THE GEOLOGY OF THE ENGLISH CHANNEL. 149 



M. 29d. 



Much like last, but has a greenish tinge. 



M. 29e. 



Like last, but harder and greener. 



M. 29f. 



Like last, but considerably softer, and greener still with patches of 

 bright decided colour. Micaceous. 



M. 29g. 



Green marl and drab-brown marl as above in narrow alternate 

 bands. 



M. 29h. 



A layer of coarse grey marl and one of fine-grained drab-brown marl. 



The series M. 29a. to M. 291i. inclusive indicates a locality occupied 

 by soft marls of varying texture and colour, associated in one and the 

 same formation in layers of varying thickness, the alternations being 

 frequent and repeated. 



RHAETIC AND LIAS. 



LIMESTONE AND SHALE. 



Most of these limestones contain argillaceous matter; some, how- 

 ever, appear to resemble the White Lias ; in the absence of field work 

 it is not well to attempt to do other than group Rhaetic and Liassic 

 together. 



OFF LYME REGIS— Mi situ. 



This type rock is frequently dredged off Lyme Eegis.' The speci- 

 men shows coral fragments, including Gonioseris. For the rest it is 

 a rough, somewhat sandy limestone, inclined toward a marl. A great 

 deal of brown and black matter occurs in granular form. Obviously a 

 Lias Limestone. 



M. 12a. S. 26° W. Edd., 17 8 miles. 



Drab-coloured stone, fine in grain. The section shows crystalline 

 granular structure with no visible organisms. 



M. 30a. S. 21° W. Edd., 21 5 miles. 



Darkish limestone, rather brown than bufr'. Minutely crystalline 

 granular. Traces of organisms ; grains and slight micro-dendritic 

 growths of iron oxide. 



M. 53a. S. 22° W. Edd., 32 2 miles. 



. A light brown slabby rock, bored by molluscs. A closely-cleaved, 

 highly-calcareous shale. Corresponds to the " paper shales." Dis- 

 tinctly marly. The section shows occasional aggregates of crystalline 

 calcite. The chief part of the rock is a minutely granular pale brown 



