266 



tact with, and adhering to, protrusions of greenstone. The part not 

 hardened has been washed away. It would not probably be known here, 

 being so like the greenstone in aspect, only for the Ammonites and other 

 lias fossils which it contains.* 



Geeensajjd. 



The Green sand of Antrim, like the chalk, is thin, compared with 

 the English equivalent. It is well known to the men who quarry 

 the white limestone, for, when they go down to it, they stop, and go no 

 deeper ; they call it " mulatto." It is not used for economical purposes, 

 except a little, as freestone for scouring furniture, by the country people, 

 or sometimes as sand for mortar. In the stream at Collin "Well quarry, 

 it is about 35 feet in thickness, and if there be any lias here, it must 

 be only a few feet, for the red marls are visible a few feet below this 

 rock. The clearest section is at the White rock quarry, two miles west 

 of Belfast, 



There, at the base of the chalk is Greensand, 10 feet thick. 

 Hard brownish white sandstone in beds, . 10 feet. 

 Greensand, 10 feet. 



Total, . . . .30 



Below this everything is covered up with drift. 

 • Woodbum river, two miles west of Carrickfergus, affords a good 

 section, and is a good place for getting the fossils. 



At White Head there is a bench of greensand stripped about 50 feet 

 long, and six feet high clearly exposed. There is more below this, but 

 it is concealed by a talus of loose materials. It is visible here in four 

 or five places, but no good place occurs to measure the whole. Near 

 Waterloo House, a mile north-east of Larne, a pretty good section of it 

 is on the shore. At Glenarm it is not visible ; for where it enters the 

 sea, the shore is in such a state, covered by knolls of chalk that tumbled 

 down from the outcrop of that rock, that it is not visible ; nor is there 

 any other good section of it seen, that I know, for miles from this place 

 to Aultmore river, two miles south-west of Cushendall, where it is only 

 eight inches thick. 



The lias (except at Larne) is generally very insignificant in thick- 

 ness, and the greensand still more so ; in fact they occupy so little 

 horizontal space, that unless exaggerated, they would not appear upon 

 the map at all. Their position is known, of course, by the outcrop of 

 the chalk, which accompanies them at the surface everywhere. 



* See Dr. Richardson's paper on this Rock in the " Transactions of the Royal Irish 

 Academy," vol.ix., p. 22 ; and the Discussion between Sir R. Griffith and Mr. Bryce, 

 in 1835, "Journal of the Dublin Geological Society," vol.i., p. 166. 



