308 
THE GEOLOGIST. 
granite, compared with the sedimentary rocks in New South Wales, being 
as 3 to 1, while in Tasmania they are as 7 to 1. Of rocks having more 
than 60 per cent, of lime as compared to rocks with less, the proportion in 
New South Wales is 4"1 to 1 ; in Tasmania the case is reversed, the pro- 
portion 1 to 3. Count Strzelecki attributes this diflference to volcanic 
agencies, which have beenmore prevalent in Tasmania than in the Australian 
continent. Some specimens of serpentine veined with asbestos, from the 
Asbestos Hills, show themselves susceptible of a high degree of polish. 
Black and white marbles from the Florentine Valley and from Chudlegh 
are shoAvn ; and of building stones, specimens from numerous quarries are 
exhibited by Mr, Calder ; there are also some grindstones of large size and 
fine quality, and some smaller ones said to be eminently suitable for glass- 
cutting. The beautiful marbles exhibited have hitherto only been used 
for making lime, but properly polished they Avill be well suited for internal 
architectural decorations. Topazes are exhibited from Flinders Island. 
Pembeokeshiee Antheacite. — From Broadmoor Colliery, near Tenby, 
and Landshipping Colliery, Haverford West (South Wales). Analysis : — 
Carbon 93. Hydrogen 3-08. Azote '54. Sulphur -68. Oxygen 1-67. 
Ash 1"03. The following is the order of the strata : — 
Bkoadmoor. 
1. Yellow magnesian sandstone, or lime- 
stone. 
2. "Eock Vein," about 3 ft. of good 
anthracite. 
3. Dunstone (Fire Clay). 
4. Argillaceous aud arenaceous rock with 
nodules of ironstoue. 
5. "Low Vein," 1 ft. 8 iu. of inferior 
culm. 
6. Fire Clay. 
7. Hard siliceous rock with a few argil- 
laceous bands. 
8. Argillaceous slate with bands of iron- 
stone. 
9. "Timber Vein," varying from 7 
to 10 feet thick.* 
10. Fire Clay. 
Landshipping. 
1. Argillaceous arenaceous shales with 
abundant nodules of ironstone. 
2. " Bright Vein," about 4 ft. 6 in. of 
culm, of a clear bi'ight aspect. 
3. "Dunstone," or Fire Clay. 
4. Yellow magnesian sandstone, with a 
few bands of shales. 
5. "Rock Vein," about 2 ft. 6 in. of 
good stone coal. 
6. Dunstone (Fire Clay). 
7. Dark argillaceous slate, or slaty earth. 
8. "Timber Vein," an anthracite 
seam varying from 6 to 8 feet. 
9. Dunstone (Fire Clay). 
10. " Little Vein," ] ft. 8 in. of culm. 
11. Dunstone (Fire Clay). 
12. Compact argillaceous rock with some 
bands of iron-ore. 
13. Hard siliceous aud calcareous rock 
about 2 feet. 
14. " North Vein," 1 feet 3 inches to 1 ft. 
6 in. of anthracite. 
There are several small seams of coal below the " Timber Yein," the 
largest and most important of which are " the Lower Level " ( = 1 ft. 8 in.) 
and the Kilgetty ( = 1 ft. 8 in. to 4 feet), considered the best anthracite. 
The former is about 70 fathoms below the " Timber Vein," and the latter 
* The beds printed in black letter are those of which samples are in the Exhibition* 
