in the Neighbourhood of Bristol. 203 



many cwts. in the fields between Ham Green and Leigh, and I am 

 inclined to believe that these are derived from the red loam which 

 lies between the two beds, for I found a mass of it in a ditch lately 

 dug on the slope of the hill below the basset of the upper breccia ; 

 but the circumstances were not altogether decisive. The sulphate 

 of strontian from this place is seldom found well crystallized, the best 

 of the crystals that I have met with being tables not exceeding ^rth 

 of an inch in length. The entire masses are generally snow white, 

 having the appearance of a coarse grained loaf-sugar, but sometimes 

 they acquire a reddish hue from a small quantity of ochre. 



Small veins of galena are found in the breccia. The breccia is 

 found near to Abbot's Leigh, from whence it extends in a position 

 almost horizontal to Crokerne ; and it probably occupies the whole 

 space included by a line drawn from Leigh through Failand, Charlton, 

 Portbury and Portishead, and thence returning again through Crokerne 

 to Leigh. On the opposite side of the river it forms the stratum 

 beneath Shirhampton, and runs up the valley below King's Weston 

 hill, extending to the east as far as Sneed Park. In some parts it is 

 found at so high an elevation as to lead to a belief that there may 

 be more than two beds of the breccia : in whatever situation how- 

 ever it is met with its general characters are the same. 



The red loamy earth at Hung-road is traversed by veins of fibrous 

 carbonate of lime, which are about an inch thick, and contains hollow 

 calcareous nodules which are often lined on their inner surfaces with 

 beautiful calcareous and siliceous crystals. The quartz varies but 

 little in form ; it is almost always in very short six-sided prisms 

 terminated by two six-sided pyramids. It sometimes contains acicular 

 crystals of iron ore : is generally transparent and colourless, but 

 sometimes assumes an amethystine tint. The calcareous crystals vary 

 very much in form, sometimes exhibiting that of the primitive 



