f 



MINERALOGICAL QUERIES. 121 



hills belong to the newest floetz-strap forma- 

 tion * ? 



35. What are the particular species of petri- 

 factions that occur in the transition-lime- 

 stone, near the Crook, on the road from 

 Edinburgh to Moffat ? 



36. Does not the hill on which the town of 

 Stirling is built, belong to the oldest coal-* 

 formation ? 



37. What are the geognostic characters and re- 

 lations of the veins that traverse, or are in- 

 cluded in, the greenstone of the independent 

 coal- formation ? 



38. Are the trap veins that traverse the mining 

 field at Strontian, basalt, greenstone, or por- 

 phyry-slate ; or do all these species of rock 

 occur in that district ? 



39. Are the leadglance veins of Strontian si- 

 tuated in sienite ; and what are their other 

 geognostic relations ? 



40. Does the quartz-rock of Scuraben and Mor- 

 ven in Caithness, and of Portsoy in BanfF- 



* This Cheviot pitchstone was first observed by my 

 friend Mr Murray, Lecturer on Chemistry, 



