﻿Yol. 64.] ANNIVERSARY ADDRESS OF THE PRESIDENT. IxXXvii 



likewise Mr. F. G. H. Price's contribution on the Gault of 

 Folkestone (1874). More recently we are indebted to Mr. S. S. 

 Buckman for a succession of papers on the Inferior Oolite (Bajocian) 

 and to Mr. L. Eichardson for others on the Rhaetic Beds, Lias, and 

 Inferior Oolite, which supplement the earlier observations of Thomas 

 Wright and Charles Moore. The application of the method of 

 classification by palaeontological zones permits of much greater 

 minuteness of detail than was formerly practicable in the treatment 

 of these strata. 



The Liassic and Cretaceous groups of the North -East of Ireland, 

 first worked out in detail by Ealph Tate, were described by him in 

 papers which appeared in the Quarterly Journal between 1864 and 

 1867, while a more minute study of the Cretaceous rocks of that 

 district was communicated to us in 1897 by Dr. W. Eraser Hume. 

 The Jurassic rocks of Scotland, first noted by Macculloch and after- 

 wards in more detail by Sedgwick and Murchison, began to be brought 

 into closer correlation with their English equivalents in 1851, when 

 Edward Eorbes detected estuarine beds of the age of the Oxford 

 Clay in the north of Skye,^ and when, in 1858, Thomas Wright, from 

 a collection of fossils submitted to him, recognized the presence of 

 Lower and Middle Lias in the district of Southern Skye.^ In later 

 years this work was continued and extended by Bryce and Tate 

 (1873).^ But for the first connected account of the distribution 

 and subdivisions of the whole Secondary Series of Scotland we are 

 indebted to Prof. Judd, whose series of papers on the subject was 

 communicated to the Society between 1873 and 1878.* 



The work of Hebert, who applied to the Chalk of the South-East 

 of England the zonal classification which he had worked out in 

 the x^orth of France, was taken up and extended in this country by 

 our esteemed Foreign Member Prof. Barrois, whose masterly essay, 

 ' Recherches sur le Terrain Crelace Superieur de I'Angleterre & de 

 rirlande,' published in 1876, has influenced all the subsequent 

 investigation of the Cretaceous formations of this country. In 

 recent years we have seen the same zonal principle carried into still 

 further detail by Dr. A. W. Eowe, who, employing among other 

 fossils the species and * group-forms ' of the genus Micraster, has 

 been able to show that the recognized zones of the White Chalk are 

 capable of still more detailed yet serviceable subdivision. His 

 suggestive series of papers have been communicated to the Geologists' 



1 Q. J. vii, 104. 2 Q, j^ xi^^ 24. 



3 Q. J. xxix, 317-51. 4 Q. J. xxix, xxx, xxxiv. 



