736 J. W. JUDD ON THE SECONDARY EOCK8 OF SCOTLAND. 



Miocene Basalts. ft. in. 



§ fl - ( (a) Thin seam of grey marl 1 



'C'^ \ (b) Black carbonaceous and micaceous sand 3 



a ^ J (c) Brown micaceous sand, passing down into white and 

 & ^ { grey sand of a coarse character. Many carbonaceous 



sh m - markings 3 



g<-£ | (d) Whitish grey marl with plant-remains 1 



p « [(e) Laminated grey marl with seam of impure lignite 2 



m |" (/) Band of weathered chalk-flints 1 



l! "l (#0 White highly-siliceous chalk (only imperfectly exposed 



O L here) 3 0? 



S J f (A) Sands (not well seen) 10 0? 



o «3 "I (0 Coarse white sands, becoming greenish and glauconitic 



h?3 atthebase 20 to 30 



<e 





f (&) Calcareous greensand with shells 6 



(I) Greensand with fossils 1 



(m) Dark green glauconitic sands crowded with shells 3 



(n) Calcareous greensand with several bands of shells 6 



(o) Glauconitic sands crowded with fossils 1 6 



(p) Greenish grey sand with many quartz-pebbles and much 



glauconite in its lower part 6 



(q) Grey sand, greenish and glauconitic in places 10 



(r) Hard calcareous band with a few fossils 6 in. to 1 



(s) Grey glauconitic sand 5 



(^) Beds of indurated greensand with only a few fossils ... 10 

 (Very strong springs arise at the base of this last bed.) 



An abstract of the section at this point gives the following as 

 the thicknesses of the several formations : — 



(1) Upper estuarine strata 4 ft. 6 in. 



(2) Upper Chalk (marine) 3 to 4 ft. 



(3) Lower estnarine strata 35 ft. ? 



(4) Upper Greensand 44 ft. 



The Lower Lias and Poikilitic, which lie below the Cretaceous 

 strata here, have probably a united thickness of about 50 feet. 



The only locality, besides the outliers already described, in which 

 I have found any traces of the Upper series of estuarine strata form- 

 ing the top of the Cretaceous series is in a little glen to the south- 

 east of Ardtornish Towers, which, from the fact that some two tons 

 of impure lignite were once obtained from it, is known as " the Coal 

 Glen." The section here is unfortunately very obscure indeed ; and 

 I could only determine the fact that the lignite-beds in question lie 

 between the Miocene basalts and tuffs above, and red sands, clays, 

 and concretionary limestones of the Poikilitic series below. It is 

 possible, however, that if a more complete section were obtainable, 

 the succession of strata would be found similar to that seen in 

 Beinn-y-Hattan. The age of this upper series of estuarine beds 

 must still be regarded as doubtful. Prom their apparent close con- 

 nexion with the strata below, I am inclined to consider them as 

 Cretaceous, and as representing beds younger than any part of the 

 Chalk of the British islands : but it is quite possible that they may 



