368 
THE GEOLOGIST. 
are succeeded by thick beds of Oxford clay, resting on hard, sandy, and ferrn- 
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 Tossils of the Yorkshire 
Lias Described from Xature," 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, youi's, &c., E. Tixdall, Bridlington. 
Old Red Coexstoxe. — June 5th. — Received a visit from Messrs. Powrie 
and Page, whom I accompanied to the Park-kOl Cornstone, and red and grey 
sandstones. The cornstone is overlaid by a coarse yellow-coloured sandstone, 
with interaiediate stripes of red ar.d blue marls, and strikingly, as remarked by 
Mr. Powrie, resembles the Dura Den beds, in confirmation of my own views. 
The true Holopti/chian- Red, like Clashbinnie, indicates and abounds in the 
scales of this typical fish. The JParka 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 g^ex sandstone iQ)S?,\[s. 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. PoAvrie'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 Stratheam, 
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 colom% of very loose texture, are mixed up 
with hard laminated beds of tUestone, 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 Ci/pricardia, 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 t.ie Geological Staff of Surveyors, 
accompanied me on the occasion, and concurred in the views expressed above. 
— From Dr. Anderson's (Xewburgh) Notulce Geologicce. 
