128 
Ft. In. 
Coal... ... ... ... ... ... 1 o 
White Shale, with Thin Coal .. ... ... 90 0 
Coal... ... ... ... ... ... 0 6 
Arenaceous Shale ... ... ... ... 15 0 
Blue Shale, -with Ironstone ... ... ... 20 0 
Bone-bed ... ... ... ... ... i to f 
Better Bed Coal ... ... ... ... 1ft. 3in. to2 9 
Seat Earth or Galliard ... ... ... ... 4 0 
Shales and Kaggy. stone ... ... ... flO 0 
Elland Flag-rock, with Partings of Shale ... ... 300 0 
The beds vary very much in thickness, the above may 
be taken as the average in this district. The Bone-bed 
rests immediately on the surface of the coal, and varies 
from a quarter to five-eighths of an inch in thickness. Above 
is a thick bed of blue argillaceous shale, containing layers of 
ironstone nodules, the only organic remains found in it being 
those of plants. The Bone-bed is composed, in a great 
measure, of comminuted bones, principally of fishes, though 
remains of labyrinthodonts are sometimes found, mixed with 
these are minute fragments of coal, often in thin layers of 
small extent. The whole presents the appearance of a 
brownish-black argillaceous shale, and is easily distinguished 
from the light-bluish shale above. It is continuous over a 
large area, being invariably found, where the coal has been 
got, from the north-west of Wyke to Clifton. ISTearly all my 
specimens are from the latter district. 
Before enumerating the species of fossil fish from this 
bed, I would draw attention to the section, in order to point 
out the probable circumstances attending the aggregation 
and deposition of the strata composing it. Beginning with 
the Elland Flag-rock, we have a great thickness of sandstones 
with intercalations of shale, which were probably of littoral 
origin, or may have been the estuary of a river. A gradual 
elevation of the land then took place, which was in due time 
covered by the plant life, ultimately forming the Better Bed 
