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III.—On Some Isochilinæ from Canada and Elsewhere in North America
Published online by Cambridge University Press: 01 May 2009
Extract
Among a large number of Canadian fossils sent to me by Col. C. C. Grant, of Hamilton, Ontario, for transmission to the British Museam (Natural History Branch), there were three particular specimens of fossiliferous limestone worthy of careful examination. These came from a glacial drift at Hamilton, known as ‘Bala Drift.’ There being no real ‘Bala’ strata in Canada, the appellation of ‘Bala Drift’ at Hamilton applies to a glacial drift containing fossils more or less allied to those of Bala, most probably to the Trenton Limestone, a Lower Silarian (or Ordovician) formation.
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References
page 301 note 1 This anterior convexity is unusual.
page 302 note 1 Zeit. d. D. Geol. Ges., 1889, p. 19, pl. ii, figs. 9–11.
page 302 note 2 Quart. Journ. Geol. Soc., vol. ix (1853), p. 160, pl. vii, figs. 5 and 6; and Biv. Entom. Geol. Assoc., 1869, p. 15, figs. 23a–b.
page 303 note 1 Ann. Mag. Nat. Hist., April, 1858, p. 248, pl.x, fig. 1—not so well figured there as on later occasions.
page 304 note 1 The definition of varieties is carefully given at p. 67, and the localities enumerated.
page 304 note 2 Footnote at p. 181: “Since the above was written I have received from Professor T. Rupert Jones proofs of the plates which have been prepared for the Geological Survey of Canada. On plate x I notice figs. 10a and 11a, because I am marked ‘I. Ottawa variety,’ but for the reasons stated above I cannot accept this designation for my specimens.”