402 A. J. JUKES-BROWNE ON THE HESSLE 
clay is seen; and it did not seem possible to draw any line of 
separation between them. 
Nevertheless it is a fact that the Boulder-clay underlying the 
marsh-land east of Burgh is of a marly and chalky nature, according 
to the accounts given by persons acquainted with it. At the brick- 
yard on the Skegness road, I was informed that below the marsh 
clays, at a depth of about 14 feet, they came to ‘“ greyish white 
clay with chalk stones,” into which they had dug 5 feet, but did 
not know how much deeper it extended. 
At Croft brickyard, nearly a mile and a half to the southward, it 
hes at a depth of 18 feet, and is described as ‘‘ yellowish marly 
clay with white chalk pebbles.” Nearer Burgh, at Mr. Bland’s 
farm, marly clay was met with in sinking the well at a depth of 
about 6 feet ; and passing through this they found gravel and sand 
below, obtaining a supply of water at 12 feet. 
This marly clay therefore can hardly be the great Chalky Boulder- 
clay of Mr. Searles Wood, but is probably a continuation of the 
clay seen in the gravel-pits between Burgh and Bratoft. When this 
is pumped clear of water the following section is exposed :— 
feet 
Soil and purplish “‘marl” or clay .............-2.0208- 3 to 6 
Sand with some stony layers ............eeececeeeecen eee 6 to 4 
Bed of gravel and stones, resting on a floor of marly 
clay similar to the topmost bed ...........sceesse0 3 to 2 
12 
From information obtained on the spot it would appear that the 
gravel and sand form a lenticular deposit in the Boulder-clay. 
Several large boulders of basalt were thrown out, and were said to 
have come from the upper clay. The stones in the gravel were mostly 
chalk and flint; but I noticed also pebbles of red chalk, Neocomian 
sandstone, quartzite, and shelly limestone. 
Mammalian bones are found in some abundance at the bottom of 
the gravel; and I have to thank Mr. Jabez Good, of Burgh, for trans- 
mitting those in his possession to Jermyn Street for examination. 
They were determined by Mr. EK. T. Newton to belong to Hlephas 
antiquus, Rhinoceros leptorhinus, and a Bos or Bison. 
At Bratoft another patch of sand comes to the surface, and the 
Boulder-clay around appears to vary much in thickness. At Irby, 
gravel has been dug from a similar patch; and between Irby and 
Firsby a small pit was opened in 1877, one face of which showed a 
somewhat confused section of grayel, sand, and Boulder-clay inter- 
bedded with one another; but the gravel passed under the clay in 
other parts of the pit. 
South of Irby and Firsby the Hessle beds sink under the clays 
and silts of the fen; but as the latter are nowhere very thick, the 
Boulder-clay is touched in several brickyards: thus about a mile 
8.S.E. of Irby marly Boulder-clay is found at a depth of 1043 feet ; 
its thickness here is not more than 10 feet; and there is sand beneath 
it from which a water-supply is obtained. 
