114 MESSES. A. J. JUKES-BROWNE AND W. HILL : [May 1 896, 



The numbers above given correspond with those of the Pinhay 

 section, and the whole is, in fact, an expanded counterpart of that 

 section (see p. 112). The upper surfaces both of 3 and 4 are more 

 clearly marked, while the glauconitic chalk (No. 5), as near Lyme 

 Regis, passes up into the hard rough nodular chalk above, which 

 contains Echinoconus subrotundus. It is a remarkable instance of 

 the rapid changes which take place in these beds that this No. 5 

 should be here 6 feet thick, though at Beer Head, only 400 yards 

 away, it is represented merely by small nests of sand. 



We are able to state that, as a result of revisiting this section in 

 company with one of us, Mr. Meyer no longer maintains his corre- 

 lation of his beds 10, 11, 12 (our zone of Amm. Mantelli) with the 

 Warminster Greensand or with the Chloritic Marl, nor of his 13 

 and 14 with the Chalk Marl. He had in 1874 perceived the clear 

 lines of demarcation which exist at the top of his No. 9 and at the 

 top of No. 12, and he now agrees with us that the beds so limited 

 must represent either the whole or a part of the Lower Chalk. 



It is quite possible that only a part of the Lower Chalk is here repre- 

 sented ; for, whether we take bed 5 of our section to be the zone of 

 Belemnitella plena or the base of the Middle Chalk, there is clearly 

 a break between it and the bed below, so that we may assume that 

 there is nothing to represent that part of the Lower Chalk which 

 lies between the zone of Ammonites varians and that of Belemni- 

 tella plena. 



Whether material was deposited here and afterwards washed 

 away by current-erosion, or whether no deposition took place in the 

 interval, it is at present impossible to say, but for our present 

 purpose it is sufficient that there is here an arenaceous representa- 

 tive of the Chalk Marl containing most of the characteristic fossils 

 of that marl mixed with a number of other species which are 

 evidently shallow-water forms, and these species are, as we shall 

 see, almost all found in the Cenomanian of the Sarthe. 



Confirmation of our reference of these beds to the lower part of 

 the Lower Chalk is found in the neighbourhood of Chard and Chard- 

 stock, the latter place being only 9 miles north of Lyme Regis. 

 The succession here has been accurately given by Mr. H. B. Wood- 

 ward, 1 and so far as the Upper Greensand is concerned it resembles 

 that of the coast-section. The upper surface of the Greensand is a 

 well-marked plane, and upon it rests a hard quartziferous and glau- 

 conitic chalk crowded with fossils ; this passes up into softer 

 glauconitic chalk, which rapidly graduates into chalk with few 

 fossils. Of this white chalk there is probabJy 30 or 40 feet, and 

 there is some thickness of yellowish marl above it, all belonging to 

 the Lower Chalk. 



The basement of this Lower Chalk has been called Chloritic 

 Marl, and it has long been celebrated for the abundance and good 

 preservation of its fossils. The assemblage, however, is rather that 

 of the whole Chalk Marl than that of the Chloritic Marl of the Isle 

 of Wight, and it also includes some of the rare and peculiar species 

 1 ' Geology of England and Wales,' 2nd ed. 1887, p. 392. 



