Yorkshire Naturalists at Guisborough. 393 



author were criticised. At the close of a most interesting- 

 meeting- votes of thanks were accorded to the writers of the 

 papers, to Miss Staveley and Captain Turton for permission to 

 visit their estates, to the owners of Gribdale Quarries and 

 Slapeworth Mines, and to all who had contributed to the 

 success of the meeting. 



Mr. J. J. Burton writes : — Guisborough rests on the Middle 

 Lias, and is on the level of the drift-covered plain, but starting- 

 from the Railway Station the rise to the Cleveland Moorland is 

 rapid, and part of the Middle Lias zones and the whole series 

 of the LTpper Lias zones are passed over until the Lower Oolite 

 is reached, topping- almost all the neighbouring hills. Owing- 

 to restrictions imposed upon the members, only a few exposures 

 of cliff sections could be examined, but it was seen that the 

 inland strata were identical with the coast sections examined at 

 Loftus last year, although the thickness of the seam differed 

 from the coast exposures. Perhaps the best sections were 

 found in the old disused alum shale quarries [^A. conimunis zone), 

 which at different periods of the excursions were carefully 

 examined, and were found to contain great numbers of the 

 characteristic fossils. On the shoulders of Roseberry Topping- 

 two outcrops of the main seam of ironstone in the A. spinatns 

 zone were noticed, and the top of this hill was found to consist 

 of a mass of the Lower Oolite. The hill is an outlier of conical 

 shape, especially towards the north and west, and is interesting 

 not only from the fact that it offers a splendid point of view 

 from which a vast extent of hill and dale can be seen, but 

 because it exhibits on its steep faces the ph3^sical differences of 

 alternating- hard sandstones and soft shales when exposed to 

 weather influences. The contour gives a regular succession of 

 gentle slopes and terraces, with abrupt margins and steep 

 declivities. Below the Oolite the Dogger is found all round 

 the district, but here it is entirely absent. The diagram will 

 shew the succession of strata exhibited in this hill, and the 

 approximate thickness of each. The thickness of the several 

 zones is incorrectly given in the Geological Surveys, and 

 requires revision. 



The well-known Cleveland Whin Dyke cuts through the 

 south side of Roseberry, and extends to near Whitby on the 

 one hand, and far into the county of Durham on the other. 

 Here it reaches its maximum thickness, so far as it has been 

 exposed, and as it has been very extensively quarried for road 



.1906 November i. 



2 C 



