128 GEOLOGY OF THE LOTHIANS. 



sandstone again appears underneath the greenstone, and at 

 the junction, and for a considerable distance from it, com- 

 pletely changes it into a characteristic hornstone. The 

 greenstone which overlies these sandstone strata runs boldly 

 into the sea, presenting vertical cliffs. On their eastern 

 side the sandstone strata are again met with dipping to the 

 N. N.E. at about 18% almost throughout their whole extent 

 altered, and presenting characters little differing from those 

 exhibited by the quartz rocks of primitive districts. The 

 strata between this point and Burntisland afford nothing 

 deserving detail ; as sandstone, which dips in general to the 

 north, forms, with the exception of one or two greenstone 

 masses, the whole of the exposed rocks on the shore. On 

 advancing into the interior of the country, there is a con- 

 tinuation of the same general system of rocks as is visible 

 on the shore. The Bin Hill rises immediately to the north 

 of Burntisland, and exposes at its base, and for a consider- 

 able way up its acclivity, strata of white sandstone and 

 limestone. The rock which forms the principal mass of the 

 Bin Hill, is a coarse and easily disintegrated tufa, composed 

 of variously sized masses of trap rocks, limestone, shale, 

 and sandstone, imbedded in a base of earthy trap, and is 

 traversed in one part by a dyke of basalt, containing nume- 

 rous crystals of glassy felspar, and exhibiting an imperfectly 

 columnar structure. Natrolite is found in the tufa in the 

 form of imbedded amygdaloidal concretions. On the east 

 side of the Bin Hill the same series of strata appears which 

 is seen on the west, all dipping to the E. N.E. Basalt 

 occurs, forming a vein running parallel with these, but 

 the covered strata of the country prevents its relation to the 

 sandstone or tufa from being made out. On advancing 

 along the shore in the direction of Pettycur, no rocks are 

 observed for a considerable way, the coast being entirely 



