170 Conglomerates underlying the Carboniferous Limestone. 



the stream for about 300 yards, when they are overlain by 

 green conglomerate dipping 7° N. 30° E, The pebbles which 

 make up this conglomerate are of a green shaly sandstone, 

 nearly always flat with rounded edges, not very hard and or 

 the average about the size of a penny. Quartz pebbles are 

 also present and a few intcrstratified sandy layers. This 

 conglomerate is altogether different from the green conglomer- 

 ates mentioned in Micklegill Beck and Chapel Beck above. It 

 neither contains the variet}^ of pebbles that they do, nor are 

 its pebbles of the same shape or as compact. As it appears to 

 be wholly composed of pebbles of the same kind of material 

 it would seem to be of very local derivation. This green 

 conglomerate forms the bed of the stream up to and about 

 600 yards above Beckside, when it is overlain by light greenish 

 sandstones and a light coloured sandstone containing curious 

 black spots. The dip here was noted as 10° N.E. A short 

 distance higher up, and about 400 yards below Scoutgreen, 

 thesis sandstones are again overlain by red sandstones, well 

 exposed a little higher ud in the sides 01 the stream and dipping 

 8° N. 20° E. Above Scoutgreen these red sandstones give 

 place to some lighter coloured and purplish shaly sandstones 

 which are well exposed in the bank opposite Scoutgreen, and 

 which were distinct from and underlying the red sandstones 

 just mentioned. These continue lor some distance up Birk 

 Beck. So far as the exposures in Birk Beck seem to suggest 

 three distinct sets of deposits- a red conglomerate, overlain 

 by a series of green sandstones and conglomerate, again over- 

 lain by red sandstones, the latter agreeing with those on the 

 lower portions of Micklegill Beck, Blind Beck and the Lime. 



Fortunately several becks, giving sections, flow into Birk 

 Beck from the west, and these throw some light on the dis- 

 tribution of deposits in this area. The most important is 

 Siakelev Brck, entering Birk Beck 300 yards above Scoutgreen. 

 At the bottom of this, and in the bed of the stream, the green 

 conglomerate occurring in Birk Beck is exposed, and is directly 

 overlain by red to purple shaly micaceous sandstones forming 

 the sides of the stream. These sandstones contain occasional 

 green shale pebbles from the underlying green conglomerate. 

 Higher up Stakeley Beck a series of red sandstones and con- 

 glomerates comes in, and 500 yards from its junction with 

 "Birk Beck the Silurian rocks are exposed, making a gorge in 

 the stream. 



The small stream, JJoJIin Gill, whicb flows into Stakeley 

 Beck, gives some useful information. At the very bottom of 

 the beck red shale and conglomerate is exposed, but a short 

 wa\^ upstream is green conglomerate similar to that in Birk 

 Beck, and enclosing a few sandy bands. This continues for 

 about 500 yards upstream, when it gives place to a fairl}' coarse 



Naturalist 



