NOTES AND QUERIES. 
39 
arrani^cd more or less at rii^lit angles to cacli other, and closely adhering, one 
set being parallel, or nearly so, to the dip, and the other to the strike 
ol" tlie beds. 
From this it would appear that the 
beds above and below had two distinct 
motions given to them, but at different 
intervals of time. In the example be- 
fore us we have evidence for believing 
tiiat at first one set of beds moved while 
tiie other remained stationary ; and that 
one half of the crushed intervening sub- 
stance, while adhering to the moving 
mass by cohesion was pulled into a state 
of striation to the amount of only one- 
half its thickness. The motion then 
suddenly ceased, and the adjoining beds 
were moved, but in a direction directly 
contrary to the first. Tlie remaining 
portion of the pulverized material fol- 
lowed this second impulse, and assumed 
a striated structure, the lines of whicli 
were parallel with the direction of the 
displacement and consequently at an 
opposite angle with that which was first 
formed. 
We have in Brockedon's patent pen- 
cils a famUar example of the recon- 
solidation of a powdered substance by 
the application of enormous pressure 
into a material harder and more free from gi'it, or other impui-ities, than the 
original native plumbago, and to tliis our slickensides bear a striking analogy. 
Dear sir, faithfully yours, Geo. V. Du Noyer, M.R.I.A., Geological Survey of 
Ireland. 
Published Accounts of Fossil Human Remains. — Sir, — Will you 
oblige me by answering the following query in the " Geologist." I ask as 
well for others as myself. Where may be procured the fullest and most re- 
liable information respecting fossil human remains that have been discovered in 
the world ? Subscriber, Redlands. — There is no connected account of the 
human remains discovered in various parts of the globe, and it is one of the 
objects of the papers on the " First Traces of Man on the Globe." now pub- 
lishing in this magazine, to give a collected account of all the reliable cases, 
and to give illustrations of the ancient ilint-weapons, etc., as also of the 
stone-implements recently, or stiU in use amongst savage tribes in various parts 
of the world. 
The best account of human remains published up to the present time will be 
found in the appendix to M. Boucher de Perthes' book. Other notices may be 
profitably consiilted, such as Dr. Mantell's paper, read at the Oxford meeting 
of the Archseological Institute, 1850, and M. Mareclde Serres' several papers 
in the BuUetin Soc. Geol. de France, Comptes Rendus, etc. 
Deposition of Warp. — Sir, — In " Notes and Queries," in the " Geolo- 
gist" for December last, W. Nottingham asks two questions, viz., 1st. "Wliere 
does the warp come from ? 2nd., How is it that the Humber and its tributaries 
— the Trent, Ouse, Don, etc., are the only rivers in Great Britain that deposit 
"warp"? 
When we take into consideration the fact that the Humber receives the 
Fragment of " Slickenside, " exhibiting 
two seta of stria; (full size). 
