part 1] JURASSIC CHRONOLOGY: lias. 101 



For the geographical distribution of the faunas of the various 

 dates reference may be made to my former paper 1 ; but some 

 supplementary information of this kind is appended in certain 

 special cases. The numbers in parentheses refer to the positions 

 given in Table I of this paper (facing p. 70). Words in brackets 

 followed by such numbers are interpretations of Mr. Richardson's 

 finds ; but, without such numbers, they have reference to faunas 

 not mentioned by Mr. Richardson. 



(12) The evidence considered in this paper seems to support still 

 further the fragmentary character of the geological record noticed 

 by Dr. J. W. Evans in the discussion on my former paper. His 

 surmise of non-sequences without paheontological evidence is 

 correct : such are known in the Oolites, and will come for notice 

 in the continuation of these studies. Such chronological studies, 

 providing a method of recording not only non-sequences but the 

 maxima of deposit (work performed) in stated times, have, when 

 made with precision, much bearing on the question of the duration 

 of geological time — a subject of general interest. 



(13) A palseontological paper should accompany this one ; but 

 to attempt it now would mean a very long delay — one out of all 

 proportion to its value. And meanwhile there are more important 

 stratigraphical papers to be attempted : certain preparatory studies 

 for work on the correlation of the Oolites. 



VI. Bibliography. 



I. 1. Buckman, J. 'Geology of Cheltenham ' hy R. I. Murchison, new ed. 

 by H. Strickland & J. Buckman, 1844. 

 II. 1. Buckman, S. S. ' The Relations of Dundry with the Dorset- Somerset 

 & Cotteswold Areas' Proc. Cotteswold Nat. Field Club, vol. ix 

 (1889) pp. 374-87. 



2. Do. ' Palaeontologia Universalis ' 1904, 1905. 



3. Do. ' Lias Ammonites ; ScMotheimia ' Proc. Cotteswold Nat. P. C. 



vol. xv (1906) pp. 231-52, pis. x & xi. 



4. Do. ' Yorkshire Type Ammonites' vols, i & ii, 1909-19. 



5. Do. 'Genera of Jurassic Braehiopoda' 1914, pp. 2. 



6. Do. 'A Pala?ontological Classification of the Jurassic Rocks of the 



Whitby District ' chapt. v in 'The Geology of the Country between 

 Whitby & Scarborough ' Mem. Geol. Surv. 2nd ed. 1915. 



7. Do. 'The Braehiopoda of the Namyau Beds of the Northern Shan 



States, Burma' Palseontologia Indica, n. s. vol. iii, Mem. 2, 1917. 



8. Do. 'Jurassic Chronology: I, Lias ' Q. J.G.S. vol. lxxiii (1917-18) 

 pp. 257-325 & pis. xxvi-xxxi. 



Do. 'Type Ammonites' vol. iii, 1919-20. 



Buckman, S. S. & Wilson, E. ' The Upper Portion of Dundry Hill ' 



Q. J. G.S. vol. Hi (1896) pp. 669-720. 

 d'Orbigny, A. ' Paleontologie fran caise ' Terrains Jurassiques I: 



Cephalopodes, 1842-1851. 

 De Riaz, A. 'Ammonites des Couches h Pelt oe eras transversarium 



aTrept (I sere)' 1898. 

 Dumortier, E. ' Bassin du Rhone ' vol. ii, 1867. 

 Fucini, A. ' Fauna del Lias Medio di Monte Calvi ' Pala3ontographia 



[talica, vol. ii (1896) pp. 203-50, pis. xxiv & xxv. 

 VIII. 1. Gever, G. 'Cephalopodcn-Fauna von Hierlatz ' Abhandl. K.-K. Geol. 



Reichsanst. vol. xii, pt, 4 (1886) pp. 213-86. 



III. 



9. 

 1. 



IV. 



1. 



V. 



1. 



VI. 

 VII. 



1. 



1. 



1 II, 8, pp. 276, 277. 



