1912.] 



NOTES ON GEOLOGICAL RESULTS. 



379 



cretions are broken up. The shells are more numerous in the 

 clay and the concretions are smaller and the bands thinner. 

 The band of clay at Fermain appears to have suffered less 

 and the shells have escaped solution. 



The Fermain deposit studied alone would give a false 

 impression of the mode of formation, the slip having mixed 

 the various bands and rubble, but the bands of concretions, 

 in situ, at St. Martin's Point, give, I think, a clear idea of 

 the process. 



All along the coast the underlying rubble head has been 

 cemented into a solid breccia. This solid mass falls from 

 the cliffs and lies unbroken on the rocks below. 



Whatever the age of the concretions there is no possible 

 doubt that the clay deposit is old, for it is intermediate 

 between two bands of rubble head. 



I shall now quote a few authors so as to obtain an 

 idea of these formations. 



Beginning with our Transactions we find the concretions 

 described in the geological notes of former excursions. They 

 are spoken of by Dr. Andrew Dunlop, in a paper read before 

 our Society,f as occurring in Jersey. The paragraph con- 

 taining the reference appears to me to deal with more than 

 one deposit of clay, although the author speaks of one deposit 

 only ("The clay is generally unstratified," &c). The author 

 writes: "It (the clay) contains 'race' — fantastically shaped 

 concretions resembling the 6 Mannchen ' or 4 Puppchen ' of 

 the German Loess." Again : " The clay is generally unstra- 

 tified, but occasionally distinct bedding in fine layers is 

 observed." 



In Guernsey we have, so far, found the concretions 

 in the sea-eroded cliff. There is no statement in Dr. Dunlop's 

 paper as to their occurrence in inland clay or on the 

 coast only. Mr. Sinelt in a recent work draws attention 

 to these concretions in "diluvial clay" at La Motte, Jersey. 

 He, however, makes a definite statement which we may look 

 upon as filling the gap in Dr. Dunlop's paper, for he says : 

 " In the diluvial clay of La Motte there is an abundance 

 of the curious erratically shaped lime concretions known as 

 i Lossmanchen ' or 6 Losspuppen.' The concretions are formed 



around organic nuclei The presence of 



these lime concretions in the clay of La Motte, and in that 

 and no other part of the island^ has long proved a puzzle to 

 local geologists, but the recent discovery of the large burial 



* See folio 254, vol. 1898. t Transactions for 1898, fol. 218. 



I Geology of Jersey, fol. 2i. § The italics are mine.— A. C 



