SOUTH WALES. 
49 
Shelves 5 and 6 exliihit a number of S 2 )ecimens to illustrate the 
various shapes v/liich sucli nodules present, and some of the extraneous 
minerals which are sometimes found to crystallize in the hollows 
formed in their interior. 
440. Portion of a nodule of 
Argillaceous Ironstone, with 
Miilerite {Sulphide of Nickel) 
acicularly crystallized on quartz, 
in the cracks. 
Merthyr Tydfil. 
441 to 445. Nodules of Argil¬ 
laceous Ironstone. 
From Merthyr Tydfil, Glamorgan¬ 
shire, 
446 & 446a. Nodules of Argil¬ 
laceous Ironstone called ‘‘Penny 
jiieces.” 
South Wales. 
447 & 447a. Nodules of Argil¬ 
laceous Ironstone, from an 
“ underclay.” 
Aherdare, Glamorganshire. 
Shelf YI. 
448 & 448a. Nodules of Argil¬ 
laceous Ironstone. 
Ystradgunlas, Brecknockshire. 
449. Nodule of Argillaceous 
Ironstone. 
From the Coal Measure Shales, 
South Wales. 
450. Nodule of Argillaceous 
Ironstone. 
451 & 451a. Nodule of Argil¬ 
laceous Ironstone, broken ojien 
to show its concentrically coated 
structure. 
Merthyr Tydfil. 
452. Septarian nodule of Argil¬ 
laceous Ironstone, exhibiting 
the fissures extending to the sur¬ 
face. 
Ma esteg. Glam organsli ire. 
453. Nodule of Argillaceous 
Ironstone, containing Stigmaria 
Jicoides, the root of the fossil ^ikuit 
Sigillaria. 
From an under clay of the Coal 
Measures at Maesteg Iron 
Works, Bridgend, Glamorgan¬ 
shire. 
Presented by Mr. Bicheno. 
454. Argillaceous Ironstone, 
with organic remains, jirobably 
j worm tracks. 
j Coal Measures, South Wales. 
\ 454a. Argillaceous Iron- 
I STONE, with organic remains: 
Coal Pleasures, Stafi^ordshire. 
Shelf VII. 
455. Argillaceous Ironstone. 
From the Coal Measures at Black- 
well, Somerset, 
Argillaceous Ironstones, 
from the South Wales Coal-field, 
Mostly jiresented by S. H. Black- 
well, i851. 
South Wales.— Eastern Outcrop f 
Series from Blaenavon, Mon¬ 
mouthshire :— 
456. Bed called “ Black Pins.” 
457. Three - quarter Balls,” 
with Calcite crystallized in . the 
cracks. 
458. “ Meadow Vein Mine,” or 
“ Pwllaca.” 
459. “ Spotted Vein.” 
460. “ Bottom Vein Mine.” 
* See for illustration the Section of the Measures at Ebbw Vale, in the “Iron Ores 
of Great Britain,” p. 172, and the Vertical Sections of the Geological Survey, Sheet 8, 
