S4f6 MINERALOGY OF THE REDHEAD. 



deposites around its margin and that of the stream 

 which runs from it, a copious ferruginous preci- 

 pitate. I was surprised to find in the ochry mud, 

 within a few yards of the spring, two species of 

 fresh-water shell-fish, the Cydas cornea^ and the 

 Jayrnncea put r is. 



Having thus offered a few remarks on the form 

 and structure of the Alluvial strata, I shall now 

 state the observations which I had an opportunity 

 of making on the Floetz rocks of the district. The 

 general line of bearing which these rocks observe, 

 » is from east to west, varying in some places a few 

 degrees to the north of east, and the south of west. 

 The dip is tov/ards the south, at various angles, 

 but seldom below ten or above twenty-five de- 

 grees, and the strata preserve nearly the same de- 

 gree of thickness in the different parts of their 

 course. The rock which we shall first describe, 

 is, ' 



1.— Red Sandstone. The rocks of sandstone 

 appear on the coast to the south of the harbour of 

 Aberbrothick, and extend in a north-easterly di- 

 rection to the flag-staff at Ethie, including a space 

 of nearly five miles. On the great scale, they may 

 be considered as forming one great bed, nearly 

 two miles in thickness, divided into regular strata. 



