidus) (vandenBerg 2017). were first recorded by harris (1916). in their introduction of the Bendigo ‘series’, harris and Keble (1932) recognised definition of the lancefieldian– five zones based on the overlap of the two morphs of the Bendigonian BOUNDARY T. fruticosus clade, and with Tetragraptus approximatus the lancefieldian–Bendigonian transition in the lowermost below and Didymograptus bifidus above. harris and floian is poorly documented. it was first defined by harris thomas (1938b) moved this topmost zone, then renamed and Keble (1932) as an interval containing Paratetragraptus the Didymograptus protobifidus zone, into their new approximatus, accompanied by Tshallograptus fruticosus overlying chewton ‘series’ but maintained the remaining in the basal Bendigonian zone (Be1) but without published open access cc By-nc-nd 40 a.h.M. vandenBerg figure 1: subdivision of the early floian. a shows the subdivision into five biozones (la3 and Be1˗4) according to harris and thomas (1938b), thomas (1960a) and vandenberg and cooper (1992), based on the overlapping stratigraphic ranges of Paratetragraptus approximatus, Tshallograptus fruticosus and T. tridens. B shows the revised subdivision that recognises the early appearance of Tshallograptus tridens in Be1 and also shows ranges of other species described. T. fruticosus in the topmost lancefieldian zone (la3). t.s. hall, which my work indicates is an early growth these authors provided the additional information that the stage of Paratemnograptus magnificus (pritchard) — it is uppermost lancefieldian contains Tetragraptus decipiens, only found in la2. T. quadribrachiatus, T. acclinans, Clonograptus tenellus the collection from Bull dog creek is very small, with and rare ‘Bryograptus’. they further gave Bull dog creek only seven identifiable specimens, all poorly preserved. on the Mornington peninsula as its ‘typical locality’. one of these is an early growth stage of Tshallograptus there are several problems with this information. fruticosus. this automatically rules out the collection, ‘Bryograptus’, at the time of the harris and Keble paper, and its locality, being considered as representative of the referred to ‘Bryograptus’ victoriae t.s. hall and ‘B.’ clarki la3 Paratetragraptus approximatus Biozone which, by t.s. hall, now united as Aorograptus victoriae (t.s. hall) definition, should not containTshallograptus fruticosus. (Williams & stevens 1991). there is not a single locality in later authors have added little detail. harris and which A. victoriae occurs together with Paratetragraptus thomas (1938b) revised the entire ordovician graptolite approximatus. the same holds for ‘Tetragraptus’ decipiens succession of victoria. they stated that ‘in the highest revision of zonal and related graptolites of the TOPMost lancefieldian and Bendigonian 41 (early floian) graptolite sequence in victoria, australia lancefieldian [la3], the Bryograpti are not so abundant, but the suBdivision of the Bendigonian the incoming of Tetragraptus approximatus and variants the multi-zone subdivision of the Bendigonian stage between it and T. acclinans […] is very noticeable. apart first proposed by harris and Keble (1932) was based on from these forms the general assemblage resembles that of inference, piecing together the results of identifications [the preceding zone] la2’. thomas (1960a) included a table from numerous graptolite localities, mainly in the that shows age ranges of virtually all graptolite species then Bendigo region, collected mostly by geological survey of recognised from victoria. in the la3 column he showed victoria geologists as a byproduct of mapping to aid gold the presence of Araneograptus macgillivrayi, Aorograptus exploration in the early twentieth century. in the Bendigo victoriae, Kiaerograptus pritchardi, Clonograptus region, graptolites occur in the castlemaine group, a flexilis, C. rigidus, C. tenellus, Paratemnograptus turbidite sequence estimated to be more than 3 km thick, magnificus, Paratetragraptus approximatus, P. acclinans, with the Bendigonian portion accounting for approximately Expansograptus vicinus, E. extensus and E. similis. this 600 m. With exception of the basal lancefieldian portion, list is much larger than those by earlier authors, but the the lithology of the sequence is so monotonous that it can accompanying description gives no information on any only be subdivided on the basis of graptolites that occur supposed la3 localities from which these forms were in sporadic black shale intervals. exposures are small identified. vandenBerg and cooper (1992) largely copied and scattered, and folds are tight and very closely spaced the information given by thomas (1960a), but with a few (vandenBerg et al. 2000). differences: they showed the presence of Araneograptus given these obstacles,
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