Hostname: page-component-78c5997874-94fs2 Total loading time: 0 Render date: 2024-11-08T07:28:24.340Z Has data issue: false hasContentIssue false
  • English
  • Français

IV.—On the Occurrence of Boring Mollusca in the Oolitic Rocks1

Published online by Cambridge University Press:  01 May 2009

J. Morris
Get access Rights & Permissions [Opens in a new window]

Extract

The occurrence of perforations due to Lithophagous mollusca has been frequently observed in the Oolitic rocks, viz. in the Inferior and Great Oolite, Cornbrash, Coral-rag, and Portland beds. During a recent visit, with some of the students of the Agricultural College, Cirencester, to a quarry near there, further evidence of a similar fact was obtained. The quarry is situated near the canal on the farm land of Mr. Sargeant, and has been long worked for road stone and building stone, and, according to the Geological Survey, belongs to the Forest Marble division of the Great Oolite series, and exhibits the structure known as “false-bedding or oblique lamination,” and occasionally the flagstones in this and other neighbouring quarries show ripple-marks and tracks of marine animals.

Type
Original Articles
Information
Geological Magazine , Volume 2 , Issue 6 , June 1875 , pp. 267 - 272
Copyright
Copyright © Cambridge University Press 1875

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

page 268 note 1 See fig. 338, p. 330, Lyell, Elements of Geology, 1874.

page 268 note 2 Sir C. Lyell, in alluding to the Crinoidal plates at Bradford, overgrown with Serpulæ and Polyzoa, says, “Now these Serpulæ could only have begun to grow after the death of some of the stone-lilies, parts of whose skeletons had been strewed over the floor of the ocean before the irruption of argillaceous mud. In some instances we find that, after the parasitic Serpulæ were full grown, they had been incrusted over with a polyzoan, called Diastopora diluviana; and many generations of these molluscoids had succeeded each other in the pure water before they became fossil! (Elements of Geology, 1874, p. 330.)

page 268 note 3 Geology of Oxford and the Valley of the Thames, 1871.

page 269 note 1 Mag. Nat. Hist. 1839, p. 551.

page 269 note 2 , Hull, Geology of Country around Cheltenham, pp. 64, 65; Mem. Geol. Survey, 1857.Google Scholar

page 269 note 3 , Lycett, The Cotteswold Hills, 1857, p. 93.Google Scholar

page 269 note 4 Lycett, ibid. p. 99.

page 269 note 5 Deslongchamps, E., Notes pour servir à la Géologie du Calvados, Caen, 1863. Bull, de la Soc. Linn. de Normandie, vol. vii.Google Scholar

page 269 note 6 The workmen of Ranville give the name of chien to these hard and perforated surfaces, in allusion to the hardness of these bands. Dur comme du chien is a Normandy expression which indicates an extreme degree of compactness.

page 270 note 1 Deslongchamps, ibid. p. 19, pl. 2.

page 270 note 2 Hull, Memoirs, p. 37. Hull, ibid. p. 45.

page 270 note 3 Lycett, The Cotteswold Hills, p. 49.

page 270 note 4 Memoirs of the Geological Survey, 1846, vol. i. p. 289.Google Scholar

page 271 note 1 De la Beche, ibid. p. 291.

page 271 note 2 Hull, Memoir, ibid. p. 72.

page 271 note 3 De la Beche, Memoir, ibid. p. 285.