1859.] HULL THINNING-OCT OF THE SECONDARY ROCKS. Go 



Fig. 5. Under view of the same skull. [All the figures are of the natural size : 

 the original is in Ihe British Museum ; the letters and figures are ex- 

 plained in the text.] 



PLATE III. 

 Fig. 1. Side view of the fore end of the skull of Cynochampsa laniarius. 

 Fig. 2. Front view of the same. 

 Fig. 3. Upper view of the same. 

 Fig. 4. Under view of the same, showing the bodies and pulp-cavities of the 



fractured upper and lower canines, nat. size. [Original in the British 



Museum.] 

 Fig. 5. Under view of part of the skull, with the hyoidean arch and appendages, 



of Oudenoclon, nat. size. [The original is in the British Museum ; the 



letters and figures are explained in the text.] 



2. On the South-easterly Attenuation - of the Lower Secondary 

 Formations of England ; and the probable Depth of the Coal- 

 measures under Oxfordshire and Northamptonshire. 



By Edward Hull, Esq., A.B., F.G.S., of the Geological Survey of 

 Great Britain. 



[Plate IV.] 



Com : 



§ 1. Introductory remarks on Mr. R. Godwin-Austen's theory, and on the 

 Formations of the Franco-Belgian Coal-field. 



§ 2. Distribution of the Lower Permian Eocks of Central England. 



A. Shore of the Lower Permian basin. 

 § 3. South-easterly Attenuation of the Lower Secondary Rocks: — 



1. The Trias. 



A. Bunter Sandstone. 



B. Lower Keuper Sandstone. 



C. Red Marl. 



2. Claims of the Trias to more consideration from G 



3. The Lias ; connexion of its three members, and their range and limit. 



A. Lower Lias. 



B. Marls! 



('. Upper Lias. 



1. The [nfcrior Oolite ; its attenuation. 

 . r >. The Fuller's Karth. 



6. The Great Oolite ; ite Lower ami L'jijht Zones, ami their comparative 

 range. 



§4. Extension of the Coal-measures under Oxfordshire ami Northampton- 

 shire, from Warwickshire to the Valley of the Thame-. 

 § 5. Physical Geography of the Trias, 



A. Evidence of land in the North Atlantic ana daring the Newer 



Palaeozoic and Older Si oondary Periods. 



B. SubaeriaJ conditions in the British area during the formation 



of the ICuschelkatt of Germany. 



C. Unconformity of the Bunter ana Keuper Formations. 

 />. Causes of Variations in the Peraistencj of Strata. 



!j il. Probable South-easterlj Attenuation of the Carboniferous Beri 

 § 7. General I kmolusions. 



§ 1. Introduction. The presenl is. perhaps, :■ ti 1 1 i n ir occasion Foj 

 submitting to the notice of the Society the follow ing j.i, as regarding 

 tin- extension of the Lower Secondary Rocks in the direction ol 



