42 WILMORE : THE STRUCTURE OF SOME CRAVEN LIMESTONES. 
Fossils are fragmentary and occur mainly in the shale 
bands. There are abundant crinoid stems and plates. I found 
one stem with a perfect Pentagonal Section. A broken cup of 
? Platycrinus was found. Zaphrentis is common (Z. patula, 
Z. Phillipsi), Orthis Michelini, &c. (Plate V., Fig. E). 
A little further north we have good exposures at Skelda 
and Marton Scar. This is the only part of the district where 
the limestone forms scars. The strata strike X. and S. with 
a well-marked easterly dip, which varies slightly, on the whole 
diminishing as the strata are traced eastward. 
In an old quarry near Skelda Wood there is a fine exposure 
of strata, probably corresponding with those of Gledstone 
Kennels. 
The strata in the quarry are as follows : — 
36 feet solid limestone, with thin shale partings. 
1 foot shale. 
9 feet limestone. 
2 feet shales. 
9 inches limestone. 
6 inches shales. 
1 foot 3 inches limestone. 
1 foot 6 inches shales. 
3 feet limestone. 
Shales, base not seen. 
The dip is nearly due east, 20° to 24°. 
The shales with limestones are here succeeded bs^ this 
massive Umestone, which forms distinct scars. 
The shale beds are black, very friable, weathering grey 
and yellowish on the edges. They are packed full of fragments 
of Echinodermata — stems, plates, spines. I also found Zaphrentis 
sp., Euomphalus pugilis, and Orthis Michelini. Fragments of 
Productus pustulosus (?) were found. Also fragments of a small, 
irregular, ribbed bivalve are quite common in these and the 
Gledstone beds ; it is very suggestive of a small ostrea. The 
massive limestones are crinoidal and shelly. Productus pus- 
tulosus and other fragments were obtained. 
Following these strata eastwards a series of exposures may 
be seen on the scars. The dip remains about the same, until 
