TBANSACTIONS OF SECTION C. 769 



limestone is very occasionally compact and sub-crystalline. It consists for the 

 most part of an aggregate of recrystallised materials, giving it the appearance of a 

 sandstone. Very occasionally quartz pebbles of small size are met with in the 

 denser portion. Certain markings on the irregular bed surfaces, which resembled 

 the rude internal casts of molluscs, led us to make a closer investigation, which, 

 from feeble casts and cavities, as if resulting from the solution of shell matter, 

 introduced us to certain proofs of the presence of organisms. These are in a very 

 imperfect state of preservation, but enough of the form remains to confidendy 

 assert the presence of Schizodus and of Aucella Hausmanni, forms which 

 characterise the Upper Magnesian limestone. 



The fossil casts are plentiful, sometimes occurring through the stone for a 

 thickness of 2 or 3 feet. Through their imperfect condition one can only say 

 that the other casts suggested Schizodus Schlotheimii, IS. rotundatus, Edniondiit, 

 Gervillia antiqua. In brick pits near the stone pits, over a floor of Magnesian 

 limestone, we find a section of from 5 to 15 feet of red marly clay, with pale 

 brown and greenish arenaceous beds and bands in places apparently dolomitic and 

 resemblmg the Magnesian limestone below. These clays are immediately overlain 

 by the Red sandstone (lower mottled) of the Bunter. Proceeding towards 

 Nottingham sections of Bunter pebble beds are shown, exhibiting their false 

 bedded courses, and containing occasional lines of pebbles or scattered pebbles of 

 hard liver-coloured quartzite and other stones, amongst which we noticed fragments 

 of igneous rock, one quartz porphyry being of a type familiar in Germany and in 

 the Teignmouth breccias of the south-west of England. The marly clay with 

 intercalated sandstones recalls the passage beds of marl and sandstone on the coast 

 between Exmouth and Straight Point, though the latter are more than ten times 

 its thickness. 



I 



5. Note on the ' Himlach ' Stone near Nottingham. 

 By Professor B. Hull, F.R.S., F.G.8. 



Professor F. Clowes having expressed his opinion at a previous meeting of the 

 Section ' that the Himlack stone had been formed artificially by quarrying out the 

 rock which formerly inclosed it, the author desired to controvert this statement, and 

 maintained that this remarkable rock was a monument of natural denuding agency, 

 either marine or atmospheric. Some thirty years since, when working on the 

 Geological Survey, he had sketched and described this rock, as will be seen on 

 reference to the Survey memoir ' On the Triassic and Permian Rocks of the 

 Midland Counties ' (1869), p. 34. The rock, which is 20 feet high, consists in its 

 upper part of the ' pebble beds,' and in its lower of the ' lower mottled sandstone,' 

 of the Bunter sandstone ; and at the time the memoir was written the author 

 considered the rock to be a remnant of marine denudation, an old sea-stack of the 

 post-Pliocene period. 



Its great antiquity is evinced by its name 'Himlack,' which is clearly a 

 Celtic word. 



6. On the Junction of Permian and Triassic BocJcs at Stocliport. 

 By J. W. Gray, F.G.8., and Percy F. Kendall, F.G.S. 



The Stockport section has for nearly thirty years been regarded as furnishing 

 the typical illustration of an unconformity between the Permian rocks and the 

 overlying Bunter. The Geological Survey memoir relating to the, district gives 

 the following three vertical sections : — 



Heaton Mersey Hope Hill Stockport 



West East 



Trias. Trias. Trias. 



Permian marl, 129 feet. Permian marl, 25 feet. Permian marl (absent). 

 Permian sandstone. Permian sandstone. Permian sandstone. 



' Page 745. 

 1893. 3 D 



