546 REV. R. B. WATSON ON THE DRIFT-BEDS IN THE SOUTH OF ARRAN. 



Fig. 7. Shows at the bottom a bed formed under a glacier. To the left it is overlaid by the boulder- 

 clay, which to the right has been eroded, and the glacier-bed here is overlaid by a layer of 

 large stones. (P. 631.) 



Plate XXII. 



Fig. 8. At the bottom, the same glacier-formed bed overlaid to the right by boulder-clay ; to the 

 left, both the glacier-formed bed and that of boulder-clay seem to have been eroded, and 

 a mass of stones and gravel, like that in fig. 7, but thicker, lies on the hard glacier-bed. 

 (P. 532.) 



Fig. 9. Bed, 100 feet high, in Crogcrever Bum-course, just above its junction with the Slaodrigh 

 Burn. (P. 532.) 



Fig. 10. Gorge in Crogcrever Burn, the west side being formed by the rock, the east side by the 

 boulder-clay lying down the dip of the strata. (P. 533.) 



Fig. 1 1 . Bed of hard yellow clayey gravel, lying in behind a barrier of felstone. The bum has 

 partly cut in between the rock and the bed, but in the distance in the fig., has turned to 

 the right, and cut through the bank. (P. 533.) 



Fig. 12. The same bed further up the burn, with overlying beds. (P. 533.) 



1. The hard yellow clayey sand or gravel, with a huge striated greenstone boulder 



sticking in it. This bed is laminated, but not stratified on its upper surface to the 

 left. 



2. Overlying 1. Red boulder-clay, with a large boulder sticking in it, but projecting 



above its surface into 



3. Coarse sand, 10 feet thick in parts. 



4. Very large stones, 3 feet. 



5. Fine light-coloured sand, 6 inches. 



6. Earth. 



Fio-. 13. The same bed still further up the burn, and just below the felstone rock. To the left, in 

 the burn-course, is boulder-clay. Underlying this is the hard yellow clayey gravel here 

 much discoloured, and containing heather stalks. Above this is debris, with boulder-elay 

 showing atop. (P. 534.) 



Fig. 14. Beds in Clachan Glen, 20 feet high. At the bottom is a talus of debris. Above this, to 

 the left, a face of the shale-rock, 2 to 3 feet high. Lying up on this to the right, 2 feet 

 the dense gravel. Overlying this bed, and to the left lying directly on the shales (which 

 have been stripped there of the dense gravel), 3 feet of large stones ; then 2 feet fine sand. 

 Earth atop. (P. 535.) 



Fig. 15. Great banks in Clachan Glen, (P. 535.) 



1. Hard gravelly clay, 15 feet. 



2. Looser stones and gravel, 4 feet. 



3. Dense finely laminated clay Avith fine sand, becoming more sandy towards the top, 



containing twigs, 15 feet, 



4. Dense hard boulder-clay, 8 feet. 



5. Big stones and gravel, 5 feet. 



6. Boulder-clay or drift, 30 to 40 feet. 



