368 



THE GEOLOGIST. 



are succeeded by thick beds of Oxford clay, resting on hard, sandy, and ferru- 

 ginous beds called Kelloway rock, forming the bold romantic cliffs on which 

 stands Scarborough castle. In conclusion we state that the young 

 gentlemen from Huddersfield may, when they arrive at Whitby, for one 

 shilling and sixpence, purchase a book called " The Fossils of the Yorkshire 

 Lias Described from Nature," which book contains a short outline of the 

 geology of the Yorkshire coast, illustrated with sections, and intended as a 

 guide for strangers. There is also a map, by Mr. Simpson, price sixpence, to 

 may be had at Silvestor Reeds', Whitby, or in London of Whittaker and Co., 

 Ave Maria Lane. — I am, Sir, yours, &c, E. Tindall, Bridlington. 



Old Red Cornstone. — June 5th. — Received a visit from Messrs. Powrie 

 and Page, whom I accompanied to the Park-kill Cornstone, and red and grey 

 sandstones. The cornstone is overlaid by a coarse yellow-coloured sandstone, 

 with intermediate stripes of red arid blue marls, and strikingly, as remarked by 

 Mr. Powrie, resembles the Dura Den beds, in confirmation of my own views. 

 The true Holoptychian Red, like Clashbinnie, indicates and abounds in the 

 scales of this typical fish. The 'Parka decipiens tilestone, the first discovered 

 habitat of this fossil, was next examined ; where amongst the debris I suc- 

 ceeded in finding a beautiful specimen of Pterygotus anglicus, the first of 

 the kind ever detected in this portion of the deposit. The Balruddery and 

 Tealing beds constitute the extension of the formation on the opposite slopes 

 of the Tay. 



June 19th. — Visited Mr. Powrie's hospitable mansion, and was truly 

 delighted with his rich collection of the grey sandstone fossils. All the quarries 

 around, in a circumference of thirty miles, were examined during my stay, and 

 many interesting specimens obtained, especially from Parnell, so rich in Acan- 

 thodus, Climatius, Diplocanthus, &c. Two new and undescribed fossils enrich 

 Mr. Powrie's collection, obtained lately in the quarries of Turim Hill, and one 

 of them with its long tapering tail and caudal fin intermediate to, but strik- 

 ingly resembling the Pteraspis and Cephalaspis of the same rock. 



July 6th. — Had an interesting and successful day at Dron, in Strathearn, 

 and about nine miles to the westward of Park-hill. The tilestone deposit here 

 dips under, and is also interposed among the traps of the Ochil range. Thin 

 marly beds of a bluish and whitish colour, of very loose texture, are mixed up 

 with hard laminated beds of tilestone, and there is one thick bed of half- 

 indurated clay of twenty feet nearly in thickness. I have not observed this 

 mud accumulation in any other locality of the grey sandstone series, and which, 

 indicates perhaps peculiar littoral conditions in the estuary or sea in which it 

 was deposited. Shells in the greatest abundance are embedded in the mud ; 

 many of them are very minute, and microscopic, others are quite cognizable by 

 the eye, and some are fully a quarter of an inch in length. I regarded them 

 at first as Crustacea, but am now convinced they are true shells, probably of 

 the genus Cypricardia, or some allied form. The" importance of this discovery 

 in our Scottish Devonian system is great, as the first of the conchifera found 

 anywhere in the Old Red north of the Tweed, to explore it fully will be 

 an object of interest. Mr. H. H. Howel, of tie Geological Staff of Surveyors, 

 accompanied me on the occasion, and concurred in the views expressed above. 

 — Prom Dr. Anderson's (Newburgh) Notulce Geologic^. 



