274 
HUGHES : INGLEBOROUGH. 
When this hard water is collected in hollows and pans and 
tarns, sometimes it becomes supersaturated by evaporation and 
the lime is thrown down ; sometimes the process is aided by the 
action of chara and other lime-collecting plants ; sometimes 
fresh-water shells help to form the marl that is so commonly 
found in peaty hollows fed from the limestone hills. One of 
these lying on the old uneven Silurian floor in the middle of 
Crummack Dale offers an example of all these agencies combined. 
The following shells were identified in it by Mr. Hughes during 
one short visit : — 
Sphcerium corneum. 
S. pusillum. 
Planorhis nitidus. 
Limncea peregra. 
L. palustris. 
Valvata cristata. 
V. piscinalis. 
Succinea putris. 
Fossils of the Mountain Limestone. 
In the lowest limestone above the basement conglomerate 
fossils are not scarce. They are abundant in the cliff where the 
water comes out that crosses the Crummack road at its lowest 
part. ^Ir. Clapham has recently made an opening here in 
the weathered limestone just above the conglomerate, and 
fossils are easily procured from the broken rock. The following 
species are common : — 
Euomphalus pentangulatus. 
Bellerophon (of very large size). 
Chonetes comoides. 
Zaphrentis cornvxopice. 
Amplexus. 
Caninia cylindrica. 
L iihoslrotio n hasaliiforme. 
Michelinia megasioma. 
Syringopora. 
Producta Martini. 
Spirifera glabra. 
