Reviews—Geology of Whitby and Scarborough. 423 
REVIEWS. 
———._— 
I.—Tur Gronosy or rue Country serween Wuirsy anp Scar- 
BoroueH. Second edition. Memoirs of the Geological Survey, 
1915. 8vo; pp.iv+144. London: E. Stanford, Long Acre. 
(J\HE second edition of this memoir has been prepared to accompany 
the new colour-printed map of the district ; it has been brought 
up to date and considerably enlarged, two of the new features being 
chapters on the paleontological classification of the local Jurassic rocks 
by Mr. S. S. Buckman and on the fossil plants of the Lower Oolites. 
The scope of the memoir has also been slightly enlarged by the 
inclusion of a small triangular area around the town of Whitby, 
hitherto comprised in the Cleveland memoir. 
The geology of this district possesses many features of interest and 
‘includes problems which cannot yet be regarded as solved. Two 
questions, however, stand out before all others in importance, namely, 
(a) the origin and stratigraphical relations of the Blea Wyke beds 
and (6) the glacial phenomena of the district. 
With regard to the Blea Wyke beds, recent work by Mr. Buckman, 
Mr. L. Richardson, and others has shown that the thickness of the 
strata found at Blea Wyke, but absent elsewhere in North-East 
Yorkshire, is even greater than was formerly supposed, amounting 
perhaps to as much as 200 feet. According to the zonal evidence 
there is probably a non-sequence below the Werinea bed, which is 
regarded as the base of the Aalenian, while the Blea Wyke beds proper 
and Sétriatulus shales are Yeovilian. As is well known, elsewhere 
the base of the Dogger rests directly on the Upper Lias (Whitbian), 
the Yeovilian being absent. . With regard to the suggestion that the 
presence of these strata at Blea Wyke only is due to the shelter 
afforded by the existence at that time of a submarine fault-scarp at 
Peak, the treatment in this memoir is not satisfactory. The sections 
devoted to the discussion of this point read like a mosaic of two 
statements written from opposite points of view. On p. 82 we read, 
“‘the suggestion . . . involves many impracticable suppositions. 
Moreover, the facts to be explained do not arise from the thickening 
of beds, but from the presence of additional beds not found elsewhere 
in the neighbourhood.”’ The latter sentence shows a total misunder- 
standing of the ideas of Mr. Hudleston and others. The supposition 
of the inter-Jurassic age of the Peak fault was put forward to explain 
precisely this point, namely, the presence of additional beds, and had 
nothing to do with variations in the thickness of beds which exist 
elsewhere. However, at the bottom of the same page the writer of 
the memoir goes on to accept wholeheartedly the theory which he 
has just stated to be impracticable. It is shown that in Jurassic 
times there must have been a fault somewhat along the line of the 
Peak fault, with a throw of 200 feet. This is a higher figure than 
was claimed by earlier writers. 
Mr. Buckman’s work on the Ammonite zones has revealed many 
points of interest in the correlation of the various members of the 
Jurassic rocks above the Dogger. It is clear, for example, that the 
