292 YORKSHIRE NATURALISTS’ UNION AT HAYBURN WYKE. 
The whole of the district comprised in the day’s investigations 
lies on the Lower Oolites, which are at this part of the coast very 
finely developed. Starting at the south end of the district and 
working up north, the various beds were clearly seen in descending 
order. At Hundale the basement beds of the Upper Estuarine 
series are met, and below comes the Scarborough or Grey Limestone 
series, which is the most important marine series of the Lower Oollites, 
consisting of a series of siliceous and calcareous bands with shaly 
partings, and having a considerable thickness of shale in the upper 
part, and whose massive sandstone base forms the fine reefs of 
ndale Scar. Typical fossils having been got, the party proceeded 
around the Wyke and examined the fine sections in the Middle 
Estuarine series which are there exposed. This is the principal coal- 
bearing horizon of the Lower Oolites, consisting generally of shales 
with bands of sandstone, containing abundance of plant-remains. 
An old drift or day-hole was noted in the cliff, where evidently the 
soft or Oolite jet had been worked from the outcrop. This series 
attains at this point a total thickness of over 103 ft., and is topped 
by an evenly-bedded, slightly calcareous massive sandstone, which, 
from the fossils found at its base, would seem to be a passage bed 
marking a gradual change from the marine to a freshwater condition. 
Continuing along the shore, noting in passing many enormous slips 
that had taken place in the cliffs, the party were soon busy clamber- 
ing up and slipping over enormous boulders that bestrewed the 
foreshore ; no nice sandy path could the fast-tiring geologist get to 
ease his aching limbs, while the high cliffs effectively shut out any 
chance of gaining the green carpeted summit. Slowly and heavily 
plodding along with thoughts of pity for any poor mariner who 
should by stress of weather be driven on such a rock-bound coast, 
where in times of storm the undercliff is washed with a seething 
mass of foam, the party reached the very fine section of the Mille- 
pore bed, when a refreshing halt was made to examine this interesting 
marine bed and regain breath. The rock here forms an important 
and extensive reef of massive and ferruginous sandstone, running 
out at low water into the sea, finely weathered,.and formed into 
a floor resembling huge flags with open joints, and in many instances 
recalling the deep-weathered joints of the carboniferous limestones 
about Ingleborough. Rising up in the cliff towards the north, this 
bed can be traced as far as Hayburn Wyke. Passing along further 
north, and still over the sharp and Seep boulders, to Iron Scar, 
the Eller Beck. bed was next examined. This band of marine 
formation, capping the estuarine se freshwater beds of the Lower 
Estuarine Series, consists of over 17 ft. of sandstones, ironstones, 
Naturalist, 
