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VIII.—On the Discovery of Turrilepas in the Utica Formation (Ordovician) of Ottawa, Canada

Published online by Cambridge University Press:  01 May 2009

Henry Woodward
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Extract

Mr. Ami's interesting discovery has already been announced in a letter addressed to Mr. A. H. Foord, F.G.S., published in this Magazine (October, 1888). Mr. Ami now supplies a “Note” on the precise geological position of the beds in which the Turrilepas was found. Want of space, however, precludes us from giving the whole of his detailed observations, which are accompanied by a sketch section, here reproduced:—

The following is a summary of Mr. Ami's “Note.”

The Turrilepas was found in a band of bituminous limestone cropping out on the right bank of the Rideau River, at the Rifle Range, near Ottawa. The precise position of the beds (Lower Utica = about the lower part of the Bala Series), was ascertained by means of their fossil contents, which include an interesting Brachiopod—Siphonotreta Scotica, identified and named by the late Dr. T. Davidson, F.R.S.

Type
Original Articles
Information
Geological Magazine , Volume 6 , Issue 6 , June 1889 , pp. 271 - 275
Copyright
Copyright © Cambridge University Press 1889

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References

page 271 note 1 Mr. Ami regards them as equivalent to the Llandeilo of Craighead, Ayrshire.

page 273 note 1 Sitz. Berichte d. k. k. Akad. Wissensch. vol. xlix. p. 215.Google Scholar

page 274 note 1 This ornamentation, as I have pointed out (see Geol.Mag. 1880, Dec. II. Vol. VII. p. 197Google Scholar) occurs also on the body-plates of the anomalous Cystidean, Ateleocystites, which is found in the same Wenlock Limestone of Dudley, and in the Trenton Limestone of Ottawa.