ON EXCAVATIONS IN THE PALEOZOIC ROCKS OF WALES, &C. 2o7 



Ft. lu. 

 <fj A dark grey limestone with many phosphatic lumps, some 



glauconite, and having purple and green patches of colour . 1 

 [Fossils more fragmentary, not yet separately collected.] 

 <f, A greenish grev rock with plentiful black phosphatic lumps . 9 



[Fossils fragmentary, not yet separately' collected.] 



e. The French Grey Limestone : — 



A pale pinkish grey limestone in two bands, each about 3 inches 



thick, with a few pieces of dark phosphatic material . , G 



There are some patches of this limestone v/hich have a granular or 

 sandy aspect, and the colour is then greenish. 



Anomocare rel Agraulos sp., a very pustulate form ; fragments of 

 Olenellus sp. and Brachiopods. 



f. The Olenelhos Limestone : — 



Immediately below the French grey limestone the cutting showed 

 some red sandy clay, and embedded in this material there 

 protruded from the botrom of the excavation some nodules of 

 red sandy limestone characteristic of the Olenellus Limestone, 

 as seen in the C'omley Quarry, and j-ielding fragments of 

 Olenellus and Microdiscus sp. 



Total thickness of red material .... 2 G 



g. The Lower Comley Sandstone : — 



jfi Greenish soft sandstone or sandy shale, cf. bed/,, Section 

 No. 1 (base not seen) 



Some 12 feet be3'ond the end of the trench a trial hole (No. G on 

 map) was excavated disclosing — 



Qo Green sandstone, cf. beds/.. Section No. I. 



West End of the Section. 



NoTE.^About 30 feet east from the eastern end of the Trench a trial-hole (No. 7 

 on map) was sunk at the site of an old saw-pit, disclosing comminuted pale grey 

 shale exactly like that of bed a, Section 2, above. 



At a further distance of about 60 feet in tlio same directio'i another trial-hole 

 (No. 8 on map) was sunk near the Comley Brook. This disclosed clayey material 

 similar to that found above the shale in Trial-hole No. 7, but having in it some 

 angular pieces of brownish green, flaggy, glauconitic gri', with small quartz pebbles. 

 No dip or strike could be determined here. 



Excavation No. Z.— North End of Dairy Ilill, about 200 yards 

 south-east of the Comley Quarry, 



I made this excavation for the purpose of ascertaining the structure 

 of .Dairy Hill. Professor Lapworth had mapped it as a dome, and had 

 found fragments both of the 01enellu.s Limestone and of the Quarry 

 Ridge grits in the surface of an old lane, which curves round the north 

 end of Dairy Hill (see nap), but it was uncertain if they were in situ. 

 Holes were mads in the south bank of the lane, which is here about 

 8 feet high, and disclosed plentiful nodules of the Olenellus Lime- 

 stone and of a green standstone referable to the Lower Comley Sand- 

 stone (beds f of the Quarry) beneath it. The Quarry Ridge grit (the 

 conglomeratic portion) is traceable along the road surface in a curved line 

 more or less parallel to the contour of Dairy Hill, and the whole of the 

 bods dip north, 



