Vol. 62.] LIMESTONE OF THE JUENDIP ABEA. 363 



45°, and strike west 28° north. They lie 60 or 70 yards south- 

 west of limestones, which have precisely the same dip. Beyond 

 this point, the north-westward extension of the grit is concealed by 

 the Dolomitic Conglomerate. 



Down the valley, almost due south of the quarry, lies a second 

 old pit, worked in 1871. According to the Survey-memoir, this pit 

 was sunk through ' Lower Limestone Shales ' ; but, as Prof. Lloyd 

 Morgan stated, the shales in the spoil-heap yield no fossils, and 

 have the lithological character of Coal-Measure shales. 



Still farther down the valley, on the north-eastern slopes, are 

 several exposures of precisely-similar shales, and other exposures 

 of hard, sandy shales ; the southernmost of these exposures lies 

 quite 200 yards beyond the water-tank. Wherever the dip can be 

 made out, these shales are seen to dip southward. Grit is exposed, 

 in situ, on the slopes almost directly north of the tank, and loose 

 blocks can be found dispersedly all down the north-eastern slope of 

 the valley. 



On the south-western slope of the valley, in Hope Wood, the 

 shales are exposed at various points, to within a very short distance 

 of the limestone-bluff on the southern edge of the wood. 



(ii) The Carboniferous Limestone north and east 

 of the V alley. 



(a) The Upper Dibunophyllum-Zovlz. 



Wherever the limestone immediately north of the Millstone Grit 

 is exposed, and fossils can be found, the palaeontological characters 

 clearly indicate D 2 ; and, although the actual junction of the lime- 

 stone and the grit is nowhere exposed, there is never any suggestion 

 of unconformity. 



The best exposure is that north of the quarry. Here, the highest 

 limestones seen, which lie 20 yards (measured along the direction 

 of dip) from the lowest exposure of grit, contain much lenticular 

 chert, but have yielded no fossils. Fifty yards from the grit, how- 

 ever, the limestone still has the same dip, and certain beds are 

 highly fossiliferous. Productus <j> and Pr. punctato-fimbriatus are 

 very abundant, and Pr. sp. (convergent with Pr. margaritaceus) is 

 not uncommon ; these fossiliferous beds lie about 130 feet vertically 

 below the lowest grit of the quarry. 



North- westward, near the ruined farm-buildings, the limestone 

 60 or 70 yards from the grit (the dip here is less than at the first 

 exposure) contains abundant Productus <p. 



South-eastward are several small exposures of limestone, on the 

 north-eastern slope of the valley, all of which must lie very 

 near the Millstone Grit. In most cases the dip of the beds is 

 obscure; but, in all instances where it can be made out, it is seen to 

 be southward. Fossils are scarce, though I have obtained Cyaiho- 

 phyllums])., Lithostrotion Martini, mut., Athyris cf. expansa, Ohonetes 

 aff. comoides, and Productus sp. convergent with Pr. margaritaceus . 



