238 REPORTS OX THE STATE OF SCIENCE. 



It is obvious that the lane has at this point cut well into the northern 

 end of a dome of the Quarry Ridge grits and has just reached the 

 Olenellus Limestone and the Lower Comley Sandstone below it. I 

 found no traces of any of the French Grey, Grey, or Black Lime- 

 stones in this excavation ; further excavations are necessary before 

 their apparent absence can be accounted for. 



The Olenellus Limestone in the bed and bank of the road yielded 

 fragments of Olenellus having characteristics of 0. (ffolmia) CcUlavei, 

 Lapw., and Linnarsonia. 



Excavation No. 4. — North Spur of Little Caradoc, 200 yards west- 

 south-west of the Comley Quarry. 



The object of this excavation was to open up a section of the lowest 

 beds of the Lower Comley Sandstone and to ascertain the character of theii* 

 junction with the underlying Wrekin Quartzite below. The Quartzite is 

 known to wrap round the eastern side of Little Caradoc Hill, and there 

 are traces of it in this northern spur. There are also at this point 

 some natural exposures of greenish micaceous sandstone, not unlike the 

 Comley Sandstone of the Quarry, and of a coarse grained dolerite which, 

 higher up the hill, intervenes between tlie Quartzite and the core of Pre- 

 Cambrian rocks. 



Two trenches were opened in a piece of uncultivated ground west of 

 the Comley Quarry, and separated from it by nearly 200 yards of culti- 

 vated land showing no exposure of solid rock. 



One of these trenches was continued east, as far as circumstances 

 allowed, into the arable field ; the other was carried west, to find the 

 Quartzite and iix its point of contact with the dolerite. 



Some of the beds in the tirst trench could be exactly matched in the 

 second, and the sections displayed in both are given below as one con- 

 tinuous whole. 



The beds dip west, but as they are, in all probability, invertetl, 

 the section is described from east to west, as representing the descending 

 order of the beds. 



a. Lower Comley Sandstone. 



Ft. 111. 



a, Fiue-grained greenish micaceous sandstones in compact, or 

 flaggy, or rubbly beds, dipping about .50" westwanis, and 

 var\ ing a good deal in hardness .... About 30 

 Yielding Hyulichns sp. near H. tenvistriata, Linn. 

 a„ Fine grit with well-rounded grains, 2 inches. 

 Sandy clay, 4 incties. 

 Very dark coarse grit with some dark green grains (?) glauconite, 



2 inches. 

 Bluish-grey cilcareous giit weathering to a dark incoherent sand- 

 rock, 12 inches. 

 Grey clayey shale, 6 inches 



Rib of hard fine-grained micaceous sandstone, 18 inches. 

 Sandy clay, 12 inches .... Total thickness of a.j 5 

 flj Fine-grained greenish fla?gy micaceous sandstones . . . 15 

 a^ Hard greenish micaceous sandstones in more compact beds dip- 

 ping westerly at about 50° 12 



a-^ Much harder brownish micaceous sandstone having a more quart- 



zite-like aspect 4 



* . . 



Total thickness of sandstones seen , . , . 66 U 



