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VII.—On the Use of the Term Neocomian

Published online by Cambridge University Press:  01 May 2009

John W. Judd
John W. Judd
Affiliation:
Geological Survey of England and Wales.
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Extract

The confusion which has of late years resulted from the multiplication of names for the same geological stratum, formation, or system, sufficiently indicates the necessity for the adoption of certain rules by which our geological nomenclature may be reformed and brought into a state of something like uniformity. When this necessity is acknowledged, but little doubt can arise as to the principles on which such rules must be based; the law of priority, with certain necessary limitations and exceptions, will be made to govern the terminology of Geology, as it already does that of almost every other Natural Science.

Type
Original Articles
Information
Geological Magazine , Volume 7 , Issue 71 , May 1870 , pp. 220 - 227
Copyright
Copyright © Cambridge University Press 1870

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References

page 223 note 1 Annals of Philosophy (new series), vol. viii., p. 458.

page 223 note 2 The term Lower Greensand originated in a mistaken notion that the beds; above and below the Gault had intimate relations with one another, and that they might therefore be made to constitute a single formation, “the Greensand,” of which the Gault was to be considered the middle, and a subordinate member. The inapplicability of the name, even in the typical districts of Kent and the Isle of Wight, has frequently been pointed out. The misapprehension which must arise from the use of parallel terms for a subordinate bed (seldom more than 100 feet thick) and a great formation (nearly 1,000 feet thick) is evident. To give this bad name, “Lower Greensand,” an extended meaning, by applying it to the Speeton Clays of the North of England, or to the great variety of beds of the same age on the Continent, would make matters infinitely worse.

page 224 note 1 Trans. Geol. Soc, second series, vol. ii., p. 97.

page 224 note 2 Proc. Geol. Soc, vol. i., p. 19.

page 224 note 3 Annals of Philosophy, new series, vol. viii. (1824), p. 461.

page 224 note 4 Trans. Geol. Soc., 2nd series, vol. iv., p. 103.

page 224 note 5 Quart. Journal Geol. Soc. vol. i., p. 189.

page 224 note 6 See, especially, “On the Geology of the South-east of Surrey.” Proc. Geol. Soc. iv., p. 167, 196; and “On the Age and Position of the Fossiliferous Sands and Gravels of Farringdon,” Quart. Journal Geol. Soc, vol. vi., p. 454.

page 226 note 1 On this subject I would refer the reader to Mr. Davidson's valuable “Notes on Continental Geology,” in the Geological Magazine for 1869.