ADAMSON: THE YORKSHIRE BOULDER COMMITTEE. 



507 



SPECIMENS OF ERRATIC BOULDERS FOUND ON THE 

 DRAINAGE AREAS OF THE OLDHAM CORPORATION WATER- 

 WORKS (BORDERS OF YORKSHIRE AND LANCASHIRE). 



No. 



1. 

 2. 



3- 

 4- 



5- 

 6. 



7- 

 8. 



9- 

 10. 

 11. 

 12. 



i3- 

 14. 



IS- 



16. 



17- 

 18. 



19- 

 20. 

 21. 



23- 

 24. 



25. 

 26. 



27- 



28. 

 29. 



32. 



33- 

 34- 

 35- 

 36. 

 37- 

 38. 

 39- 



SPECIES OF BOULDERS. 



Micaceous Granite — two Micas. (Criffel, South of Scotland.) 



Coarse-grained Granite. (Eskdale, Cumberland.) 



Gryphsea incurva — Lias (found at Piethorn). 



Syenite. 



Quartz rock. 



Medium-grained Syenite — Mica Syenite. 



Schist tilled with segregated Quartz. 



Hornblendic rock. Diorite. 



Purple, iron-stained, siliceous breccia. (Borrowdale. ) 



Syenitic quartz — felsite. (Lake district.) 



Porphyritic augite — andesite — Dacite. 



Altered, fine-grained, micaceous Granite — Mica or hornblende, altered. 



Fine-grained Granite. (Probably Lake). 



Augitic basic igneous rock — altered. (Borrowdale.) 



Porphyritic andesite. 



Quartz — felsite. (Lake district.) 



Permian nodule (containing Schizodus). 



Fine-grained Syenite. (Buttermere.) 



Siliceous rock — ferruginous. (Borrowdale.) 



Siliceous Hornstone — Rhyolitic Series. (Coniston.) 



Fine-grained porphyritic Andesite. (Borrowdale.) 



Fine-grained greywacke. 



Altered carboniferous shale — Ferruginous. 



Quartz — felsite. Hornblendic. 



Crushed igneous rock. Serpentinous. 



Compact felstone. Slightly porphyritic. 



Volcanic conglomerate. 



Syenite from Ennerdale. 



Ennerdale Granite, passing into Greenstone. 



Upper Silurian Grit. 



Lower Silurian Grit. 



Felstone. 



Passage rock between Syenite and Greenstone. 



Greenstone of the Lake district. 



Fine sedimentary Limestone. 



Porous Trap. 



Bunter Sandstone. Pebble beds. 



Ganister nodule. Polished. 



Iron ore. 



Note.— With the exception of 3, 5, and 17, the first 25 specimens are 

 those named by Prof. Lapworth. The others have been named by 

 D. Mackintosh, F.G.S., W. Shone, F.G.S., and myself. 



Oct. 1S89. 



