moEx. 



^80 



PAGE 



Londonderry, Primitive mountain chain of, described . . 125 



Lyas limestone, in the North of Ireland, described . . IS'O 



fo' million, in the North of Ireland, described . . 1C4 



' of the South Western part of Somersetshire, described . 367 



its junction with the red sandstone in Somersetshire . 374 



its most western point in England is East Lynch . . 379 



Lydian stone, found at Duntiilm in Sky .... 98 



Mac Culloch, John, M.D. Sketch of the Mineralogy of Sky 1 



A Geological Description of Glen 



Tik 259 



Magnet, Various rocks in Glen Tilt affecting the . . 324 



Mai'ble, at Strath in Sky, described . . . . 101 



Observations on various sorts of StatuaTy . . 104 



of Sky varying in hardness from the Trap veins tra- 

 versing it ....... • 110 



of Glen Tilt, described 2&2 



Mark, Remarkable bed of, in the Green Sandstone of London- 

 derry ......... 168 



containing land shells in Glen Tilt . . . 316 



Mesotype, found in various states in Sky . « . . 86 

 Mica slhte, one of the oldest rocks in Sky .... 28 

 and Quartz rock generally alternating . . 28^ 



its situation in Sky ...... 28- 



■ found passing into Clay slate. Talc slate, and Chlorite 



slate, in Sky ....... 29 



— contact with other stratified rocks at Loch Eishort 31 



Numerous Trap veins in, in Sky . . . 30 



very generally distributed over the North of Ireland 136 



Mourne Mountains, in Ireland, described . . 122—134 



Midattoe, the name given in Ireland to the Green sand . 130 



Murlocli Bay, on the Coast of Antrim, described ^ . 203 



Nomenclature. Dr. Mac Culloch's Observations on that of 



certain rocks ......... 335 



