Prof. T. G. Bonney—The Chalk Bluff at Trimingham. 403 



chalk. The latter rock formed the seaward pier, and the curved 

 bands of flints were distinctly visible on its more western and more 

 eastern faces. On the former we saw, above the uppermost of these 

 bands, a fairly distinct gritty streak (/), which was approximately on 

 the level of the top of the 'arch' and was prolonged for some 

 distance landwards. A mass of boulder-clay formed the landward 

 pier, changing, in the right spandril of the arch, into a marly chalk. 

 This was interrupted near the middle by a streak (</), averaging about 

 two inches in thickness, which contained flint pebbles and looked 

 like the ' washings ' of boulder-clay. The eastern side of the ' arcli ' 

 showed the masses of chalk and boulder-clay (the latter exhibiting 

 stratification at a high angle), the rubbly grey chalk described by 

 Mr. Brydone, and the two streaks just mentioned, the upper one 



b. 

 c. 

 d. 

 e. 



/• 

 9- 



Fig. 2. — Remnant of Bluff near Trimingham, sketched from the Cromer side, 

 April 18, 1906. 

 a. Chalk with flints. 



Marly-looking chalk with some flints (probably remanie) . 



Boulder-clay. 



Boulder-clay showing stratification. 



Gravel, greatest thickness about 1 foot ; little patches of it remain here and 



there to the right. 

 Gritty streak, generally distinct. 



Streak, from 2 to 2^ inches thick, of clay with flint pebbles, looking like 

 rearranged boulder-clay. 

 h. Marly chalk. 



being apparently more marly at the seaward end and more gravelly 

 at the other, and the lower one a gravel. Overlying the grey chalk 

 (near the former end) was a patch of coarse gravel — perhaps a foot 

 thick — remnants of which could be detected on the landward side. 

 On the upper part of the sloping face of the second mass (C) we 

 failed to discover any traces of the gritty or gravelly seam ^ between 

 the grey and the white chalk (that containing Ostrea lunata), but 

 a thin seam of fine gravel could be detected at the foot of the slope 

 apparently overlain by the chalk (both grey and white) and over- 

 lying boulder-clay, a mass of which formed a kind of abutment, 



^ We attach no particular importance to its absence and do not dispute 

 Mr. Brydoue's observation. 



