Notices of Memoirs — J. Rhodes — Phosphate-hearing Rocks. 39 



Hornblende, Biotite, Magnetite, Tourmaline, Spinel, and possibly 

 Sillimanite ; Calcite, Chlorite, and Epidote are often present, but 

 appear to be secondary after some of those mentioned. 



Many dykes penetrate the sandstones, and most of these are 

 undoubtedly apophyses of the Granite. They are mostly Diorite 

 Porphyrites or Quartz Diorite Porphyrites, which may contain 

 Biotite, Augite, Hornblende, or Hypersthene. Syenite Porphyries 

 also occur, and occasionally small veins of more acid character, 

 which may be considered coarse-grained Granophyres. In addition 

 to these there are several dykes of Olivine Dolerite and Andesitic 

 Basalt, but these are not known to be genetically connected with 

 the Gi'anite. 



ni. — Notes on the ocoukbencb of Phosphatio Nodules and 

 Phosphate-bearing Eock in the Upper Carboniferous Lime- 

 stone (Yoredale) Series of the West Riding of Yorkshire 

 and Westbioreland Border. By John Rhodes, of the Geological 

 Survey.^ 



BY kind permission of the British Association Committee on 

 Carboniferous Zones I am enabled to announce the discovery 

 of phosphatic nodules and of a rock having a phosphatic matrix in 

 the Yoredale rocks of the following localities : — 



Phosphatic Nodules : Far Cote Gill, JEast Slope of Swarth Fell, 



Westmoreland. 



These nodules occur along with ironstone septaria in blue shales 

 which rest on the top siliceous beds of the Underset Limestone. 

 The nodules are confined to the lower 5 feet of the shales, and are 

 more numerous in the lower half than in the upper half. 



In the same gill, and resting on the chert of the Little Limestone, 

 there is a layer, 3 inches in thickness, containing phosphatic nodules 

 embedded in a fine clayey matrix. It is sprinkled throughout with 

 glauconite grains and angular chips of quartz, and is overlain by 

 ironstone shales. 



At the same horizon as above, but 2J miles to the south-east, 

 there occurs in a gill that runs from Lambfold Crags to Lunds 

 Church, two miles west of north of Hawes Junction, a layer of rock 

 three inches in thickness, with a phosphatic matrix throughout. 

 This layer, which has a crust of brown iron-ore, is rich in glauconite 

 and quartz grains, and. also contains fragments of conodonts, etc. 



Phosphatic Nodules : Goodham Gill, East Slope of Swarth Fell, 

 2 miles north-west of Hawes Junction, Yorkshire. 

 The phosphatic nodules at this locality occur throughout a lime- 

 stone which varies in thickness from 3 to 6 inches. This layer is 

 underlain and overlain by shale in more or less rotten condition. 

 The horizon is doubtful, but it appears to be about 170 feet over 

 the Little Limestone. From the upper surface of the top bed of 

 the Crow Limestone, Cartmere Gill, East Baugh Fell, Grisdale, 



1 Eead before the British Association, Section C (Geology), Glasgow, Sept., 1901. 



