340 
DURNFORD : DEEP BORING XEAR SELBY. 
South Car. The gypsum is most probably identical with the 
beds quarried at Hillam for the manufacture of plaster of Paris. 
At a depth of 820 feet the Magnesian Limestone was entered, 
which it is safe to assume is Permian in age. The Permian as 
proved at Barlow may be classed in three sub-divisions, viz. : — 
(1) The Upper Magnesian Limestone ; (2) Middle Marls ; and 
(3) Lower Magnesian Limestone. The Upper Limestone was 
a fairly consistent deposit some 90 feet thick, interspersed 
with an occasional thin band of gypsum. The Middle Marl 
Series was a little over 100 feet in thickness. In the middle 
of the series occurred a bed of rock salt 20 feet thick. This 
rock salt appears to be a local deposit, but if it were proved to 
be of any considerable extent it might possibly, in the future, 
form a valuable asset to the estate. The rest of the strata 
consisted of Red Marls, with an occasional layer of hmestone 
and a bed of anhydrite. The Lower Magnesian Limestone, 
occurring between 1,010 and 1,305 feet, was similar in character 
to the Upper Limestone. No fossils were discovered in the 
cores obtained from the Permian, though a few shells are to be 
found in the quarries at Garforth, where the Permian outcrops, 
e.g., Productus horridus and Bakevellia Sedgwickiana. 
At a depth of 1,305 feet the sudden transition from Permian 
to Carboniferous took place — lithologically from magnesian 
hmestone to grey shale. The strata proved below this depth 
consisted of typical Coal Measure shales and sandstones, the 
only unusual feature being the entire absence of workable coal 
seams. Without going into needless detail of each stratum, 
the writer will content himself with calling attention to points 
of special interest. At a depth of 1,500 feet a shaley band 
occurred containing numerous specimens of Pterinopecten papy- 
raceous and one or two goniatite impressions. Unfortunately 
the latter were not sufficiently well preserved to enable their 
species to be determined. This marine band was one foot in 
thickness, and overlay a bed of fire-clay. The bed of dark 
coloured shales at 1,600 feet contained concretionary ironstone, 
and at 1,615 feet a coal seam was met with 1 foot 3 inches in 
thickness. The coal did not form a core, but was brought 
up in the chip cup in a fragmental condition. The seat earth 
