156 
PARSONS : TRIAS OF THE VALE OF YORK. 
Hook Bridge, and Staddlethorpe ; but the only place in the 
south of Yorkshire where it is superficial is at Holme- on- 
Spalding Moor, where it rises into a detached hill 150 feet 
high. A subterranean ridge appears to extend eastwards 
from this hill towards the lias at North Cliff; the red marl 
is met with at a depth of 7 feet, in marl pits on Cliff 
Warren ; while in others, north and south of that, as those at 
Bealsbeck, described by the Rev. W. V. Harcourt, in the 
Philosophical Magazine, in 1829, a greater depth, 27 feet 
or more, was attained before meeting the red marl. 
All geological maps that I have seen err, following 
Phillips, in attributing a much too great superficial extension 
to the trias in this part of Yorkshire ; thus it is shown over 
a large tract in the East Riding, about Riccall, Howden, 
Staddlethorpe, and other places, where well-sinkings prove 
that it is covered up with some 50 feet of sand, laminated 
clay, &c. I believe that the bed of yellow sand, No. 4 in my 
previous paper, above the laminated clay, has been mistaken 
for the new red sandstone, — hence the error. 
I know no place nearer than Gainsborough where the 
passage of the Keuper into the lias is shown ; but it is very 
possible that the Rhoetic beds may some day be met with in 
well-sinkings, along the edge of the lias, between Market 
Weighton and Brough. In the cutting of the Great 
Northern Railway, between Gainsborough and Lee, an 
excellent section is exposed, showing the passage of the 
Keuper through the Rhoetic beds into the lower lias. The 
Rhoetic beds are represented by black shales, crowded in 
places with Avicula contorta, and I found one scale of 
Lepidotus. 
The junction of the Keuper with the Bunter is nowhere 
exposed superficially, but was met with at a depth of 342 feet 
in borings at Reedness* In my former paper I gave it as 
* See Section 3, Trans. Yorks. GeoL and Pol. Soc.for 1877, p. 231. 
