446 C. T. Clough—The Whin Sill of Teesdale. 
Bottom limestone was taken from the Bands Mine, Harwood, and 
was found to have the following composition :— 
Bato?) et Bb ead Ce thee dae eee. 10) ee 
Mapmesia sts tees ate ook) wee hte alg eee 
AINA, 5.6... b chess cay toise piace! Wine? oe oar [seney gee ae ee 
Protoxide of Iron... 3 Bid aoe ao 0-11 
Protoxide of Manganese... 2. eee vee tee wee ee © 006 
Baling | GP ee hay et ae a ON) ee 
@axbonic Acid! 26.5 cide péswen lave (Pave (Goel cael Ee. ue ea 
Sulphusic Acid 9.205 sde.< sees yess jee Piney) veep ey 
Organic matter ©... wer see cen). pee) pene cee eee een aes 
100-16 
Specific gravity 2°67 
A specimen of sandstone occurring immediately below this lime- 
stone, and from the same locality, had the following composition :— 
Silica 95°55 
Alumina ane 2°30 
Peroxide of Iron ... 0°25 
Lime aes 0:80 
Wiatet~.<3 Ske 0°15 
Carbonic Acid 0-88 
99-93 
Specific gravity 2°57 
A specimen of shale occurring immediately above this limestone, 
and taken from the neighbourhood of Moor House, Garrigill, had 
the following composition :— 
Silica 
Alumina ree 
Protoxide of Iron 
Protoxide of Manganese 
Lime Rae ae Meee 
Magnesia 
Potash .., BO Ms Baca peer. EES an? Foe 
Oda yee Casi rei shies ede cid Pees eet as 
Phosplonie Acids): Sete Sialpt let eh coetig 
Hygroscopic 2-70 
Water | Coebinet 6-70 | 
Specific gravity 2°62 
Calculating the chemical composition of the 200ft. of beds from 
these data, we find that it should contain in 100 parts :— 
BUSS sen baa NEG aim arignle Hots) he 48-206 
Silica .., 
Alumina bes 
Tron Protoxide ... 
Tron Peroxide si 
Protoxide of Manganese 
Lime . ‘ 
Magnesia 
Potash 
Soda ... 
Waters. sib 
Phosphoric Acid... 
Organic matter ... 
Carbonic Acid 
sulphone Word Wie. ete 
And should be of specific gravity 2°62. 
48-30 
29°69 
5:98 
0:07 
0:66 
1-79 
3°96 
0°39 
0-12 
9-40 
100-36 
9°835 
1°832 
*612 
042 
19-332 
“957 
1188 
sali) 
2°883 
036 
°116 
15-477 
066 
