Vol. 69.] TWO DEEP BOEINGS AT CALVERT STATION". 337 



Deadstock area one or other of the lowest Charmouthian zones rest 

 •upon the obtusum or seftiicostatum zone of the Sinemurian. 



(2) A later Charmouthian overlap (hemera cajpricorni) occurs 

 at Dover. 



(3) At Calvert and Oxford, and (if my interpretation be correct) 

 at Bletchley, there is evidence of a post-Charmouthian emergence, 

 causing the very marked non-sequence between at least a high 

 .zone of the Vesulian and the ]owest zone of the Domerian. It 

 would be interesting to know in what manner this gap gradually 

 becomes filled up between Calvert and the outcrop in the Banbury 

 district. Future borings may perhaps add much to our knowledge, 

 and enable us to date with some precision alternate advances and 

 withdrawals of the sea over this area. For the present, we only 

 know that the non-sequence is split into two: for, whilo at 

 Fritwell the Trigonia-signata Beds rest on Upper Liassic Clay with 

 Daetijlioceras, 1 at Brackley the Upper Lias rests directly on the 

 margaritatus zone. 2 This disappearance of the sjoinatum zone 

 (which I suspect also at Stratton Audley and Stony Stratford 

 from the published accounts 3 ) is remarkable, in view of the fact 

 that at Mells in Somerset the spiuatum zone appears to overlap on 

 to the Palaeozoic. 4 When emergence in one area is thus contem- 

 poraneous with submergence in another, it is evident that broad 

 movements of the sea-level cannot alone explain the facts : local 

 crust-movements must have been taking place. 



(I) The repeated oscillations that produced the numerous non- 

 sequences in the Inferior Oolite do not appear to have left any 

 trace in the East of England. Even the garanliana overlap, which 

 is so widespread in the West of England and touches the Palaeozoic 

 at ]N~unney, did not reach as far east as Calvert. It was not until 

 late in the Vesulian age that the area of deposition once more 

 extended to that point : it may have reached Brabourne at about 

 the same time. In neither place does it attain the Palaeozoic floor 

 itself: Vesulian rests upon Toarcian at Brabourne, upon Domerian 

 at Calvert. 



(5) The Bathonian overlap {circa hemera bathonicce) upon the 

 Palaeozoic floor is known under London (at Meux's Brewery), and 

 at Bichmond and Streatham. It may have been about the same 

 time, or somewhat later, that Charmouthian beds were re-sub- 

 merged at Bletchley. At Dover the date was probably earlier. 



(6) The Callovian overlap (hemera macrocejthcdi), which is of 

 so much importance abroad, is unknown in England, if the old 



1 I am indebted to Mi - . J. Pringle for this information. 



2 I am indebted to Mr. E. A. Walford for this information in advance of 

 publication. 



3 H. B. Woodward, 'Jurassic Rocks of Britain' Mem. Geol. Surv. vol. iv 

 (1894) pp. 391, 493. 



4 G. Moore, Q. J. Or. S. vol. xxiii (1807; pp. 580-81. 



