Correspondence. 137 
New Red Sandstone, I have sent you a photograph (PI. IV.) of the 
surface of the slab, showing both large and small marks, just as if 
an old hoofed animal and several young ones had crossed the sand. 
The slab is 15 inches by 12; and as it has formed part of a pave- 
ment in the village of Crook for about seven years, it has been 
somewhat foot-worn. The sandstone from which the slab comes is 
thick-bedded and good for building above, and laminated lower 
down in layers from 14 to 4 inches thick, of a whitey-brown 
colour, and used for flagging. The marked surfaces of the sandstone 
are often covered by a seam of sandy clay from 1 to 3 inches thick. 
—Yours, &c. _ JosepH Durr. 
Hounter-Hix Corracr, Ernerty, near BrsHop-Aucktanp: Dec. 14, 1864. 
Notre.—Semicircular impressions, with a raised border, but of 
larger size than those noticed by Mr. Duff, have been described by 
Mr. Babbage, in the Proceed. Geol. Soc., vol. ii. p. 439, as occurring 
in the Farewell Rock (Millstone-grit) of South Wales ; and others 
have been noticed in the Old Red Sandstone of Forfarshire, where 
they have been known as ‘ Kelpies’ Feet.’ (Lyell.) 
The sand resting against stranded Meduse on a beach, and against 
the hoof-shaped egg-cases of Natice, has been suggested (by Lyell) 
as a possible cause for such markings.—Epir. 
EXPLANATION OF PLATE IV. 
Surface-marks on a slab of Carboniferous Sandstone, from near Bishop- 
Auckland, rather less than half the natural size. Fac-simile (on zinc) of 
a Photograph. 
To the Editor of the GEOLOGICAL MAGAZINE. 
Srr,— May I be allowed to suggest that part of the GEOLOGICAL 
Macazine be devoted to Notes and Queries? They would prove a 
source of much interest to country Geologists, and form a medium of 
communication between distant subscribers. No doubt many points 
of interest are lost from the fact that local observers have no 
medium through which they may explain their doubts and confess 
their ignorances. Would you, Mr. Editor, put yourself out of the 
way to answer questions touching facts of geological interest, not 
generally known, and will you allow me to close this letter with one 
or two queries? 
1. What is the present generally received opinion as to the origin 
and formation of Flints in Chalk; and where can I find the latesé 
accounts of them? [See the Report of the Norwich Geological 
Society, at p. 182; also Lyell’s new edition of the ‘ Elements of 
Geology’ just out. ] 
2. Which is the highest chalk in England, and what relation does 
it bear to the Maestricht Beds? [The Norwich Chalk ; but some- 
what older than that of Maestricht. | 
8. Required a classified stratigraphical account of the Chalk- 
formation. [See the Notice of M. Reyneés’ Memoir, at p. 113. ] 
Yours, &c., G.D 
