256 MESSRS. R. H. RASTALL AND J. ROMANES ON [Aug. I909, 



(5) Kingston and Toft : 139 specimens. 



The rocks of the Scandinavian province are represented in this 

 district by one rhomb-porphyry from Toft and one nordmarkite, 

 together with three Sparagmites. There are five specimens of 

 porphyry oc, and no less than thirty-one boulders are referred to 

 lavas of the Old Eed Sandstone type. 



The most important discovery here is a small specimen from 

 Kingston Lodge, which appears to be identical in every respect 

 with the well-known muscovite-granite-porphyry of Dufton Pike, 

 in the Eden Valley near Appleby. Associated with this is a speci- 

 men of andesitic composition which much resembles some of the 

 rocks of the Borrowdale Series. In connexion with this occurrence 

 must also be taken into account the two specimens of apparent 

 Borrowdale lavas from Cambridge. These four specimens alone, if 

 rightly identified, and there is not much room for doubt in the case 

 of the porphyry at any rate, seem to go far to establish the occur- 

 rence of Lake District boulders in Cambridgeshire, a fact not yet 

 recognized. 



Among sedimentary rocks the most interesting are cellular 

 Magnesian Limestone and two examples of the silicified oolite 

 already mentioned. The miscellaneous igneous rocks include 

 10 pink granulites, 2 gabbros, 14 basalts with and without olivine, 

 13 dolerites, and a serpentine. Metamorphic rocks, especially 

 schists, are strongly represented. One of the most remarkable of 

 these is a rock which consists very largely of radiating bundles 

 of tourmaline-needles. It is probably a product of metasomatic 

 metamorphism, but no suggestion can be made as to its origin. 



Mr. Cowper Reed x has described an unusually large boulder at 

 "Wimpole Hall. Its weight was estimated at 3 tons. It is litho- 

 logically similar to the Spilsby Sandstone, and contains ammonites 

 allied to those recorded from that horizon. 



The outstanding features of the collection from this district 

 appear to be the abundance of basic igneous rocks and schists, and 

 the comparative rarity of Scandinavian plutonics. 



(6) Whittlesford, Pampisford, Hinxton, and Linton : 

 100 specimens. 



This area has yielded an extremely varied collection of boulders. 

 Scandinavian rocks are represented by five rhomb-porphyries, one 

 having been obtained from each of the following localities — 

 Hinxton, Barrington Hill, Whittlesford, and two from Pampisford. 

 One specimen (sliced) is a typical nordmarkite with arfvedsonite 

 and aegirine. Four specimens of porphyry x and one specimen 

 of the Forfarshire porphyry occur, together with one example 

 of the quartz-porphyry which we have mentioned as found in the 



1 Geol. Mag. 1898, p. 267. 



