The End of Trimmgham Chalk Bluff. 



291 



a mass of chalk, but mainly consisted of a rather peculiar gravel, 

 formed of irregularly alternating beds, more or less streaky or 

 lenticular, of pebbles and sand (Fig. 2) ; the latter in one or two places 

 attaining a thickness of 15 or 16 inches, and being fairly free from 

 stones. This and the matrix of the former is a light-coloured quartz- 

 sand, occasionally having more chalky streaks. The fragments of the 

 gravel are mostly chalk and flint. Those of chalk are of two forms, 

 the less numerous being rather well rounded, ranging up to about 

 4 inches in diameter ; but the majority ' tabular ' in shape, with 



^^& 





Fig. 2. Diagram of boulder of chalk and associated gravel in Contorted Drift 

 (with Boulder-clay) near Trimingham. Explanation : 1, Chalk with flint. 

 2, Gravel with sandy beds, bedding nearly vertical. 3, Grey clay. 

 4, Irregularly banded sand and clay ; 4 feet sand. 5, Boulder-clay ; 5 feet. 

 Boulder-clay showing on beach in many places. 6, Ordinary clayey sand 

 of Contorted Drift. 7, Slip. 



corners and edges somewhat worn, the longer diameter being not 

 infrequently about 5 or even 6 inches. These slabs, since the bedding 

 is now vertical, give a marked character to the gravel. The pieces of 

 flint vary from angular to moderately rounded, and any so much as 

 4 inches in diameter are rather uncommon. The embedded boulder of 

 chalk contains two distinct layers of flint, the lower more strongly 

 curved than the upper, with indications, as we think, of a third one 

 nearer to the base.^ This mass and the left-hand part of the gravel 



' The gravel and the attached chalk are to be seen (though, of course, less 

 clearly than now) on Figs. 10, 11, PI. V (Brydone, loc. eit.). These indicate 

 that it must have been a few yards farther from Cromer than the right-hand 

 mass of chalk (that marked E in the Plate illustrating our paper in this Magazine 

 for 1905, Plate XXII), or about north of the east end of E in the plan on p. 401 



