bearing becoming E. and W. and the dip N. at an angle of 20": at the point where the change begins to take place, the strata are very much twisted and broken. The limestone contains large veins of calcareous spar, which in some places has red sulphate of barytes disseminated through it. I also observed that mineral in the interior of the shells that are found in the limestone. In the quarry on the opposite side of the road, there is also great irregularity in the position of the limestone strata: in some places their bearing is N.E. and S.W. with a dip to the N.W. of 40°; in others, their bearing is N. and S. and their dip E. In this quarry I found a specimen of a madreporite, resembling in form the lit host rot ion of Lhwyd, but much smaller in size. This is the same fossil that is represented in plate V. fig. 3 and 6 of the second volume of Parkinson's Organic Remains.
$ 62. In the road from Ledbury to Longdon, by the Holly-Bush Hill, the argillaceous slaty rock, which is the most prevalent, varies considerably in its direction and dip. In the place where I first observed it, after leaving the limestone hills above Ledbury, its bearing was N. and S. with a dip of 65° to the E. rising up to these hills; as it recedes from them, the angle of inclination gradually diminishes. At Low Hurst, the bearing is from N.E. to S.W. with a dip of 50° N.W. Near Castleditch, the seat of Lord Somers, I found the same coarse sandstone that occurs in vertical strata at the foot of the End Hill, as mentioned in § 47; the bearing of the strata in this place is N.E. and S.W. with a dip of 30° N.W. Proceeding eastward, towards the Malvern range, the argillaceous rock again occurs upon the rise of the Holly-Bush Hill, in thin strata bearing N. and S. and dipping W. at an angle of 70°.
§ 63. It appears from the preceding account, that the direction of the stratified rocks is, with a few exceptions, parallel to that of
