Mr. Tate on Basaltic Rocks. 



203 



North Farm. Midway in this interval there is a great fault, 

 by which the strata on the south side of it are upcast about 

 one thousand feet ; and possibly this fault may, in some way 

 or other, be connected with the absence of basalt from this 

 space ; or it may be that the Basaltic Sill may range from 

 the Fame, under the sea, and curve inland near to Newton ; 

 but though its mineral characters and mode of occurrence are 

 the same as at the Fame, Bamburgh, and in the north, yet. 

 its position here is higher in the Mountain Limestone series. 

 It is thirty feet in thickness, and extends along the coast 

 southwards about a furlong and a half, and at each extremity 

 it is overlaid by the Ebb's Nook or Ten Yard Limestone, one 

 of the upper beds of the calcareous group* ; the limestone 

 dips at the north end W.N.W. 20°, and at the south end 

 S.E. 15°. The Basaltic Whin Sill here has broken through a 

 thick limestone, and its relative position is higher by about 

 four hundred feet, than in the neighbourhood of Bamburgh. 

 Southward of this the basalt has an unbroken, but some- 

 what winding course inland for two miles, by Old Newton, 

 Newbiggin, and Embleton, with extensions down to the sea- 

 shore at Newton Haven and Emblestone. At Spittleford, it 

 is near to the Ebb's Nook limestone, which seems to dip 

 under it ; and here and also at Ebb's Nook and partly at 

 Newton this limestone is magnesian, and of a buff colour. At 

 Dunstanburgh, less than half-a-mile eastward, the columnar 

 basalt on the sea-shore rises into a cliff, one hundred feet 

 high, which, as at Bamburgh, is crested by a great medieval 



* The following is the succession of limestones in the calcareous division of 

 the Mountain Limestone in North Nor thumb erlad ; to each I have given a 

 distinctive name : — 



Feet. 



20 



25 



1. Harlow Hill Limestone . . 

 Other Strata 



2. Netherwitton Limestone . . 6 

 Strata 200 



3. Chirm Limestone 14 



Strata 72 



4. Ebb's Nook, or Ten Yard ) 



Limestone ) 



Strata 160 



5. Denwick Lane, or Eight) 



Yard Limestone J 



Strata 60 



6. Little Mill, or Six Yard) 



Limestone ) 



Strata 106 



30 



28 



22 



743 



See History of Alnwic/c, Vol. II., p.p. 448-451. 



Feet. 

 .. 743 



Brought forward 



Dark Limestone 8 



Strata 30 



Main, Sunderland, or Nine ) „- 



Yard Limestone ) 



Strata 304 



Stone Close, or Five Yard \ 



Limestone / 



Strata 342 



Hobberlaw, or Four Yard 



Limestone 



Strata ' 112 



11. Dun, or Two Yard Lime-) - 



10 



16 



15 



stone 



1603 



