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On Climacograptus inuiti sp. nov. and its Development

Published online by Cambridge University Press:  01 May 2009

Ian Cox
Ian Cox
Affiliation:
Sedgwick Museum, Cambridge.
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Extract

While accompanying the Oxford University Hudson Straits Expedition in 1931 to Akpatok Island in Ungava Bay, North Canada, the writer found that in the horizontally bedded limestones of Ordovician age one stratum alone was graptolitiferous. This contained a vast number of individuals in all stages of development, nevertheless all of the same species. When treated suitably with acid, specimens could be isolated from the matrix and thus a complete ontogeny has been worked out.

Type
Original Articles
Information
Geological Magazine , Volume 70 , Issue 1 , January 1933 , pp. 1 - 19
Copyright
Copyright © Cambridge University Press 1933

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References

page 2 note 1 Elles, and Wood, , Monograph of British Graptolites, 205, fig. 135; and pl. xxvii, fig. 3.Google Scholar

page 2 note 2 Bulman, O. M. B., “ On the Graptolites prepared by Holm: i, Certain ‘ Diprionidian’ Graptolites and their Development,” Arkiv för Zoologi, Band 24A, No. 8, Stockholm, 1932, pl. iii, fig. 23.Google Scholar

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page 4 note 5 Kraft, , op. cit., 222.Google Scholar

page 5 note 1 Kraft, , op. cit. “ Die Prosicula … hat eine Gestalt, die am besten mit einer zylindrischen Flasche zu vergleichen ist, deren Hals geschlossen, deren Boden aber geoffnet ist.“Google Scholar

page 5 note 2 Kraft, op. cit., 223.

page 5 note 3 Kraft, op. cit., Längs verstärkungsleisten.”

page 5 note 4 Kraft, , op. cit., “ Schraubenlinie.”Google Scholar

page 5 note 5 Kraft, , op. cit., 226.Google Scholar

page 5 note 6 Elles, G. L., “ The Graptolite Faunas of the British Isles,” Proc. Geol. Assoc., 1922.CrossRefGoogle Scholar

page 8 note 1 Wiman, C., op. cit.Google Scholar

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page 8 note 4 Kraft, , regards the metasicula as a theca, pointing out that it has essentially the same structure. Op. cit., 228.Google Scholar

page 8 note 5 The sicula is seen in reverse view if it be placed with nema directed distally and the virgella on the right hand.Google Scholar

page 9 note 1 Whittard, W. F., “ On the Structure of Glyptograptus aff. tamariscus (Nicholson),” Ann. Mag. Nat. Hist., Section 9, xix, 1927, 471.Google Scholar

page 9 note 2 Whittard, , op. cit., pl. xiii, figs. 61, 63, 66.Google Scholar

page 9 note 3 Davies, K. A., (Geol. Mag., LXVI, 1929), mentions a similar infold in the sicula of Gl. persculptus and Ortho. aff. truncatus, but his published sections give no evidence for this.Google Scholar

page 11 note 1 Kraft, op. cit., 230, and pi. vii, ii.

page 12 note 1 A perusal of the species of Climacograptus described in the Monograph of British Graptolites shows that but two have an embedded sicula. See also Whittard, op. cit., 475.Google Scholar

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page 14 note 2 For example Cl. orthoceratophilus; Bulman, op. cit., 18, fig. 9a, pl. iv. fig. 18.Google Scholar

page 16 note 1 Ulrich, and Ruedemann, , Bull. Geol. Soc. Amer., xlii, 1931.Google Scholar

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page 17 note 1 Bulman, O. M. B., “ On the Graptolites prepared by Holm: i, Certain Diprionidian' Graptolites and their Development,” Arkiv för Zoologie, and 24A, NO. 8, Stockholm, 1932.Google Scholar

page 18 note 1 Bulman, , op. cit., pl. l, figs. 27–9.Google Scholar

page 18 note 2 Bulman, , op. cit., pl. v, 23, 24; pl. vii, fig. 17; and pl. vi, 10, 11, 12.Google Scholar

page 18 note 3 Wiman, , “ Ueber Diplograptidae Lapw.,” Bull. Geol. Inst. Univ. Upsala, i, 2, 1893.Google Scholar

page 18 note 4 Hall, , “ Graptolites of the Quebec Group,” Geol. Surv. Can., pl. A, fig. 9, 1865.Google Scholar