ALS REPORT—1899. 
newer than that in the lower part of the section containing the marine 
shells, and may possibly be merely hill-wash. 
13. Base of the Drifts and Nature of Underlying Rock Surface 
(Photographs 7, 8).—The surface of the slate is seen in contact with the 
sandy group only, the boulder clay not reposing directly upon the rock in 
any part of the section. The surface of the slates is exceedingly shattered, 
the shattering affecting them to the depth of afoot or two. The shattered 
edges are, with (0, p. 419) certain local exceptions, bent over in an E.S.E. 
direction, 7.e. to the left of an observer looking along the strike of the 
cleavage to the 8.8.W., the displaced laminz retaining generally their 
original direction of strike. The displacement usually goes down to the 
first horizontal joint below the surface, and is a ‘displacement’ rather 
than a true curvature. 
These terminally disturbed slates pass up into a band of siate breccia 
or rubble, composed of angular fragments (ec, p. 419). This forms a well- 
marked band all along the section, and is from 1 to 3 ft. thick, The 
Fic. 4,—N.W. Termination of-Boulder Clay in Section. 
fragments become smaller towards the top, and have at first a slight 
inclination upwards to the E.S.E., the upper layers, however, becoming 
horizontal. Where not obscured by slipping, the junction with the sandy 
drift above is usually well marked, but angular and subangular débris is 
mixed with the lowest layers of the gravel. 
Conclusion.—The above description is not intended to be exhaustive, 
though the description of the section about to be destroyed has been made 
as full as seemed possible at the time. Incidentally certain details in 
other parts of the quarries were observed, and have therefore been included ; 
but these form only a subsidiary and unessential portion of the report, and 
are therefore placed in a separate appendix (see Appendix C), because the 
sections in which they are displayed are in no danger of destruction. 
Generally, moreover, it will be observed that the report is confined to 
questions of structure, physical relations, and measurements ; and that 
many matters of the highest importance, such as species, distribution, and 
state of preservation of the shells, the nature of the boulders in the sands 
and the clay, the character of the fine material of the drifts, are not dealt 
