TATE ON THE GEOLOGY OF BEADNELL. 



59 



Alumina, Magnesia, & Iron . 



Alumina, Magnesia,Iron,and 

 Potash 



Alumina, Iron, and Potash . 

 Alumina, Iron, Potash, 

 LiTHiA, AND Manganese . 



Magnesia, Lime, and Protox- 

 ide Iron 



Magnesia and Iron 



34. 



35. 

 36. 



37. 

 38. 



39. 

 40. 



41. 

 42. 



43. 



44. 

 45. 

 46. 



Ripidolite. 

 Chlorite. 



Biotite or 3Ing7iesia-Mica. 



Pinite. Altered Cordierite, some Mg re- 

 placed by K. 



Tourmaline. A mineral of various and com- 

 plicated chemical constitution. Contains 

 Na with K, also about 9 per cent, of 

 Boracic acid, and 3 per cent, of Fluorine. 



Potash-Mica. Has sometimes Mn. 



Lejyidolite, or Lithia-Mica. Also Hydi'O- 

 fluoric acid. 



Hornhlende. Often some A\. 

 A ugite. ditto. 



Diallage. Generally some Al, also H and 

 Mn. 



Jlyperstkene. Generally A\ and Mn. 

 Olivine. 



Bronzite. Some H. 



THE GEOLOGY OF BEADNELL, IN THE COUNTY OF 

 NORTHUMBERLAND, WITH A DESCRIPTION OF SOME 

 ANNELIDS OF THE CARBONIF^EROUS FORMATION. 



By George Tate, Esq. F.G.S. 

 Read hefore the Berwickshire Naturalists Club, at Beadnell, in May, 1858. 



A SECTION along the coast from Ebbs Nook to Annstead Bay, of 

 nearly one and a half miles in length, exhibits a fine series of rocks 

 belonging to the Mountain Limestone Formation. Thick sandstones 

 and limestones, shales with ironstone, and coal-seams are intercalated 

 with each other ; and these strata are traversed by a lead-vein and a 

 basaltic dyke. As we wander along the shore, we meet with evidences 

 of sea-deposits in the limestones and calcareous shales, wherein are 

 embedded many corals and mollusks ; the sandstones, shales, and coal 

 afford relics of the vegetation of the Carboniferous Era ; some slaty 

 sandstones give distinct indications of ancient shallow seas and coast- 

 lines, whereon the waves broke gently and over which worms crawled ; 

 while the basaltic dyke tells of the play of internal forces, rending 

 asunder the vast mass of stratified rocks, and pouring molten lava 

 into the fissures. 



