G. W. Lamphigh — The Bridlington 8hell-hed, etc. 541 



not included in the publislied lists of the "Bridlington Crag" shells. 

 These are Pecten opercularis, and Mya truncata, var. Uddevallensis. 



The Dimlington Shell-beds. — I have not yet been able to find 

 at Dimlington the bed from which Sir Charles Lyell's party obtained 

 their shells,^ but last spring I found streaks, identical in appearance 

 with those at Bridlington, in an exposure of the Basement Clay on 

 the beach a little to the north of the high land. I examined them 

 for shells, and found many, but all crushed. I also got three large 

 hardened casts in gritty sand of Pholas borings, with the Pholas 

 (P. crispata) imbedded in the midst. Similar hardened casts are 

 common at Bridlington. About two months ago I again saw an 

 exposure of the Basement Clay at Dimlington, — this time of very 

 unusual extent, — stretching for nearly a mile along the beach near 

 low-water mark. The clay was throughout extraordinarily patchy, 

 and was, in fact, in good part made up of masses of included 

 material, of all sizes, and of diverse composition. Many consisted 

 of fine blue clays mixed with sand, like those at Bridlington ; and 

 from these I obtained some very fine and perfect shells. Others 

 however contained no shells, were almost black in colour, and 

 seemed as if made up of the waste of some of the pyritous 

 secondary clays, for when the sun shone hot upon them they 

 smelt very strongly, and weathered in the cliff with a dirty yellow 

 efflorescence and bad odour, like the lowest beds of the Lower 

 Neocomian at Speeton. They are, indeed, quite possibly made up, 

 in part, of these beds, as I noticed a few Neocomian fossils in 

 Boulder-clay. Some of the patches, again, were of a rusty brown • 

 and one of these contained a few broken shells, which were possibly 

 derivative. 



I also found in the bottom of the cliif a streak of crushed shells, 

 much in the same position as the one already known. It ran irre- 

 gularly through a mass of dark-blue clay, without stones, bounded 

 on all sides by Boulder-clay in the same way as those on the beach; 

 the shells, chiefly Saxtcava rugosa, were crushed into small fragments, 

 and the whole mass showed slickensides. In one or two cases the 

 valves seemed to have been united. I found, some time ago, a single 

 specimen of TelUna baltJiica uncrushed and with valves united, in a 

 little pocket of sand near the same place. 



The Boulder-clay itself was crammed in places with detached 

 and fragmentary valves. It also contained a few huge boulders of 

 far-travelled rocks. One mass of gneiss was about 5 feet by 2i 

 by 3. 



From the Boulder-clay and the patches I obtained twenty-seven 

 species (see Appendix F), of which all except two have been 

 found at Bridlington. These are, Thracia pubescens, and Cardium 

 Groenlandicum. 



Similar Beds in Filey Bay. — I have already recorded ^ the dis- 



^ In the discussion which followed this paper, Prof. Hughes, one of the dis- 

 coverers, satisfactorily accounted for this, as he said they took the bed away with 

 them, it being merely a curved streak of sand in Boulder-clay, like those I have seen. 



2 Proc. Yorkshire Geol. Soc. for 1879, p. 169 ; and Geol. Mao. April, 1881, 

 p. 179. 



