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Aspects of Ordovician conodonts and the stratigraphy of Thailand, Malaysia, and Tasmania

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Cantrill, Robin C.(Robin Crawford) (2003) Aspects of Ordovician conodonts and the stratigraphy of Thailand, Malaysia, and Tasmania. PhD thesis, University of Tasmania.

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Abstract

Ordovician conodonts from the shallow tropical Lower Setul Limestone from the
Langkawi Islands, Malaysia range from the Tremadoc to Ashgill. Species included
Acodus oneotensis, Ansella jemtlandica, Baltoniodus prevariabilis, Cordylodus
lindstromi, Cornuodus longibasis, Dapsilodus mutatus, Drepanodus toomeyi,
Drepanoistodus basiovalis, Hamarodus europaeus, Juanognathus variabilis,
Jumudontus gananda, Oepikodus evae, Oistodus cf. lanceolatus, Panderodus gracilis,
Panderodus nogamii, Protopanderodus liripipus, Scolopodus rex, Scolopodus bassleri,
Scolopodus staufferi, Semiacontiodus cf. bulbosus and Triangulodus variabilis.
Walliserodus ethingtoni ranges from the Upper Ordovician to the Lower Silurian.
Two hundred and seventy Ordovician conodonts specimens collected from the shallow
tropical Thung Song Limestone of mainland Thailand and Ko Tarutao, Thailand range
from the Lower Ordovician to the Upper Ordovician. Species include Acanthodus
uncinatus, Acodus deltatus, Acontiodus latus, Amorphognathus tvaerensis, AnseIla
jemtlandica, Baltoniodus prevariabilis, Bergstroemognathus extensus,
Bergstroemognathus kirki, Cordylodus caseyi, C. drucei, C. lindstromi, C. prion, C.
rasmosus, Drepanodus sp., Erraticodon cf. hexianensis, Juanognathus serpagli,
jaanussoni, J. variabilis, Oistodus sp., Loxodus bransoni, Oepikodus evae, Panderodus
nogamii, Paracordylodus elongatus, Parapaltodus simplicissimus, Periodon cf.
flabellum, Phragmodus flexuosus, Protopanderodus elongatus, P. cooperi, P. robustus,
Scalpellodus striatus and Triangulodus variabilis.
A small number of conodont specimens were recovered from the deeper water Pa Kae
Formation in Thailand. These include a single specimen of Amorphognathus ordovicicus.
Other species include Ansella jemtlandica, Baltoniodus navis, Cornuodus longibasis,
Dapsilodus mutatus, Drepanodus amplissimus, Drepanoistodus basiovalis,
Harmarodus europaeus, Protopanderodus insculptus, Protopanderodus liripipus, and
Walliserodus ethingtoni. All species indicate a range from Darriwilian to the Ashgill.
FORTEY'S (1997) study of deeper water trilobites (Upper Caradoc to the Lower Ashgill)
from the Pa Kae Formation agrees with this range.
A small Ordovician conodont fauna from the Flowery Gully Limestone at Beaconsfield
in northern Tasmania includes Acodus combsi, Acontiodus iowensis, Drepanodus sp.,
Juanognathus variabilis, Protopanderodus varicostatus, Scolopodus gracilis and
Scolopodus rex that range from the Arenig to Darriwilian.
250 conodont specimens from the Karmberg Limestone of central southern Tasmania
include Aurilobodus ?leptosomatus, Bergstroemognathus extensus, Bergstroemognathus
kirki, Glyptoconus quadriplicatus, Juanognathus jaanusonni, Protopanderodus
elongatus, Protopanderodus gradatus, Ruetterodus andinus, Rossodus manitouensis,
Scolopodus floweri, Scolopodus krummi, Scolopodus giganteus and Variabiloconus
variabilis. Several conodont species have not been reported in earlier reports on
Tasmanian Ordovician conodont faunas. The age of the conodont fauna reviewed
indicated an age from the 0. evae through to the E. variabilis Zone. Older species such
as Oenotodus nakamuri, Variabiloconus variabilis and Glyptoconus quadriplicatus
appear in the lowest units of the Karmberg Limestone but they may have come from
reworked material from the top of the Upper Florentine Valley Formation.
Three species of the genus Phragmodus from the Gordon Limestone Group (Middle to
Upper Ordovician) of Tasmania; Phragmodus flexuosus, Phragmodus undatus and a
new species of Phragmodus tasmaniensis are described. These species permit the
correlation of North American Midcontinent conodont faunas with species that occupied
comparatively shallow, warm water, offshore biofacies around the continental margins of
Gondwana.
Panderodus nogamii (LEE) has a pen—Greater Gondwana distribution in the shallow
temperate to tropical water limestones of Argentina, Thailand, Tasmania, Australia,
Malaysia and the north and south China blocks.
Conodonts from the Lower Setul Limestone in the Langkawi Islands, the Thung Song
Group on Ko Tarutao and mainland Thailand, and Tasmania show close affiliation to the
Ordovician conodont fauna from Argentina and with Australian conodont fauna from the
Canning Basin, and the Georgina Basin. Conodonts species including
Bersgtroemognathus extensus, Drepanodus arcuatus, Juanognathus variablis, and
Scolopodus rex from the deep water Hensleigh Siltstone of central N.S.W. (Early
Ordovician, Bel to Be2) occur in Tasmania, Southeast Asia, and Argentina. Several genera
are represented in the Ordovician conodont faunas reported from Utah and Nevada in the
U. S.A.
The CAI values range of 2.0 to 5.0 for the conodonts from the Langkawi Islands,
Malaysia may reflect their proximity to Mesozoic granitic intrusions. The conodonts from
the Thung Song Formation have a range from 1.5 to 2.0 on Ko Tarutao and mainland
Thailand. The range of 2.0 to 3.0 for conodonts from the Pa Kae Formation may be a
function of the thickness of the overburden which covered the formation

Item Type: Thesis (PhD)
Keywords: Conodonts, Conodonts, Conodonts, Paleontology, Paleontology, Paleontology, Paleontology, Geology, Stratigraphic
Copyright Holders: The Author
Copyright Information:

Copyright 2003 the Author - The University is continuing to endeavour to trace the copyright
owner(s) and in the meantime this item has been reproduced here in good faith. We
would be pleased to hear from the copyright owner(s).

Additional Information:

Thesis (Ph.D.)--University of Tasmania, 2003. Includes bibliographical references

Date Deposited: 25 Nov 2014 00:52
Last Modified: 11 Mar 2016 05:54
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