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Trilobites from the Ordovician Balclatchie and lower Ardwell groups of the Girvan district, Scotland

Published online by Cambridge University Press:  03 November 2011

R. P. Tripp
R. P. Tripp
Affiliation:
R. P. Tripp, British Museum (Natural History), Cromwell Road, London SW7 5BD, England.
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Abstract

All trilobites known from the lower and upper Balclatchie and lower Ardwell groups of the Girvan district are listed and frequencies recorded. Eight new species are described, a number of generic assignments are new, and hitherto undescribed parts are illustrated. Of the 60 named species, 19 occur in the lower and upper Balclatchie and lower Ardwell groups; the upper Balclatchie Group yields the largest number of species. The assemblage is generally indicative of outer shelf conditions of deposition; a deeper water association at certain Balclatchie Group localities consists of 5 species identical with, or closely related to, species from the Liberty Hall facies of the lower Edinburg Formation of Virginia, U.S.A. This deeper water element constitutes a significantly larger proportion of the trilobite assemblages at certain localities than it does at others. A further 8 species from the Balclatchie Group are allied to lower Edinburg Formation forms, thus confirming the evidence of the brachiopods regarding the strong North American affinities of the fauna. The Balclatchie conglomerate is considered to be the result of a catastrophic event accompanied by slumping near the shelf edge causing the instantaneous entombment of the fauna.

Keywords

taxonomypalaeoecologycheekcranidiumhypostomepygidiumrostral platethoracic segment.
Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 71 , Issue 3 , 1980 , pp. 123 - 145
Copyright
Copyright © Royal Society of Edinburgh 1980

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References

Churkin, M. 1963. Ordovician Trilobites from graptolitic shale in central Idaho. J PALEONTOL 37, 421–8.Google Scholar
Cooper, B. N. 1953. Trilobites from the Lower Champlainian formations of the Appalachian Valley. MEM GEOL SOC AM 55 1–69.Google Scholar
Dean, W. T. 1974. The trilobites of the Chair of Kildare Limestone (Upper Ordovician) of eastern Ireland. PALAEONTOGR SOC MONOGR 128, 61–98.CrossRefGoogle Scholar
Etheridge, R. 1878. Notes on a few Silurian Fossils from the Neighbourhood of Girvan, Ayrshire, in the collection of Mrs. Robert Gray, Edinburgh. PROC R PHYS SOC 4, 164–77.Google Scholar
Evitt, W. R. & Tripp, R. P. 1977. Silicified Middle Ordovician trilobites from the families Encrinuridae and Staurocephalidae. PALAEONTOGRAPHICA 157, 109–74.Google Scholar
Fortey, R. A. 1973. Early Ordovician trilobite communities. FOSSILS AND STRATA 4, 331–52.Google Scholar
Ingham, J. K. 1978. Geology of a continental margin 2: middle and late Ordovician transgression, Girvan. In Bowes, D. R. & Leake, B. E. (eds). Crustal evolution in northwestern Britain and adjacent regions. GEOL J SPEC ISSUE 10, 163–76.Google Scholar
Nicholson, H. A. & Etheridge, R. 1878–1880. A monograph of the Silurian Fossils of the Girvan District in Ayrshire. London: Blackwood.Google Scholar
Owens, R. M. 1973a. Ordovician Proetidae (Trilobita) from Scandinavia. NORSK GEOL TIDSSKR 53, 117–81.Google Scholar
Owens, R. M. 1973b. British Ordovician and Silurian Proetidae (Trilobita). PALAEONTOGR SOC MONOGR 127, 1–98.Google Scholar
Portlock, J. E. 1843. Report on the Geology of the County of Londonderry and parts of Tyrone and Fermanagh. Dublin: Andrew Milliken.Google Scholar
Raymond, P. E. 1920. Some new Ordovician Trilobites. BULL MUS COMP ZOOL HARVARD 64, 273–96.Google Scholar
Raymond, P. E. 1925. Some Trilobites of the Lower Middle Ordovician of Eastern North America. BULL MUS COMP ZOOL HARVARD 67, 1–180.Google Scholar
Reed, F. R. C. 1903–1935. The Lower Palaeozoic Trilobites of the Girvan District, Ayrshire. PALAEONTOGR SOC MONOGR 1903, 1, 1–48; 1904, 49–96; 1906, 97–186; 1914, Suppl. 1–56; 1931b, Suppl. 2, 1–30; 1935, Suppl. 3, 1–64.Google Scholar
Reed, F. R. C. 1931a. Additional New Species of Trilobites from Girvan. ANN MAG NAT HIST (10) 7, 97–105.CrossRefGoogle Scholar
Shaw, F. C. & Fortey, R. A. 1977. Middle Ordovician facies and trilobite faunas in N America. GEOL MAG 114, 409–43.CrossRefGoogle Scholar
Thomas, A. T. & Owens, R. M. 1978. A review of the trilobite family Aulacopleuridae. PALAEONTOLOGY 21, 65–81.Google Scholar
Tripp, R. P. 1962. Trilobites from the confinis Flags (Ordovician) of the Girvan District, Ayrshire. TRANS R SOC EDINBURGH 65, 1–40.CrossRefGoogle Scholar
Tripp, R. P. 1967. Trilobites from the Upper Stinchar Limestone (Ordovician) of the Girvan District, Ayrshire. TRANS R SOC EDINBURGH 67, 43–93.CrossRefGoogle Scholar
Tripp, R. P. 1976. Trilobites from the basal superstes Mudstones (Ordovician) at Aldons Quarry, near Girvan, Ayrshire. TRANS R SOC EDINBURGH 69, 369–423.Google Scholar
Ulrich, E. O. 1930. Ordovician trilobites of the family Telephidae and concerned stratigraphic correlations. PROC U S NATL MUS 76, 1–101.CrossRefGoogle Scholar
Warburg, E. 1925. The Trilobites of the Leptaena Limestone in Dalarne. BULL GEOL INST UNIV UPSALA 17, 1–446.Google Scholar
Whittington, H. B. 1950. Sixteen Ordovician genotype trilobites. J PALEONTOL 24, 531–65.Google Scholar
Whittington, H. B. 1954. Ordovician trilobites from Silliman's Fossil Mount. In Miller, A. K., Youngquist, W. and Collinson, C. (eds). Ordovician cephalopod fauna from Baffin Island. MEM GEOL SOC AM 62, 119–49.Google Scholar
Whittington, H. B. 1956. Silicified Middle Ordovician Trilobites: the Odontopleuridae. BULL MUS COMP ZOOL HARVARD 114, 155–288.Google Scholar
Whittington, H. B. 1959. Silicified Middle Ordovician Trilobites: Remopleurididae, Trinucleidae, Raphiophoridae, Endymioniidae. BULL MUS COMP ZOOL HARVARD 121, 371–496.Google Scholar
Whittington, H. B. 1965. Trilobites from the Ordovician Table Head Formation, western Newfoundland. BULL MUS COMP ZOOL HARVARD 132, 275–442.Google Scholar
Whittington, H. B. & Evitt, W. R. 1954. Silicified Middle Ordovician Trilobites. MEM GEOL SOC AM 59, 1–137.Google Scholar
Williams, A. 1962. The Barr and Lower Ardmillan Series (Caradoc) of the Girvan District, South-west Ayrshire, with descriptions of the Brachiopoda. MEM GEOL SOC LONDON 3, 1–267.Google Scholar
Wyville Thomson, C. 1857. On some species of Acidaspis from the Lower Silurian Beds of the South of Scotland, Q J GEOL SOC LONDON 13, 206–10.CrossRefGoogle Scholar
Wyville Thomson, C. 1864. Figures and descriptions illustrative of British organic remains. MEM GEOL SURV GB. Decade 11. Plate. 6.Google Scholar