THE GEOLOGY OF THE WICK ROCKS VALLEY. 185 



band some crinoidal ossicles. The dip is from 40° to 50° in 

 a direction a little (5°-10°) to the South of West. 



Just beyond, where the path crosses the stream, on the 

 north side of the little bridge, are two quarries close together 

 (at the point marked f on the map). They should be ex- 

 amined carefully, since the incoming of calcareous conditions 

 (i.e., the commencement of the Upper Transition Beds are 

 very clearly seen. 



In the more westerly exposure in these quarries there is 

 first a pebble bed, five feet thick, with milky quartz ; then 

 a foot and a half of fine close-grained grit; then another 

 pebble bed also 1| feet thick, followed by grits and marly 

 shale. Between the two quarries, for they are adjacent to 

 each other, there are 7|- feet of shale very carbonaceous, 

 almost coal, below. Then follow twenty to twenty-five 

 feet of solid grit, with strong pebble beds at base. These 

 are succeeded by a bed with a curious irregularly mam- 

 millated surface. It is about one foot thick, very dense 

 and solid, and effervesces with acid. This is the first bed 

 with calcareous matter, and I think we may fairly regard 

 it as the first bed of the Upper Transition series, the strong 

 pebble bed being the base of the Millstone Grit. The 

 calcareous bed yielded Mr. H. H. Winwood and myself two 

 species of Lingula^ one of which appears to be L. parallela. 



Beneath this Lingula bed is a friable bed, from which the 

 lime has been partially or completely removed by water, 

 laden with carbonic acid soaking through. It is crowded 

 with fossils, among which Producta (? species) is con- 

 spicuous, together with a bivalve (? Nucula). I hope to 

 work out the fossils from these beds more fully. From this 

 point onwards limestone bands, many of them richly fossili- 

 ferous, are the prevalent rock, though there are also shales 

 and strong grit. They are the Upper Transition Beds. 



