The Jurassic system in Great Britain by Arkell W.J.

By Arkell W.J.

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S. , vol. Ixx, pp. 259 et seq. 4 K. Mayer-Eymar, 1881, Classification 0 internationalc, c Z u r i c h , 4 ; also 1884 'Die Filation der Belemnites acuti. Vierteljahrsschrift der Ziircher Xaturforsch. Gescllsch. , 1917, vol. lxxiii, p. 283); and repeated in 1888, Tabl. des Terrains, Zurich 40. IO CLASSIFICATION AND CHRONOLOGY Radstock district and South Wales, by Buckman and Mr. L . Richardson in the Inferior Oolite from Dorset to the Cotswolds, and by the late Dr. Lee in the Hebrides, led to so great an elaboration of the hemeral table that many lost patience with Jurassic chronology, and the principles on which it is based are frequently discredited.

Pictonian might be better; but if the Pictonia zone be regarded as belonging to the Rasenian, then Prionodoceratan is redundant. 36 — the hemerae of Aulacostephanus yo and A. pseudomutabilis. 37. , vol. iv, 1922, pp. 6-13). 38-40. T h e positions of these are according to Neaverson, 1928, Strat. , pp. 373-6. As will be explained on pp. 465-6, Buckman misunderstood the stratigraphy of the Upper Kimeridge Clay. Pavlovian Holcosphinctean of Neaverson and Buckman (Holcosphinctes being synonymous with Pavloiia ; see p.

3 C. Diener, 1918, Neues Jahrb. , Beilage Bd. xlii, p. 91; and 1925 Grundziige der Biostratigraphie, Vienna and Leipzig, pp. 217-18. 4 A. E. , vol. xxxiv, p. 20c. 5 S. S. Buckman, 1902, loc. , pp. 556-7. 1 2 IO CLASSIFICATION AND CHRONOLOGY have the biozone of a species, of a genus, of a family, or of a larger group. The biozone of Ammonites would be equal to Mesozoic time; . . ' T h e distinction between the biozone of a given species and its hemera may be expressed as the difference between its absolute duration (as indicated by its total range) and its acme; but since in practice neither can be very accurately defined, owing to the imperfections of our collecting ('collection-failure'), the two units become virtually synonymous.

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